Helical magnetic ordering in Sr(Co1-xNix)2As2

Wilde, John M.; Kreyssig, A.; Vaknin, D.; Sangeetha, N. S.; Li, Bing; Tian, Wei; Orth, Peter P.; Johnston, David C.; Ueland, B. G.; McQueeney, R. J.

doi:10.1103/PhysRevB.100.161113

Title: Helical magnetic ordering in $Sr {({Co}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$

Abstract

SrCo₂As₂ is a peculiar itinerant magnetic system that does not order magnetically, but inelastic neutron-scattering experiments observe the same stripe-type antiferromagnetic (AF) fluctuations found in many of the Fe-based superconductors along with evidence of magnetic frustration. Here we present results from neutron diffraction measurements on single crystals of Sr(Co_1-xNi_x)₂As₂ that show the development of long-range AF order with Ni doping. However, the AF order is not stripe type. Rather, the magnetic structure consists of ferromagnetically aligned (FM) layers (with moments laying in the layer) that are AF arranged along c with an incommensurate propagation vector of (0 0 τ), i.e., a helix. Using high-energy x-ray diffraction, we find no evidence for a temperature-induced structural phase transition that would indicate a collinear AF order. This finding supports a picture of competing FM and AF interactions within the square transition-metal layers due to flat-band magnetic instabilities. However, the composition dependence of the propagation vector suggests that far more subtle Fermi surface and orbital effects control the interlayer magnetic correlations.

Authors:

^[1]; Kreyssig, A. ^[1];

^[1]; Sangeetha, N. S. ^[1];

^[1];

^[2];

^[1]; Johnston, David C. ^[1];

^[1]; McQueeney, R. J. ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: 2019-10-29

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1606994

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 100; Journal Issue: 16; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Wilde, John M., Kreyssig, A., Vaknin, D., Sangeetha, N. S., Li, Bing, Tian, Wei, Orth, Peter P., Johnston, David C., Ueland, B. G., and McQueeney, R. J. Helical magnetic ordering in Sr(Co1-xNix)2As2.  United States: N. p., 2019. 
Web.  https://doi.org/10.1103/PhysRevB.100.161113.

Copy to clipboard


                    Wilde, John M., Kreyssig, A., Vaknin, D., Sangeetha, N. S., Li, Bing, Tian, Wei, Orth, Peter P., Johnston, David C., Ueland, B. G., & McQueeney, R. J. Helical magnetic ordering in Sr(Co1-xNix)2As2.  United States.  https://doi.org/10.1103/PhysRevB.100.161113

Copy to clipboard


                    Wilde, John M., Kreyssig, A., Vaknin, D., Sangeetha, N. S., Li, Bing, Tian, Wei, Orth, Peter P., Johnston, David C., Ueland, B. G., and McQueeney, R. J. Tue .  
"Helical magnetic ordering in Sr(Co1-xNix)2As2".  United States.  https://doi.org/10.1103/PhysRevB.100.161113.  https://www.osti.gov/servlets/purl/1606994.

Copy to clipboard


                    
@article{osti_1606994,

  title        = {Helical magnetic ordering in Sr(Co1-xNix)2As2},

  author       = {Wilde, John M. and Kreyssig, A. and Vaknin, D. and Sangeetha, N. S. and Li, Bing and Tian, Wei and Orth, Peter P. and Johnston, David C. and Ueland, B. G. and McQueeney, R. J.},

  abstractNote = {SrCo2As2 is a peculiar itinerant magnetic system that does not order magnetically, but inelastic neutron-scattering experiments observe the same stripe-type antiferromagnetic (AF) fluctuations found in many of the Fe-based superconductors along with evidence of magnetic frustration. Here we present results from neutron diffraction measurements on single crystals of Sr(Co1-xNix)2As2 that show the development of long-range AF order with Ni doping. However, the AF order is not stripe type. Rather, the magnetic structure consists of ferromagnetically aligned (FM) layers (with moments laying in the layer) that are AF arranged along c with an incommensurate propagation vector of (0 0 τ), i.e., a helix. Using high-energy x-ray diffraction, we find no evidence for a temperature-induced structural phase transition that would indicate a collinear AF order. This finding supports a picture of competing FM and AF interactions within the square transition-metal layers due to flat-band magnetic instabilities. However, the composition dependence of the propagation vector suggests that far more subtle Fermi surface and orbital effects control the interlayer magnetic correlations.},

  doi          = {10.1103/PhysRevB.100.161113},

  journal      = {Physical Review B},

  number       = 16,

  volume       = 100,

  place        = {United States},

  year         = {2019},

  month        = {10}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1103/PhysRevB.100.161113

