Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity

Cui, J.; Roy, B.; Tanatar, M. A.; Ran, S.; Bud'ko, S. L.; Prozorov, R.; Canfield, P. C.; Furukawa, Y.

doi:10.1103/PhysRevB.92.184504

Title: Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe_1-xCo_x)₂As₂ studied by⁷⁵As nuclear magnetic resonance and anisotropic resistivity

Abstract

We report ⁷⁵As nuclear magnetic resonance (NMR) measurements of single-crystalline Ca(Fe_1–xCo_x)₂As₂ (x=0.023, 0.028, 0.033, and 0.059) annealed at 350°C for 7 days. From the observation of a characteristic shape of ⁷⁵As NMR spectra in the stripe-type antiferromagnetic (AFM) state, as in the case of x=0 (T_N=170 K), clear evidence for the commensurate AFM phase transition with the concomitant structural phase transition is observed in x=0.023 (T_N=106 K) and x=0.028 (T_N=53 K). Through the temperature dependence of the Knight shifts and the nuclear spin lattice relaxation rates (1/T₁), although stripe-type AFM spin fluctuations are realized in the paramagnetic state as in the case of other iron pnictide superconductors, we found a gradual decrease of the AFM spin fluctuations below a crossover temperature T* that was nearly independent of Co-substitution concentration, and it is attributed to a pseudogaplike behavior in the spin excitation spectra of these systems. The T* feature finds correlation with features in the temperature-dependent interplane resistivity, _{ρ_c}(T), but not with the in-plane resistivity _{ρ_a}(T). The temperature evolution of anisotropic stripe-type AFM spin fluctuations is tracked in the paramagnetic and pseudogap phases by the 1/T₁ data measured under magnetic fields parallel and perpendicular to the c axis. As a result,more »« less

Authors:

Cui, J. ^[1]; Roy, B. ^[1]; Tanatar, M. A. ^[1]; Ran, S. ^[1]; Bud'ko, S. L. ^[1]; Prozorov, R. ^[1]; Canfield, P. C. ^[1]; Furukawa, Y. ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Publication Date:: Fri Nov 06 00:00:00 EST 2015

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1234536

Alternate Identifier(s):: OSTI ID: 1225392

Report Number(s):: IS-J-8859
Journal ID: ISSN 1098-0121; PRBMDO

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 92; Journal Issue: 18; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Cui, J., Roy, B., Tanatar, M. A., Ran, S., Bud'ko, S. L., Prozorov, R., Canfield, P. C., and Furukawa, Y. Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevB.92.184504.

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                    Cui, J., Roy, B., Tanatar, M. A., Ran, S., Bud'ko, S. L., Prozorov, R., Canfield, P. C., & Furukawa, Y. Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity.  United States.  https://doi.org/10.1103/PhysRevB.92.184504

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                    Cui, J., Roy, B., Tanatar, M. A., Ran, S., Bud'ko, S. L., Prozorov, R., Canfield, P. C., and Furukawa, Y. Fri .  
"Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity".  United States.  https://doi.org/10.1103/PhysRevB.92.184504.  https://www.osti.gov/servlets/purl/1234536.

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@article{osti_1234536,

  title        = {Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity},

  author       = {Cui, J. and Roy, B. and Tanatar, M. A. and Ran, S. and Bud'ko, S. L. and Prozorov, R. and Canfield, P. C. and Furukawa, Y.},

