Helical antiferromagnetic ordering in EuNi1.95As2 single crystals

Sangeetha, N. S.; Smetana, V.; Mudring, A. -V.; Johnston, D. C.

doi:10.1103/PhysRevB.100.094438

Title: Helical antiferromagnetic ordering in EuNi_1.95As₂ single crystals

Abstract

The Eu^{+ 2} spins-7/2 in EuNi₂ As₂ with the body-centered tetragonal ThCr₂ Si₂ structure order antiferromagnetically below the Néel temperature T_N = 15 K into a helical antiferromagnetic (AFM) structure with the helix axis aligned along the tetragonal c axis and the Eu ordered moments aligned ferromagnetically within the ab plane as previously reported from neutron diffraction measurements [T. Jin et al., Phys. Rev. B 99, 014425 (2019)]. Here we study the crystallographic, magnetic, thermal, and electronic transport properties of Bi-flux-grown single crystals using single-crystal x-ray diffraction, anisotropic magnetic susceptibility χ, isothermal magnetization M, heat capacity Cp, and electrical resistivity ρ measurements versus applied magnetic field H and temperature T. Vacancies are found on the Ni sites corresponding to the composition EuNi_{1.95 (1)} As 2. A good fit of the ρ (T) data by the Bloch-Grüneisen theory for metals was obtained. The _χab (T) data below T_N are fitted well by molecular field theory (MFT), and the helix turn angle kd and the Eu-Eu Heisenberg exchange constants are extracted from the fit parameters. The kd value is in good agreement with the neutron-diffraction result. The magnetic contribution to the zero-field heat capacity below T_N is also fitted by MFT. Themore »« less

Authors:

Sangeetha, N. S. ^[1];

^[2]; Mudring, A. -V. ^[2];

^[3]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Stockholm Univ. (Sweden)
Ames Lab., and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

Publication Date:: Mon Sep 23 00:00:00 EDT 2019

Research Org.:: Ames Lab., Ames, IA (United States)

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

OSTI Identifier:: 1570835

Report Number(s):: IS-J-10052
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US2100039

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 100; Journal Issue: 9; 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


                    Sangeetha, N. S., Smetana, V., Mudring, A. -V., and Johnston, D. C. Helical antiferromagnetic ordering in EuNi1.95As2 single crystals.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevB.100.094438.

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                    Sangeetha, N. S., Smetana, V., Mudring, A. -V., & Johnston, D. C. Helical antiferromagnetic ordering in EuNi1.95As2 single crystals.  United States.  https://doi.org/10.1103/PhysRevB.100.094438

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                    Sangeetha, N. S., Smetana, V., Mudring, A. -V., and Johnston, D. C. Mon .  
"Helical antiferromagnetic ordering in EuNi1.95As2 single crystals".  United States.  https://doi.org/10.1103/PhysRevB.100.094438.  https://www.osti.gov/servlets/purl/1570835.

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@article{osti_1570835,

  title        = {Helical antiferromagnetic ordering in EuNi1.95As2 single crystals},

  author       = {Sangeetha, N. S. and Smetana, V. and Mudring, A. -V. and Johnston, D. C.},