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 2 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Crystallographic, electronic, thermal, and magnetic properties of single-crystal SrCo $_{2}$ As $_{2}$
journal, July 2013

Pandey, Abhishek; Quirinale, D. G.; Jayasekara, W.
Physical Review B, Vol. 88, Issue 1
DOI: 10.1103/PhysRevB.88.014526

Superconductivity at 23 K in Pt doped BaFe ₂ As ₂ single crystals
journal, February 2010

Saha, S. R.; Drye, T.; Kirshenbaum, K.
Journal of Physics: Condensed Matter, Vol. 22, Issue 7
DOI: 10.1088/0953-8984/22/7/072204

Suppression of magnetic order in ${CaCo}_{1.86} {As}_{2}$ with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of $Ca {({Co}_{1 - x} {Fe}_{x})}_{y} {As}_{2}$
journal, February 2017

Jayasekara, W. T.; Pandey, Abhishek; Kreyssig, A.
Physical Review B, Vol. 95, Issue 6
DOI: 10.1103/PhysRevB.95.064425

Ising and spin orders in the iron-based superconductors
journal, July 2008

Xu, Cenke; Müller, Markus; Sachdev, Subir
Physical Review B, Vol. 78, Issue 2
DOI: 10.1103/PhysRevB.78.020501

The Devil's staircase and harmless staircase. I. Oscillating interactions through elastic strains or other harmonic fields
journal, June 1980

Villain, J.; Gordon, M. B.
Journal of Physics C: Solid State Physics, Vol. 13, Issue 17
DOI: 10.1088/0022-3719/13/17/005

Anisotropic thermodynamic and transport properties of single-crystalline ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ ( $x = 0$ and 0.45)
journal, July 2008

Ni, N.; Bud’ko, S. L.; Kreyssig, A.
Physical Review B, Vol. 78, Issue 1
DOI: 10.1103/PhysRevB.78.014507

Ferromagnetic behavior induced by La-doping in SrCo ₂ As ₂
journal, January 2018

Shen, Shijie; Feng, Shangshen; Lin, Zhiping
Journal of Materials Chemistry C, Vol. 6, Issue 30
DOI: 10.1039/C8TC02503G

Strong Correlations and Magnetic Frustration in the High $T_{c}$ Iron Pnictides
journal, August 2008

Si, Qimiao; Abrahams, Elihu
Physical Review Letters, Vol. 101, Issue 7
DOI: 10.1103/PhysRevLett.101.076401

Magnetic Susceptibility of Collinear and Noncollinear Heisenberg Antiferromagnets
journal, August 2012

Johnston, D. C.
Physical Review Letters, Vol. 109, Issue 7
DOI: 10.1103/PhysRevLett.109.077201

Stabilization of an ambient-pressure collapsed tetragonal phase in CaFe $_{2}$ As $_{2}$ and tuning of the orthorhombic-antiferromagnetic transition temperature by over 70 K via control of nanoscale precipitates
journal, April 2011

Ran, S.; Bud’ko, S. L.; Pratt, D. K.
Physical Review B, Vol. 83, Issue 14
DOI: 10.1103/PhysRevB.83.144517

Consistent model of magnetism in ferropnictides
journal, March 2011

Wysocki, Aleksander L.; Belashchenko, Kirill D.; Antropov, Vladimir P.
Nature Physics, Vol. 7, Issue 6
DOI: 10.1038/nphys1933

Decoupling of the superconducting and magnetic/structural phase transitions in electron-doped ${BaFe}_{2} {As}_{2}$
journal, August 2009

Canfield, P. C.; Bud’ko, S. L.; Ni, Ni
Physical Review B, Vol. 80, Issue 6
DOI: 10.1103/PhysRevB.80.060501

Effect of magnetic frustration on nematicity and superconductivity in iron chalcogenides
journal, August 2015