  abstractNote = {We report 75As nuclear magnetic resonance (NMR) measurements of single-crystalline Ca(Fe1–xCox)2As2 (x=0.023, 0.028, 0.033, and 0.059) annealed at 350°C for 7 days. From the observation of a characteristic shape of 75As NMR spectra in the stripe-type antiferromagnetic (AFM) state, as in the case of x=0 (TN=170 K), clear evidence for the commensurate AFM phase transition with the concomitant structural phase transition is observed in x=0.023 (TN=106 K) and x=0.028 (TN=53 K). Through the temperature dependence of the Knight shifts and the nuclear spin lattice relaxation rates (1/T1), although stripe-type AFM spin fluctuations are realized in the paramagnetic state as in the case of other iron pnictide superconductors, we found a gradual decrease of the AFM spin fluctuations below a crossover temperature T* that was nearly independent of Co-substitution concentration, and it is attributed to a pseudogaplike behavior in the spin excitation spectra of these systems. The T* feature finds correlation with features in the temperature-dependent interplane resistivity, ρc(T), but not with the in-plane resistivity ρa(T). The temperature evolution of anisotropic stripe-type AFM spin fluctuations is tracked in the paramagnetic and pseudogap phases by the 1/T1 data measured under magnetic fields parallel and perpendicular to the c axis. As a result, based on our NMR data, we have added a pseudogaplike phase to the magnetic and electronic phase diagram of Ca(Fe1–xCox)2As2.},

  doi          = {10.1103/PhysRevB.92.184504},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 18,

  volume       = 92,

  place        = {United States},

  year         = {Fri Nov 06 00:00:00 EST 2015},

  month        = {Fri Nov 06 00:00:00 EST 2015}

}

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DOI: 10.1080/00107519508232300

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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
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In tetragonal SrCo₂As₂single crystals, inelastic neutron scattering measurements demonstrated that strong stripe-type antiferromagnetic (AFM) correlations occur at a temperature T = 5 K [W. Jayasekara et al., arXiv:1306.5174] that are the same as in the isostructural AFe₂As₂ (A = Ca, Sr, Ba) parent compounds of high-T_c superconductors. This surprising discovery suggests that SrCo₂As₂ may also be a good parent compound for high-T_csuperconductivity. Here, structural and thermal expansion, electrical resistivity ρ, angle-resolved photoemission spectroscopy (ARPES), heat capacity C_p, magnetic susceptibility χ, ⁷⁵As NMR and neutron diffraction measurements of SrCo₂As₂ crystals are reported together with LDA band structure calculations thatmore »« less
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Itinerant G-type antiferromagnet SrCr₂ As₂ studied by magnetization, heat capacity, electrical resistivity, and NMR measurements

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Here, the physical properties of itinerant antiferromagnetic (AFM) SrCr₂ As₂ with body-centered tetragonal ThCr₂Si₂ structure were investigated in single crystalline and polycrystalline forms by electrical resistivity ρ, heat capacity C_p, magnetic susceptibility χ versus temperature T, and magnetization M versus applied magnetic field H isotherm measurements as well as ⁷⁵As and ⁵³Cr nuclear magnetic resonance (NMR) measurements in the wide temperature range T = 1.6–900 K. From the χ(T) and ⁷⁵As NMR measurements, the G-type AFM state below T_N = 615(15) K has been determined, consistent with the previous neutron-diffraction measurements. Direct evidence of magnetic ordering of the Cr spins was shown by the observation of the ⁵³Cr NMR spectrum under H = 0. From the χ( T) measurements on single-crystal SrCr₂ As₂ under the two different magnetic field directions H|| ab and H || c in the AFM state, the Cr ordered moments are shown to align along the c axis in the G-type AFM state. The metallic state is directly evidenced by the ρ, C_p, and NMR measurements, and the density of states at the Fermi energymore »« less
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Incommensurate and commensurate antiferromagnetic states in Ca Mn 2 As 2 and Sr Mn 2 As 2 revealed by As 75 NMR

Journal Article Ding, Q. -P. ; Sangeetha, N. S. ; Pandey, Abhishek ; ... - Physical Review. B