  abstractNote = {The Eu+ 2 spins-7/2 in EuNi2 As2 with the body-centered tetragonal ThCr2 Si2 structure order antiferromagnetically below the Néel temperature TN = 15 K into a helical antiferromagnetic (AFM) structure with the helix axis aligned along the tetragonal c axis and the Eu ordered moments aligned ferromagnetically within the ab plane as previously reported from neutron diffraction measurements [T. Jin et al., Phys. Rev. B 99, 014425 (2019)]. Here we study the crystallographic, magnetic, thermal, and electronic transport properties of Bi-flux-grown single crystals using single-crystal x-ray diffraction, anisotropic magnetic susceptibility χ, isothermal magnetization M, heat capacity Cp, and electrical resistivity ρ measurements versus applied magnetic field H and temperature T. Vacancies are found on the Ni sites corresponding to the composition EuNi1.95 (1) As 2. A good fit of the ρ (T) data by the Bloch-Grüneisen theory for metals was obtained. The χab (T) data below TN are fitted well by molecular field theory (MFT), and the helix turn angle kd and the Eu-Eu Heisenberg exchange constants are extracted from the fit parameters. The kd value is in good agreement with the neutron-diffraction result. The magnetic contribution to the zero-field heat capacity below TN is also fitted by MFT. The isothermal in-plane magnetization Mab exhibits two metamagnetic transitions versus H, whereas Mc (T = 2 K ) is nearly linear up to H = 14 T, both behaviors being consistent with MFT. The Mc (H, T) , ρ(Hc, T) , and Cp (H c , T) data yielded a Hc- T phase diagram separating the AFM and paramagnetic phases in good agreement with MFT. Anisotropic χ(T) literature data for the ThCr 2 Si2 -type helical antiferromagnet EuRh2 As2 were also fitted well by MFT. A comparison is made between the crystallographic and magnetic properties of ThCr2 Si2-type Eu M2 Pn2 compounds with M = Fe , Co, Ni, Cu, or Rh, and Pn = P or As, where only ferromagnetic and c -axis helical AFM structures are found.},

  doi          = {10.1103/PhysRevB.100.094438},

  journal      = {Physical Review B},

  number       = 9,

  volume       = 100,

  place        = {United States},

  year         = {Mon Sep 23 00:00:00 EDT 2019},

  month        = {Mon Sep 23 00:00:00 EDT 2019}

}

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EuCo₂P₂: A Model Molecular-Field Helical Heisenberg Antiferromagnet

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The metallic compound EuCo₂P₂ with the body-centered tetragonal ThCr₂Si₂ structure containing Eu spins-7/2 was previously shown from single-crystal neutron diffraction measurements to exhibit a helical antiferromagnetic (AFM) structure below T_N=66.5 K with the helix axis along the c axis and with the ordered moments aligned within the ab plane. Here we report crystallography, electrical resistivity, heat capacity, magnetization, and magnetic susceptibility measurements on single crystals of this compound. We demonstrate that EuCo₂P₂ is a model molecular-field helical Heisenberg antiferromagnet from comparisons of the anisotropic magnetic susceptibility χ, high-field magnetization, and magnetic heat capacity of EuCo₂P₂ single crystals at temperature T≤TNmore »« less
Cited by 29
https://doi.org/10.1103/PhysRevB.94.014422

Full Text Available
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 17
https://doi.org/10.1103/PhysRevB.100.094447

Full Text Available
Magnetic, thermal, and electronic-transport properties of EuMg₂Bi₂ single crystals

Journal Article Pakhira, Santanu ; Tanatar, M. A. ; Johnston, D. C. - Physical Review B

Tmore »« less
Cited by 19
https://doi.org/10.1103/PhysRevB.101.214407

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Antiferromagnetism in EuCu₂As₂ and EuCu_1.82Sb₂ single crystals

Journal Article Anand, V. K. ; Johnston, D. C. - Physical Review. B, Condensed Matter and Materials Physics

Single crystals of EuCu₂As₂ and EuCu₂Sb₂ were grown from CuAs and CuSb self-flux, respectively. The crystallographic, magnetic, thermal, and electronic transport properties of the single crystals were investigated by room-temperature x-ray diffraction (XRD), magnetic susceptibility χ versus temperature T, isothermal magnetization M versus magnetic field H, specific heat C_p(T), and electrical resistivity ρ(T) measurements. EuCu₂As₂ crystallizes in the body-centered tetragonal ThCr₂Si₂-type structure (space group I4/mmm), whereas EuCu₂Sb₂ crystallizes in the related primitive tetragonal CaBe₂Ge₂-type structure (space group P4/nmm). The energy-dispersive x-ray spectroscopy and XRD data for the EuCu₂Sb₂ crystals showed the presence of vacancies on the Cu sites, yielding themore »« less
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https://doi.org/10.1103/PhysRevB.91.184403

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Title: Helical antiferromagnetic ordering in EuNi1.95As2 single crystals

Abstract

Citation Formats

The first order phase transition and superconductivity in BaNi 2 As 2 single crystals journal, August 2008