Glasbrenner, J. K.; Mazin, I. I.; Jeschke, Harald O.
Nature Physics, Vol. 11, Issue 11
DOI: 10.1038/nphys3434

Infinitely Many Commensurate Phases in a Simple Ising Model
journal, June 1980

Fisher, Michael E.; Selke, Walter
Physical Review Letters, Vol. 44, Issue 23
DOI: 10.1103/PhysRevLett.44.1502

Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in ${SrCo}_{2} {As}_{2}$
journal, March 2019

Li, Yu; Yin, Zhiping; Liu, Zhonghao
Physical Review Letters, Vol. 122, Issue 11
DOI: 10.1103/PhysRevLett.122.117204

Pressure-induced volume-collapsed tetragonal phase of ${CaFe}_{2} {As}_{2}$ as seen via neutron scattering
journal, November 2008

Kreyssig, A.; Green, M. A.; Lee, Y.
Physical Review B, Vol. 78, Issue 18
DOI: 10.1103/PhysRevB.78.184517

Superconductivity and phase diagrams of the $4 d$ - and $5 d$ -metal-doped iron arsenides ${SrFe}_{2 - x} M_{x} {As}_{2}$ $(M = Rh, Ir, Pd)$
journal, July 2009

Han, Fei; Zhu, Xiyu; Cheng, Peng
Physical Review B, Vol. 80, Issue 2
DOI: 10.1103/PhysRevB.80.024506

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
journal, September 2011

Yin, Z. P.; Haule, K.; Kotliar, G.
Nature Materials, Vol. 10, Issue 12
DOI: 10.1038/nmat3120

Structural collapse and superconductivity in rare-earth-doped CaFe $_{2}$ As $_{2}$
journal, January 2012

Saha, S. R.; Butch, N. P.; Drye, T.
Physical Review B, Vol. 85, Issue 2
DOI: 10.1103/PhysRevB.85.024525

Flat-band magnetism and helical magnetic order in Ni-doped ${SrCo}_{2} {As}_{2}$
journal, September 2019

Li, Yu; Liu, Zhonghao; Xu, Zhuang
Physical Review B, Vol. 100, Issue 9
DOI: 10.1103/PhysRevB.100.094446

Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in $Sr {({Co}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$ single crystals
journal, September 2019

Sangeetha, N. S.; Wang, L. -L.; Smirnov, A. V.
Physical Review B, Vol. 100, Issue 9
DOI: 10.1103/PhysRevB.100.094447

Unified molecular field theory for collinear and noncollinear Heisenberg antiferromagnets
journal, February 2015

Johnston, David C.
Physical Review B, Vol. 91, Issue 6
DOI: 10.1103/PhysRevB.91.064427

Magnetic properties and Mott transition in the square-lattice Hubbard model with frustration
journal, August 2013

Yamada, A.; Seki, K.; Eder, R.
Physical Review B, Vol. 88, Issue 7
DOI: 10.1103/PhysRevB.88.075114

Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet ${Ca}_{1 - x} {Sr}_{x} {Co}_{2 - y} {As}_{2}$
journal, December 2017

Sangeetha, N. S.; Smetana, V.; Mudring, A. -V.
Physical Review Letters, Vol. 119, Issue 25
DOI: 10.1103/PhysRevLett.119.257203

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe ₂ As ₂
journal, August 2010

Canfield, Paul C.; Bud'ko, Sergey L.
Annual Review of Condensed Matter Physics, Vol. 1, Issue 1
DOI: 10.1146/annurev-conmatphys-070909-104041

Phase diagrams of $Ba {({Fe}_{1 - x} M_{x})}_{2} {As}_{2}$ single crystals ( $M = Rh$ and Pd)
journal, July 2009

Ni, N.; Thaler, A.; Kracher, A.
Physical Review B, Vol. 80, Issue 2
DOI: 10.1103/PhysRevB.80.024511

Crystal and magnetic structure of CaCo $_{1.86}$ As $_{2}$ studied by x-ray and neutron diffraction
journal, November 2013

Quirinale, D. G.; Anand, V. K.; Kim, M. G.
Physical Review B, Vol. 88, Issue 17
DOI: 10.1103/PhysRevB.88.174420

Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in ${Ca}_{1 - x} {Sr}_{x} {Co}_{2 - y} {As}_{2}$
journal, July 2019