Here, we carried out ⁷⁵As nuclear magnetic resonance (NMR) measurements on the trigonal CaMn₂ As₂ and SrMn₂ As₂ insulators exhibiting antiferromagnetic (AFM) ordered states below Néel temperatures T_N = 62 and 120 K, respectively. In the paramagnetic state above T_N, typical quadrupolar-split ⁷⁵As NMR spectra were observed for both systems. The ⁷⁵As quadrupolar frequency ν_Q for CaMn₂ As₂ decreases with decreasing temperature, while ν_Q for SrMn₂ As₂ increases, showing an opposite temperature dependence. In the AFM state, the relatively sharp and distinct ⁷⁵As NMR lines were observed in SrMn₂ As₂ and the NMR spectra were shifted to lower fields formore »« less
https://doi.org/10.1103/physrevb.104.224413

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Title: Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity

Abstract

Citation Formats

Iron-Based Layered Superconductor La[O 1- x F x ]FeAs ( x = 0.05−0.12) with T c = 26 K journal, March 2008

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

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

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First-order structural phase transition in CaFe 2 As 2 journal, July 2008

Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure journal, May 2009

Lattice and magnetic instabilities in CaFe 2 As 2 : A single-crystal neutron diffraction study journal, September 2008

Anisotropic magnetic and superconducting properties of CaFe 2 − x Co x As 2 ( x = 0 , 0.06 ) single crystals journal, January 2009

Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe 2 − x Ni x As 2 journal, October 2009

Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe 1 − x Co x ) 2 As 2 journal, June 2012

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Absence of superconductivity in single-phase CaFe 2 As 2 under hydrostatic pressure journal, January 2009

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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

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

Determination of the phase diagram of the electron-doped superconductor Ba ( Fe 1 − x Co x ) 2 As 2 journal, January 2009

To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report journal, June 2009

Quenched Fe moment in the collapsed tetragonal phase of Ca 1− x Pr x Fe 2 As 2 journal, May 2013

NMR Investigation of Superconductivity and Antiferromagnetism in CaFe 2 As 2 under Pressure journal, June 2009

First-order magnetic transition in single-crystalline CaFe 2 As 2 detected by A 75 s nuclear magnetic resonance journal, February 2009

Low-energy spin dynamics in the antiferromagnetic phase of CaFe 2 As 2 journal, July 2009

Pressure-induced unconventional superconductivity near a quantum critical point in CaFe 2 As 2 journal, April 2010

Suppression of electron correlations in the collapsed tetragonal phase of Ca Fe 2 As 2 under ambient pressure demonstrated by As 75 NMR/NQR measurements journal, March 2014

Pseudogap-like phase in Ca(Fe 1 − x Co x ) 2 As 2 revealed by 75 As NQR journal, September 2011

Contrasting Spin Dynamics between Underdoped and Overdoped Ba ( Fe 1 − x Co x ) 2 As 2 journal, January 2010

Pseudogap and its critical point in the heavily doped Ba ( Fe 1 − x Co x ) 2 As 2 from c -axis resistivity measurements journal, October 2010

Effects of isovalent substitution and pressure on the interplane resistivity of single-crystal Ba ( Fe 1 − x Ru x ) 2 As 2 journal, September 2014

Systematics of the temperature-dependent interplane resistivity in Ba(Fe 1 − x M x ) 2 As 2 ( M = Co , Rh, Ni, and Pd) journal, July 2011

Interplane resistivity of underdoped single crystals (Ba 1 − x K x )Fe 2 As 2 ( 0 ≤ x < 0.34 ) journal, April 2014

Fermi surface dichotomy of the superconducting gap and pseudogap in underdoped pnictides journal, July 2011

Pseudogap formation above the superconducting dome in iron pnictides journal, January 2014

Infrared Measurement of the Pseudogap of P-Doped and Co-Doped High-Temperature BaFe 2 As 2 Superconductors journal, July 2012

Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe 1 − x Co x ) 2 As 2 journal, July 2011

Dramatic changes in the electronic structure upon transition to the collapsed tetragonal phase in CaFe 2 As 2 journal, January 2014

Phase diagram of the iron arsenide superconductors Ca(Fe 1 − x Co x ) 2 As 2 ( 0 ⩽ x ⩽ 0 . 2 ) journal, March 2011