Superconductivity and local-moment magnetism in Eu ( Fe 0.89 Co 0.11 ) 2 As 2 journal, November 2009

Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo 2 − y As 2 journal, April 2018

EuCo 2 P 2 : A model molecular-field helical Heisenberg antiferromagnet journal, July 2016

Mössbauer and magnetic susceptibility investigations of strontium, lanthanum and europium transition metal phosphides with ThCr2Si2 type structure journal, January 1988

Magnetic dipole interactions in crystals journal, January 2016

EuFe 2 As 2 under High Pressure: An Antiferromagnetic Bulk Superconductor journal, August 2009

Lanthanoid and uranium nickel arsenides with CaBe2Ge2- and ThCr2Si2-type structures journal, February 1988

Low-temperature heat capacity of antiferromagnetic ternary rare-earth iron silicides M 2 Fe 3 Si 5 journal, September 1983

Comparison of silver and molybdenum microfocus X-ray sources for single-crystal structure determination journal, January 2015

Spiral magnetic ordering of the Eu moments in EuNi 2 As 2 journal, January 2019

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

Magnetic structure and magnetization of z -axis helical Heisenberg antiferromagnets with XY anisotropy in high magnetic fields transverse to the helix axis at zero temperature journal, June 2019

Europium-based iron pnictides: a unique laboratory for magnetism, superconductivity and structural effects journal, November 2016

Structural and magnetic phase transitions in the ternary iron arsenides SrFe 2 As 2 and EuFe 2 As 2 journal, October 2008

Ferromagnetic ordering in EuCu 2 P 2 journal, January 2011

Reentrant superconductivity in Eu(Fe 1− x Ir x ) 2 As 2 journal, June 2013

Polymorphism and physical properties of LnNi2As2 compounds (Ln = La → Gd) journal, September 1988

Ternäre Phosphide mit ThCr2Si2 -Struktur / Ternary Phosphides with the ThCr2Si2 Structure journal, February 1980

Antiferromagnetism in EuCu 2 As 2 and EuCu 1.82 Sb 2 single crystals journal, May 2015

A Neutron diffraction study of the magnetic structure of EuCo2P2 journal, May 1992

Superconductivity in iron compounds journal, December 2011

SHELXT – Integrated space-group and crystal-structure determination journal, January 2015

Signatures of quantum criticality in hole-doped and chemically pressurized EuFe 2 As 2 single crystals journal, January 2012

Nickel-based phosphide superconductor with infinite-layer structure, BaNi2P2 journal, July 2008

Superconductivity and the effects of pressure and structure in single-crystalline SrNi 2 P 2 journal, April 2009

Influence of uniaxial single-ion anisotropy on the magnetic and thermal properties of Heisenberg antiferromagnets within unified molecular field theory journal, March 2017

Magnetic properties of single crystal EuCo2Ge2 journal, August 2003

Magnetic ordering and dense Kondo behavior in EuFe 2 P 2 journal, September 2010

Unusual magnetic, thermal, and transport behavior of single-crystalline EuRh 2 As 2 journal, June 2009

Magnetic behavior of Eu Cu 2 As 2 : A delicate balance between antiferromagnetic and ferromagnetic order journal, November 2005

Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of Eu 2 + moments in EuFe 2 − x Ni x As 2 journal, March 2009

A Transition from Localized to Strongly Correlated Electron Behavior and Mixed Valence Driven by Physical or Chemical Pressure in ACo 2 As 2 (A = Eu and Ca) journal, February 2016

57 Fe and 151 Eu Mössbauer spectroscopy and magnetization studies of Eu(Fe 0.89 Co 0.11 ) 2 As 2 and Eu(Fe 0.9 Ni 0.1 ) 2 As 2 journal, February 2011

Magnetic structure and magnetization of helical antiferromagnets in high magnetic fields perpendicular to the helix axis at zero temperature journal, September 2017

Structural, thermal, magnetic, and electronic transport properties of the LaNi 2 (Ge 1 − x P x ) 2 system journal, February 2012