Li, Bing; Sizyuk, Y.; Sangeetha, N. S.
Physical Review B, Vol. 100, Issue 2
DOI: 10.1103/PhysRevB.100.024415

Making and Breaking Bonds in the Solid State: The ThCr ₂ Si ₂ Structure
journal, September 1985

Hoffmann, Roald; Zheng, Chong
The Journal of Physical Chemistry, Vol. 89, Issue 20
DOI: 10.1021/j100266a007

High-temperature superconductivity in iron-based materials
journal, August 2010

Paglione, Johnpierre; Greene, Richard L.
Nature Physics, Vol. 6, Issue 9
DOI: 10.1038/nphys1759

Superconductivity in iron compounds
journal, December 2011

Stewart, G. R.
Reviews of Modern Physics, Vol. 83, Issue 4
DOI: 10.1103/RevModPhys.83.1589

Crystallographic phase transition within the magnetically ordered state of ${Ce}_{2} {Fe}_{17}$
journal, August 2007

Kreyssig, A.; Chang, S.; Janssen, Y.
Physical Review B, Vol. 76, Issue 5
DOI: 10.1103/PhysRevB.76.054421

Lattice collapse and quenching of magnetism in ${CaFe}_{2} {As}_{2}$ under pressure: A single-crystal neutron and x-ray diffraction investigation
journal, January 2009

Goldman, A. I.; Kreyssig, A.; Prokeš, K.
Physical Review B, Vol. 79, Issue 2
DOI: 10.1103/PhysRevB.79.024513

Superconductivity at 22 K in Co-Doped ${BaFe}_{2} {As}_{2}$ Crystals
journal, September 2008

Sefat, Athena S.; Jin, Rongying; McGuire, Michael A.
Physical Review Letters, Vol. 101, Issue 11
DOI: 10.1103/PhysRevLett.101.117004

Stripe Antiferromagnetic Spin Fluctuations in ${SrCo}_{2} {As}_{2}$
journal, October 2013

Jayasekara, W.; Lee, Y.; Pandey, Abhishek
Physical Review Letters, Vol. 111, Issue 15
DOI: 10.1103/PhysRevLett.111.157001

Preemptive nematic order, pseudogap, and orbital order in the iron pnictides
journal, January 2012

Fernandes, R. M.; Chubukov, A. V.; Knolle, J.
Physical Review B, Vol. 85, Issue 2
DOI: 10.1103/PhysRevB.85.024534

Electronic structure and spin dynamics of $A C o_{2} A s_{2} (A = Ba, Sr, Ca)$
journal, September 2018

Mao, Huican; Yin, Zhiping
Physical Review B, Vol. 98, Issue 11
DOI: 10.1103/PhysRevB.98.115128

Ising model with solitons, phasons, and "the devil's staircase"
journal, June 1980

Bak, Per; von Boehm, J.
Physical Review B, Vol. 21, Issue 11
DOI: 10.1103/PhysRevB.21.5297

Superconductivity induced by Ni doping in BaFe ₂ As ₂ single crystals
journal, February 2009

Li, L. J.; Luo, Y. K.; Wang, Q. B.
New Journal of Physics, Vol. 11, Issue 2
DOI: 10.1088/1367-2630/11/2/025008

Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet ${CaCo}_{2 - y} {As}_{2}$
journal, October 2017

Sapkota, A.; Ueland, B. G.; Anand, V. K.
Physical Review Letters, Vol. 119, Issue 14
DOI: 10.1103/PhysRevLett.119.147201

Competing magnetic phases and itinerant magnetic frustration in ${SrCo}_{2} {As}_{2}$
journal, August 2019

Li, Bing; Ueland, B. G.; Jayasekara, W. T.
Physical Review B, Vol. 100, Issue 5
DOI: 10.1103/PhysRevB.100.054411

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
journal, October 2010

Johnston, David C.
Advances in Physics, Vol. 59, Issue 6
DOI: 10.1080/00018732.2010.513480

Similar Records in DOE PAGES and OSTI.GOV collections:

Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in $Sr {({Co}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$ single crystals

Journal Article Sangeetha, N. S. ; Wang, L. -L. ; Smirnov, A. V. ; ... - Physical Review B