Nernst effect in single crystals of the pnictide superconductor CaFe 1.92 Co 0.08 As 2 and parent compound CaFe 2 As 2 journal, January 2010

Single crystal growth and superconductivity of Ca(Fe 1− x Co x ) 2 As 2 journal, August 2012

Growth of single crystals from metallic fluxes journal, June 1992

Thermal expansion of CaFe 2 As 2 : Effect of cobalt doping and postgrowth thermal treatment journal, August 2013

Anisotropy of the iron pnictide superconductor Ba ( Fe 1 − x Co x ) 2 As 2 ( x = 0.074 , T c = 23 K ) journal, March 2009

Field-dependent transport critical current in single crystals of Ba(Fe 1 − x TM x ) 2 As 2 (TM = Co, Ni) superconductors journal, April 2010

Method for Measuring Electrical Resistivity of Anisotropic Materials journal, June 1971

Series for Computing Current Flow in a Rectangular Block journal, June 1971

Commensurate Itinerant Antiferromagnetism in BaFe 2 As 2 : 75 As-NMR Studies on a Self-Flux Grown Single Crystal journal, November 2008

Principles of Magnetic Resonance book, January 1990

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Critical behavior of the spin density wave transition in underdoped Ba(Fe 1 − x Co x ) 2 As 2 ( x ≤ 0.05 ): As 75 NMR investigation journal, June 2014

Local magnetic inhomogeneities in Ba ( Fe 1 − x Ni x ) 2 As 2 as seen via A 75 s NMR journal, October 2010

Paramagnetic spin correlations in CaFe 2 As 2 single crystals journal, June 2010

Evidence for filamentary superconductivity nucleated at antiphase domain walls in antiferromagnetic CaFe 2 As 2 journal, January 2012

Unconventional pairing in the iron arsenide superconductors journal, April 2010

Local antiferromagnetic correlations in the iron pnictide superconductors LaFeAsO 1 − x F x and Ca ( Fe 1 − x Co x ) 2 As 2 as seen via normal-state susceptibility journal, January 2010

As 75 NMR Studies of Superconducting LaFeAs O 0.9 F 0.1 journal, July 2008

Evidence for Unconventional Superconductivity in Arsenic-Free Iron-Based Superconductor FeSe: A 77 Se-NMR Study journal, November 2008

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75As NMR-NQR study in superconducting LiFeAs journal, May 2012

Effect of Spin Fluctuations on the Electric Field Gradient in Itinerant Electron Magnets journal, March 1978

The Effect of Electron-Electron Interaction on the Nuclear Spin Relaxation in Metals journal, April 1963

Antiferromagnetism of SrFe 2 As 2 Studied by Single-Crystal 75 As-NMR journal, June 2009

Stripe antiferromagnetic correlations in LaFeAsO 1 − x F x probed by A 75 s NMR journal, June 2010

Potential Antiferromagnetic Fluctuations in Hole-Doped Iron-Pnictide Superconductor Ba 1- x K x Fe 2 As 2 Studied by 75 As Nuclear Magnetic Resonance Measurement journal, May 2012

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

Nodeless energy gaps of single-crystalline Ba 0 . 68 K 0 . 32 Fe 2 As 2 as seen via As 75 NMR journal, April 2011

Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic transition in LaFeAs(O 1 − x F x ) probed by 75 As and 139 La NMR journal, April 2012

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Unconventional superconductivity journal, November 1995

Title: Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe_1-xCo_x)₂As₂ studied by⁷⁵As nuclear magnetic resonance and anisotropic resistivity

Iron-Based Layered Superconductor La[O _1- _x F _x ]FeAs ( x = 0.05−0.12) with T _c = 26 K
journal, March 2008

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
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 iron compounds
journal, December 2011

Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c 2}$ in $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ single crystals
journal, December 2008

First-order structural phase transition in ${CaFe}_{2} {As}_{2}$
journal, July 2008

Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure
journal, May 2009

Lattice and magnetic instabilities in ${CaFe}_{2} {As}_{2}$ : A single-crystal neutron diffraction study
journal, September 2008

Anisotropic magnetic and superconducting properties of ${CaFe}_{2 - x} {Co}_{x} {As}_{2}$ $(x = 0, 0.06)$ single crystals
journal, January 2009

Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in ${CaFe}_{2 - x} {Ni}_{x} {As}_{2}$
journal, October 2009

Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$
journal, June 2012

Pressure Induced Superconductivity in ${CaFe}_{2} {As}_{2}$
journal, July 2008

Pressure-induced superconducting state of antiferromagnetic ${CaFe}_{2} {As}_{2}$
journal, July 2009

Absence of superconductivity in single-phase ${CaFe}_{2} {As}_{2}$ under hydrostatic pressure
journal, January 2009

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

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

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

Determination of the phase diagram of the electron-doped superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$
journal, January 2009

To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
journal, June 2009

Quenched Fe moment in the collapsed tetragonal phase of Ca _{1− x} Pr _x Fe ₂ As ₂
journal, May 2013

NMR Investigation of Superconductivity and Antiferromagnetism in ${CaFe}_{2} {As}_{2}$ under Pressure
journal, June 2009

First-order magnetic transition in single-crystalline ${CaFe}_{2} {As}_{2}$ detected by ${}^{75}A s$ nuclear magnetic resonance
journal, February 2009

Low-energy spin dynamics in the antiferromagnetic phase of CaFe ₂ As ₂
journal, July 2009

Pressure-induced unconventional superconductivity near a quantum critical point in CaFe ₂ As ₂
journal, April 2010

Suppression of electron correlations in the collapsed tetragonal phase of $Ca {Fe}_{2} {As}_{2}$ under ambient pressure demonstrated by ${}^{75}{As}$ NMR/NQR measurements
journal, March 2014

Pseudogap-like phase in Ca(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ revealed by $^{75}$ As NQR
journal, September 2011

Contrasting Spin Dynamics between Underdoped and Overdoped $Ba ({Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$
journal, January 2010

Pseudogap and its critical point in the heavily doped $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ from $c$ -axis resistivity measurements
journal, October 2010

Effects of isovalent substitution and pressure on the interplane resistivity of single-crystal $Ba ({Fe}_{1 - x} {Ru}_{x})_{2} {As}_{2}$
journal, September 2014

Systematics of the temperature-dependent interplane resistivity in Ba(Fe $_{1 - x} M_{x}$ ) $_{2}$ As $_{2}$ ( $M = Co$ , Rh, Ni, and Pd)
journal, July 2011

Interplane resistivity of underdoped single crystals (Ba $_{1 - x}$ K $_{x}$ )Fe $_{2}$ As $_{2}$ ( $0 \leq x < 0.34$ )
journal, April 2014

Fermi surface dichotomy of the superconducting gap and pseudogap in underdoped pnictides
journal, July 2011

Pseudogap formation above the superconducting dome in iron pnictides
journal, January 2014

Infrared Measurement of the Pseudogap of P-Doped and Co-Doped High-Temperature ${BaFe}_{2} {As}_{2}$ Superconductors
journal, July 2012

Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$
journal, July 2011

Dramatic changes in the electronic structure upon transition to the collapsed tetragonal phase in CaFe $_{2}$ As $_{2}$
journal, January 2014

Phase diagram of the iron arsenide superconductors Ca(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ ( $0 ⩽ x ⩽ 0.2$ )
journal, March 2011

Nernst effect in single crystals of the pnictide superconductor ${CaFe}_{1.92} {Co}_{0.08} {As}_{2}$ and parent compound ${CaFe}_{2} {As}_{2}$
journal, January 2010

Single crystal growth and superconductivity of Ca(Fe _{1− x} Co _x ) ₂ As ₂
journal, August 2012