Ternary lanthanoid-transition metal pnictides with ThCr2Si2-type structure journal, April 1978

Heavy-fermion systems journal, October 1984

Magnetic ordering in EuRh 2 As 2 studied by x-ray resonant magnetic scattering journal, March 2009

Interplay of antiferromagnetism, ferromagnetism, and superconductivity in EuFe 2 (As 1 − x P x ) 2 single crystals journal, February 2011

Superconductivity Induced by Phosphorus Doping and Its Coexistence with Ferromagnetism in EuFe 2 ( As 0.7 P 0.3 ) 2 journal, April 2009

Magnetic properties of ternary lanthanoid transition metal arsenides studied by Mössbauer and susceptibility measurements journal, February 1993

Pressure-induced Transition of the Sublattice Magnetization in EuCo 2 P 2 : Change from Local Moment Eu ( 4 f ) to Itinerant Co ( 3 d ) Magnetism journal, January 1998

Crystal structure refinement with SHELXL journal, January 2015

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

Specific heat in some gadolinium compounds. I. Experimental journal, June 1991

On the coordination of ThCr2Si2 (BaAl4-type compounds within the field of free parameters journal, January 1996

High-temperature superconductivity in Eu 0.5 K 0.5 Fe 2 As 2 journal, September 2008

Formation of collapsed tetragonal phase in EuCo 2 As 2 under high pressure journal, October 2010

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

Superconductivity in SrNi 2 As 2 single crystals journal, November 2008

Crystal growth and physical properties of SrCu 2 As 2 , SrCu 2 Sb 2 , and BaCu 2 Sb 2 journal, June 2012

Antiferromagnetic transition in EuFe 2 As 2 : A possible parent compound for superconductors journal, August 2008

Magnetism and its microscopic origin in iron-based high-temperature superconductors journal, October 2012

Magnetic structure of EuFe 2 As 2 determined by single-crystal neutron diffraction journal, November 2009

EuRu2As2: A New Ferromagnetic Metal with Collapsed ThCr2Si2-Type Structure journal, September 2011

Evolution of superconductivity and ferromagnetism in Eu(Fe 1− x Ru x ) 2 As 2 journal, December 2012

A common thread: The pairing interaction for unconventional superconductors journal, October 2012

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

Magnetic exchange interactions in BaMn 2 As 2 : A case study of the J 1 - J 2 - J c Heisenberg model journal, September 2011

Magnetic structure of EuFe 2 P 2 studied by neutron powder diffraction journal, April 2011

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

Heavy-fermion systems journal, November 2000

Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2 text, January 2008

High-Temperature Superconductivity in Eu0.5K0.5Fe2As2 text, January 2008

Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe$_{2}$(As$_{0.7}$P$_{0.3}$)$_{2}$ text, January 2008

EuFe$_2$As$_2$ under high pressure: an antiferromagnetic bulk superconductor text, January 2009

FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2 text, January 2010

Superconductivity in Iron Compounds text, January 2011

Magnetism and its microscopic origin in iron-based high-temperature superconductors text, January 2012

Reentrant Superconductivity in Eu(Fe1-xIrx)2As2 text, January 2013

Unified Molecular Field Theory for Collinear and Noncollinear Heisenberg Antiferromagnets text, January 2014

Magnetic Dipole Interactions in Crystals text, January 2015

Influence of uniaxial single-ion anisotropy on the magnetic and thermal properties of Heisenberg antiferromagnets within unified molecular field theory text, January 2017

Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo{2-y}As2 text, January 2018

Spiral magnetic ordering of the Eu moments in EuNi$_{2}$As$_{2}$ text, January 2018

Title: Helical antiferromagnetic ordering in EuNi_1.95As₂ single crystals

The first order phase transition and superconductivity in BaNi ₂ As ₂ single crystals
journal, August 2008

Superconductivity and local-moment magnetism in $Eu {({Fe}_{0.89} {Co}_{0.11})}_{2} {As}_{2}$
journal, November 2009

Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet ${EuCo}_{2 - y} {As}_{2}$
journal, April 2018