The compound SrCo₂As₂ with the body-centered tetragonal ThCr₂Si₂ structure is known to remain paramagnetic down to a temperature T = 0.05 K, but inelastic neutron scattering studies have shown that both ferromagnetic (FM) and antiferromagnetic (AFM) fluctuations occur in single crystals. Thus it is of interest to study how the magnetism evolves on doping SrCo₂As₂. Previous work on polycrystalline samples of Sr (Co_1-x Ni_x)₂ As₂ indicated the development of AFM order for 0 < x ≲ 0.3. Here we studied single crystals of Sr(Co_1-x Ni_x)₂ As₂ for 0 < x ≤ 1 and confirmed the occurrence of AFM order whichmore »« less
Cited by 4
https://doi.org/10.1103/PhysRevB.100.094447

Full Text Available
Competing magnetic phases and itinerant magnetic frustration in ${SrCo}_{2} {As}_{2}$

Journal Article Li, Bing ; Ueland, B. G. ; Jayasekara, W. T. ; ... - Physical Review B

Wmore »« less
Cited by 3
https://doi.org/10.1103/PhysRevB.100.054411

Full Text Available
Antiferromagnetic order in ${CaK (Fe}_{1 - x} {Ni}_{x})_{4} {As}_{4}$ and its interplay with superconductivity

Journal Article Kreyssig, A. ; Wilde, John M. ; Bohmer, A. E. ; ... - Physical Review B

The magnetic order in CaK(Fe_1–xNi_x)₄As₄ (1144) single crystals (x = 0.051 and 0.033) has been studied by neutron diffraction. We observe magnetic Bragg peaks associated with the same propagation vectors as found for the collinear stripe antiferromagnetic (AFM) order in the related BaFe₂As₂ (122) compound. The AFM state in 1144 preserves tetragonal symmetry and only a commensurate, noncollinear structure with a hedgehog spin-vortex crystal (SVC) arrangement in the Fe plane and simple AFM stacking along the c direction is consistent with our observations. The SVC order is promoted by the reduced symmetry in the FeAs layer in the 1144 structure.more »« less
Cited by 15
https://doi.org/10.1103/PhysRevB.97.224521

Full Text Available
Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in ${Ca}_{1 - x} {Sr}_{x} {Co}_{2 - y} {As}_{2}$

Journal Article Li, Bing ; Sizyuk, Y. ; Sangeetha, N. S. ; ... - Physical Review B

In semore »« less
Cited by 5
https://doi.org/10.1103/PhysRevB.100.024415

Full Text Available
Uniaxial pressure effect on the magnetic ordered moment and transition temperatures in ${BaFe}_{2 - x} T_{x} {As}_{2}$ ( $T = Co, Ni$ )

Journal Article Tam, David W. ; Song, Yu ; Man, Haoran ; ... - Physical Review B

In this paper, we use neutron diffraction and muon spin relaxation to study the effect of in-plane uniaxial pressure on the antiferromagnetic (AF) orthorhombic phase in BaFe₂As₂ and its Co- and Ni-substituted members near optimal superconductivity. In the low-temperature AF ordered state, uniaxial pressure necessary to detwin the orthorhombic crystals also increases the magnetic ordered moment, reaching an 11% increase under 40 MPa for BaFe_1.9Co_0.1As₂, and a 15% increase for BaFe_1.915Ni_0.085As₂. We also observe an increase of the AF ordering temperature (T_N) of about 0.25 K/MPa in all compounds, consistent with density functional theory calculations that reveal better Fermi surfacemore »« less
https://doi.org/10.1103/PhysRevB.95.060505

Full Text Available

Similar Records

Title: Helical magnetic ordering in Sr ( Co 1 - x Ni x ) 2 As 2

Abstract

Citation Formats

Crystallographic, electronic, thermal, and magnetic properties of single-crystal SrCo 2 As 2 journal, July 2013

Superconductivity at 23 K in Pt doped BaFe 2 As 2 single crystals journal, February 2010

Suppression of magnetic order in CaCo 1.86 As 2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca ( Co 1 − x Fe x ) y As 2 journal, February 2017

Ising and spin orders in the iron-based superconductors journal, July 2008

The Devil's staircase and harmless staircase. I. Oscillating interactions through elastic strains or other harmonic fields journal, June 1980