Growth of single crystals from metallic fluxes
journal, June 1992

Thermal expansion of CaFe $_{2}$ As $_{2}$ : Effect of cobalt doping and postgrowth thermal treatment
journal, August 2013

Anisotropy of the iron pnictide superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ $(x = 0.074, T_{c} = 23 K)$
journal, March 2009

Field-dependent transport critical current in single crystals of Ba(Fe _{1 − x} TM _x ) ₂ As ₂ (TM = Co, Ni) superconductors
journal, April 2010

Method for Measuring Electrical Resistivity of Anisotropic Materials
journal, June 1971

Series for Computing Current Flow in a Rectangular Block
journal, June 1971

Commensurate Itinerant Antiferromagnetism in BaFe ₂ As ₂ : ⁷⁵ As-NMR Studies on a Self-Flux Grown Single Crystal
journal, November 2008

Principles of Magnetic Resonance
book, January 1990

${}^{59}C o$ and ${}^{75}A s$ NMR investigation of lightly doped $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ $(x = 0.02, 0.04)$
journal, April 2009

Critical behavior of the spin density wave transition in underdoped ${Ba(Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$ ( $x \leq 0.05$ ): ${}^{75}{As}$ NMR investigation
journal, June 2014

Local magnetic inhomogeneities in $Ba {({Fe}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$ as seen via ${}^{75}A s$ NMR
journal, October 2010

Paramagnetic spin correlations in ${CaFe}_{2} {As}_{2}$ single crystals
journal, June 2010

Evidence for filamentary superconductivity nucleated at antiphase domain walls in antiferromagnetic CaFe $_{2}$ As $_{2}$
journal, January 2012

Unconventional pairing in the iron arsenide superconductors
journal, April 2010

Local antiferromagnetic correlations in the iron pnictide superconductors ${LaFeAsO}_{1 - x} F_{x}$ and $Ca {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ as seen via normal-state susceptibility
journal, January 2010

${}^{75}{As}$ NMR Studies of Superconducting $LaFeAs O_{0.9} F_{0.1}$
journal, July 2008

Evidence for Unconventional Superconductivity in Arsenic-Free Iron-Based Superconductor FeSe: A ⁷⁷ Se-NMR Study
journal, November 2008

${}^{77}{Se}$ NMR investigation of the $K_{x}$ Fe $_{2 - y}$ Se $_{2}$ high- $T_{c}$ superconductor ( $T_{c} = 33$ K)
journal, March 2011

Local electromagnetic properties of magnetic pnictides: a comparative study probed by NMR measurements
journal, April 2013

75As NMR-NQR study in superconducting LiFeAs
journal, May 2012

Effect of Spin Fluctuations on the Electric Field Gradient in Itinerant Electron Magnets
journal, March 1978

The Effect of Electron-Electron Interaction on the Nuclear Spin Relaxation in Metals
journal, April 1963

Antiferromagnetism of SrFe ₂ As ₂ Studied by Single-Crystal ⁷⁵ As-NMR
journal, June 2009

Stripe antiferromagnetic correlations in ${LaFeAsO}_{1 - x} F_{x}$ probed by ${}^{75}A s$ NMR
journal, June 2010

Potential Antiferromagnetic Fluctuations in Hole-Doped Iron-Pnictide Superconductor Ba _{1- x} K _x Fe ₂ As ₂ Studied by ⁷⁵ As Nuclear Magnetic Resonance Measurement
journal, May 2012

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

Nodeless energy gaps of single-crystalline Ba $_{0.68}$ K $_{0.32}$ Fe $_{2}$ As $_{2}$ as seen via ${}^{75}{As}$ NMR
journal, April 2011

Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic transition in LaFeAs(O $_{1 - x}$ F $_{x}$ ) probed by $^{75}$ As and $^{139}$ La NMR
journal, April 2012

Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR
journal, September 2015

Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides
journal, May 2013

Unconventional superconductivity
journal, April 2017

Unconventional superconductivity
journal, November 1995