${EuCo}_{2} P_{2}$ : A model molecular-field helical Heisenberg antiferromagnet
journal, July 2016

Mössbauer and magnetic susceptibility investigations of strontium, lanthanum and europium transition metal phosphides with ThCr2Si2 type structure
journal, January 1988

Magnetic dipole interactions in crystals
journal, January 2016

EuFe ₂ As ₂ under High Pressure: An Antiferromagnetic Bulk Superconductor
journal, August 2009

Lanthanoid and uranium nickel arsenides with CaBe2Ge2- and ThCr2Si2-type structures
journal, February 1988

Low-temperature heat capacity of antiferromagnetic ternary rare-earth iron silicides $M_{2} {Fe}_{3} {Si}_{5}$
journal, September 1983

Comparison of silver and molybdenum microfocus X-ray sources for single-crystal structure determination
journal, January 2015

Spiral magnetic ordering of the Eu moments in ${EuNi}_{2} {As}_{2}$
journal, January 2019

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

Magnetic structure and magnetization of $z$ -axis helical Heisenberg antiferromagnets with XY anisotropy in high magnetic fields transverse to the helix axis at zero temperature
journal, June 2019

Europium-based iron pnictides: a unique laboratory for magnetism, superconductivity and structural effects
journal, November 2016

Structural and magnetic phase transitions in the ternary iron arsenides SrFe ₂ As ₂ and EuFe ₂ As ₂
journal, October 2008

Ferromagnetic ordering in EuCu ₂ P ₂
journal, January 2011

Reentrant superconductivity in Eu(Fe _{1− x} Ir _x ) ₂ As ₂
journal, June 2013

Polymorphism and physical properties of LnNi2As2 compounds (Ln = La → Gd)
journal, September 1988

Ternäre Phosphide mit ThCr2Si2 -Struktur / Ternary Phosphides with the ThCr2Si2 Structure
journal, February 1980

Antiferromagnetism in ${EuCu}_{2} {As}_{2}$ and ${EuCu}_{1.82} {Sb}_{2}$ single crystals
journal, May 2015

A Neutron diffraction study of the magnetic structure of EuCo2P2
journal, May 1992

Superconductivity in iron compounds
journal, December 2011

SHELXT – Integrated space-group and crystal-structure determination
journal, January 2015

Signatures of quantum criticality in hole-doped and chemically pressurized EuFe $_{2}$ As $_{2}$ single crystals
journal, January 2012

Nickel-based phosphide superconductor with infinite-layer structure, BaNi2P2
journal, July 2008

Superconductivity and the effects of pressure and structure in single-crystalline ${SrNi}_{2} P_{2}$
journal, April 2009

Influence of uniaxial single-ion anisotropy on the magnetic and thermal properties of Heisenberg antiferromagnets within unified molecular field theory
journal, March 2017

Magnetic properties of single crystal EuCo2Ge2
journal, August 2003

Magnetic ordering and dense Kondo behavior in ${EuFe}_{2} P_{2}$
journal, September 2010

Unusual magnetic, thermal, and transport behavior of single-crystalline ${EuRh}_{2} {As}_{2}$
journal, June 2009

Magnetic behavior of $Eu {Cu}_{2} {As}_{2}$ : A delicate balance between antiferromagnetic and ferromagnetic order
journal, November 2005

Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of ${Eu}^{2 +}$ moments in ${EuFe}_{2 - x} {Ni}_{x} {As}_{2}$
journal, March 2009

A Transition from Localized to Strongly Correlated Electron Behavior and Mixed Valence Driven by Physical or Chemical Pressure in ACo ₂ As ₂ (A = Eu and Ca)
journal, February 2016

⁵⁷ Fe and ¹⁵¹ Eu Mössbauer spectroscopy and magnetization studies of Eu(Fe _0.89 Co _0.11 ) ₂ As ₂ and Eu(Fe _0.9 Ni _0.1 ) ₂ As ₂
journal, February 2011

Magnetic structure and magnetization of helical antiferromagnets in high magnetic fields perpendicular to the helix axis at zero temperature
journal, September 2017