Anisotropic thermodynamic and transport properties of single-crystalline Ba 1 − x K x Fe 2 As 2 ( x = 0 and 0.45) journal, July 2008

Ferromagnetic behavior induced by La-doping in SrCo 2 As 2 journal, January 2018

Strong Correlations and Magnetic Frustration in the High T c Iron Pnictides journal, August 2008

Magnetic Susceptibility of Collinear and Noncollinear Heisenberg Antiferromagnets journal, August 2012

Stabilization of an ambient-pressure collapsed tetragonal phase in CaFe 2 As 2 and tuning of the orthorhombic-antiferromagnetic transition temperature by over 70 K via control of nanoscale precipitates journal, April 2011

Consistent model of magnetism in ferropnictides journal, March 2011

Decoupling of the superconducting and magnetic/structural phase transitions in electron-doped BaFe 2 As 2 journal, August 2009

Effect of magnetic frustration on nematicity and superconductivity in iron chalcogenides journal, August 2015

Infinitely Many Commensurate Phases in a Simple Ising Model journal, June 1980

Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo 2 As 2 journal, March 2019

Pressure-induced volume-collapsed tetragonal phase of CaFe 2 As 2 as seen via neutron scattering journal, November 2008

Superconductivity and phase diagrams of the 4 d - and 5 d -metal-doped iron arsenides SrFe 2 − x M x As 2 ( M = Rh , Ir , Pd ) journal, July 2009

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides journal, September 2011

Structural collapse and superconductivity in rare-earth-doped CaFe 2 As 2 journal, January 2012

Flat-band magnetism and helical magnetic order in Ni-doped SrCo 2 As 2 journal, September 2019

Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr ( Co 1 − x Ni x ) 2 As 2 single crystals journal, September 2019

Unified molecular field theory for collinear and noncollinear Heisenberg antiferromagnets journal, February 2015

Magnetic properties and Mott transition in the square-lattice Hubbard model with frustration journal, August 2013

Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet Ca 1 − x Sr x Co 2 − y As 2 journal, December 2017

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe 2 As 2 journal, August 2010

Phase diagrams of Ba ( Fe 1 − x M x ) 2 As 2 single crystals ( M = Rh and Pd) journal, July 2009

Crystal and magnetic structure of CaCo 1.86 As 2 studied by x-ray and neutron diffraction journal, November 2013

Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in Ca 1 − x Sr x Co 2 − y As 2 journal, July 2019

Making and Breaking Bonds in the Solid State: The ThCr 2 Si 2 Structure journal, September 1985

High-temperature superconductivity in iron-based materials journal, August 2010

Superconductivity in iron compounds journal, December 2011

Crystallographic phase transition within the magnetically ordered state of Ce 2 Fe 17 journal, August 2007

Lattice collapse and quenching of magnetism in CaFe 2 As 2 under pressure: A single-crystal neutron and x-ray diffraction investigation journal, January 2009

Superconductivity at 22 K in Co-Doped BaFe 2 As 2 Crystals journal, September 2008

Stripe Antiferromagnetic Spin Fluctuations in SrCo 2 As 2 journal, October 2013

Preemptive nematic order, pseudogap, and orbital order in the iron pnictides journal, January 2012

Electronic structure and spin dynamics of A C o 2 A s 2 ( A = Ba , Sr , Ca ) journal, September 2018

Ising model with solitons, phasons, and "the devil's staircase" journal, June 1980

Superconductivity induced by Ni doping in BaFe 2 As 2 single crystals journal, February 2009

Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet CaCo 2 − y As 2 journal, October 2017

Competing magnetic phases and itinerant magnetic frustration in SrCo 2 As 2 journal, August 2019

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides journal, October 2010

Title: Helical magnetic ordering in $Sr {({Co}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$

Crystallographic, electronic, thermal, and magnetic properties of single-crystal SrCo $_{2}$ As $_{2}$
journal, July 2013

Superconductivity at 23 K in Pt doped BaFe ₂ As ₂ single crystals
journal, February 2010

Suppression of magnetic order in ${CaCo}_{1.86} {As}_{2}$ with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of $Ca {({Co}_{1 - x} {Fe}_{x})}_{y} {As}_{2}$
journal, February 2017

Ising and spin orders in the iron-based superconductors
journal, July 2008

The Devil's staircase and harmless staircase. I. Oscillating interactions through elastic strains or other harmonic fields
journal, June 1980

Anisotropic thermodynamic and transport properties of single-crystalline ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ ( $x = 0$ and 0.45)
journal, July 2008

Ferromagnetic behavior induced by La-doping in SrCo ₂ As ₂
journal, January 2018

Strong Correlations and Magnetic Frustration in the High $T_{c}$ Iron Pnictides
journal, August 2008

Magnetic Susceptibility of Collinear and Noncollinear Heisenberg Antiferromagnets
journal, August 2012

Stabilization of an ambient-pressure collapsed tetragonal phase in CaFe $_{2}$ As $_{2}$ and tuning of the orthorhombic-antiferromagnetic transition temperature by over 70 K via control of nanoscale precipitates
journal, April 2011

Consistent model of magnetism in ferropnictides
journal, March 2011

Decoupling of the superconducting and magnetic/structural phase transitions in electron-doped ${BaFe}_{2} {As}_{2}$
journal, August 2009

Effect of magnetic frustration on nematicity and superconductivity in iron chalcogenides
journal, August 2015

Infinitely Many Commensurate Phases in a Simple Ising Model
journal, June 1980

Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in ${SrCo}_{2} {As}_{2}$
journal, March 2019

Pressure-induced volume-collapsed tetragonal phase of ${CaFe}_{2} {As}_{2}$ as seen via neutron scattering
journal, November 2008

Superconductivity and phase diagrams of the $4 d$ - and $5 d$ -metal-doped iron arsenides ${SrFe}_{2 - x} M_{x} {As}_{2}$ $(M = Rh, Ir, Pd)$
journal, July 2009

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
journal, September 2011

Structural collapse and superconductivity in rare-earth-doped CaFe $_{2}$ As $_{2}$
journal, January 2012

Flat-band magnetism and helical magnetic order in Ni-doped ${SrCo}_{2} {As}_{2}$
journal, September 2019

Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in $Sr {({Co}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$ single crystals
journal, September 2019

Unified molecular field theory for collinear and noncollinear Heisenberg antiferromagnets
journal, February 2015

Magnetic properties and Mott transition in the square-lattice Hubbard model with frustration
journal, August 2013

Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet ${Ca}_{1 - x} {Sr}_{x} {Co}_{2 - y} {As}_{2}$
journal, December 2017

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe ₂ As ₂
journal, August 2010

Phase diagrams of $Ba {({Fe}_{1 - x} M_{x})}_{2} {As}_{2}$ single crystals ( $M = Rh$ and Pd)
journal, July 2009

Crystal and magnetic structure of CaCo $_{1.86}$ As $_{2}$ studied by x-ray and neutron diffraction
journal, November 2013

Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in ${Ca}_{1 - x} {Sr}_{x} {Co}_{2 - y} {As}_{2}$
journal, July 2019

Making and Breaking Bonds in the Solid State: The ThCr ₂ Si ₂ Structure
journal, September 1985

High-temperature superconductivity in iron-based materials
journal, August 2010

Superconductivity in iron compounds
journal, December 2011

Crystallographic phase transition within the magnetically ordered state of ${Ce}_{2} {Fe}_{17}$
journal, August 2007

Lattice collapse and quenching of magnetism in ${CaFe}_{2} {As}_{2}$ under pressure: A single-crystal neutron and x-ray diffraction investigation
journal, January 2009

Superconductivity at 22 K in Co-Doped ${BaFe}_{2} {As}_{2}$ Crystals
journal, September 2008

Stripe Antiferromagnetic Spin Fluctuations in ${SrCo}_{2} {As}_{2}$
journal, October 2013

Preemptive nematic order, pseudogap, and orbital order in the iron pnictides
journal, January 2012

Electronic structure and spin dynamics of $A C o_{2} A s_{2} (A = Ba, Sr, Ca)$
journal, September 2018

Ising model with solitons, phasons, and "the devil's staircase"
journal, June 1980

Superconductivity induced by Ni doping in BaFe ₂ As ₂ single crystals
journal, February 2009

Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet ${CaCo}_{2 - y} {As}_{2}$
journal, October 2017

Competing magnetic phases and itinerant magnetic frustration in ${SrCo}_{2} {As}_{2}$
journal, August 2019

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
journal, October 2010