Structural, thermal, magnetic, and electronic transport properties of the LaNi $_{2}$ (Ge $_{1 - x}$ P $_{x}$ ) $_{2}$ system
journal, February 2012

Ternary lanthanoid-transition metal pnictides with ThCr2Si2-type structure
journal, April 1978

Heavy-fermion systems
journal, October 1984

Magnetic ordering in ${EuRh}_{2} {As}_{2}$ studied by x-ray resonant magnetic scattering
journal, March 2009

Interplay of antiferromagnetism, ferromagnetism, and superconductivity in EuFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ single crystals
journal, February 2011

Superconductivity Induced by Phosphorus Doping and Its Coexistence with Ferromagnetism in ${EuFe}_{2} ({As}_{0.7} P_{0.3})_{2}$
journal, April 2009

Magnetic properties of ternary lanthanoid transition metal arsenides studied by Mössbauer and susceptibility measurements
journal, February 1993

Pressure-induced Transition of the Sublattice Magnetization in ${EuCo}_{2} P_{2}$ : Change from Local Moment $Eu (4 f)$ to Itinerant $Co (3 d)$ Magnetism
journal, January 1998

Crystal structure refinement with SHELXL
journal, January 2015

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

Specific heat in some gadolinium compounds. I. Experimental
journal, June 1991

On the coordination of ThCr2Si2 (BaAl4-type compounds within the field of free parameters
journal, January 1996

High-temperature superconductivity in ${Eu}_{0.5} K_{0.5} {Fe}_{2} {As}_{2}$
journal, September 2008

Formation of collapsed tetragonal phase in EuCo ₂ As ₂ under high pressure
journal, October 2010

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

Superconductivity in ${SrNi}_{2} {As}_{2}$ single crystals
journal, November 2008

Crystal growth and physical properties of SrCu $_{2}$ As $_{2}$ , SrCu $_{2}$ Sb $_{2}$ , and BaCu $_{2}$ Sb $_{2}$
journal, June 2012

Antiferromagnetic transition in ${EuFe}_{2} {As}_{2}$ : A possible parent compound for superconductors
journal, August 2008

Magnetism and its microscopic origin in iron-based high-temperature superconductors
journal, October 2012

Magnetic structure of ${EuFe}_{2} {As}_{2}$ determined by single-crystal neutron diffraction
journal, November 2009

EuRu2As2: A New Ferromagnetic Metal with Collapsed ThCr2Si2-Type Structure
journal, September 2011

Evolution of superconductivity and ferromagnetism in Eu(Fe _{1− x} Ru _x ) ₂ As ₂
journal, December 2012

A common thread: The pairing interaction for unconventional superconductors
journal, October 2012

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

Magnetic exchange interactions in ${BaMn}_{2} {As}_{2}$ : A case study of the $J_{1}$ - $J_{2}$ - $J_{c}$ Heisenberg model
journal, September 2011

Magnetic structure of EuFe $_{2}$ P $_{2}$ studied by neutron powder diffraction
journal, April 2011

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

Heavy-fermion systems
journal, November 2000

Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
text, January 2008

High-Temperature Superconductivity in Eu0.5K0.5Fe2As2
text, January 2008

Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe$_{2}$(As$_{0.7}$P$_{0.3}$)$_{2}$
text, January 2008

EuFe$_2$As$_2$ under high pressure: an antiferromagnetic bulk superconductor
text, January 2009

FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
text, January 2010

Superconductivity in Iron Compounds
text, January 2011

Magnetism and its microscopic origin in iron-based high-temperature superconductors
text, January 2012

Reentrant Superconductivity in Eu(Fe1-xIrx)2As2
text, January 2013

Unified Molecular Field Theory for Collinear and Noncollinear Heisenberg Antiferromagnets
text, January 2014

Magnetic Dipole Interactions in Crystals
text, January 2015

Influence of uniaxial single-ion anisotropy on the magnetic and thermal properties of Heisenberg antiferromagnets within unified molecular field theory
text, January 2017

Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo{2-y}As2
text, January 2018

Spiral magnetic ordering of the Eu moments in EuNi$_{2}$As$_{2}$
text, January 2018