Crystallographic, electronic, thermal, and magnetic properties of single-crystal SrCo2As2

Pandey, Abhishek; Quirinale, D. G.; Jayasekara, W.; Sapkota, A.; Kim, M. G.; Dhaka, R. S.; Lee, Y.; Heitmann, T. W.; Stephens, P. W.; Ogloblichev, V.; Kreyssig, A.; McQueeney, R. J.; Goldman, A. I.; Kaminski, Adam; Harmon, B. N.; Furukawa, Y.; Johnston, D. C.

doi:10.1103/PhysRevB.88.014526

Crystallographic, electronic, thermal, and magnetic properties of single-crystal SrCo₂As₂

Journal Article · Mon Jul 01 00:00:00 EDT 2013 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.88.014526· OSTI ID:1127239

Pandey, Abhishek ^[1]; Quirinale, D. G. ^[1]; Jayasekara, W. ^[1]; Sapkota, A. ^[1]; Kim, M. G. ^[2]; Dhaka, R. S. ^[1]; Lee, Y. ^[1]; Heitmann, T. W. ^[3]; Stephens, P. W. ^[4]; Ogloblichev, V. ^[5]; Kreyssig, A. ^[1]; McQueeney, R. J. ^[1]; Goldman, A. I. ^[1]; Kaminski, Adam ^[1]; Harmon, B. N. ^[1]; Furukawa, Y. ^[1]; Johnston, D. C. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Missouri, Columbia, MO (United States). Missouri Research Reactor
State Univ. of New York (SUNY), Plattsburgh, NY (United States)
Russian Academy of Sciences, Urals Div., Ekaterinburg (Russian Federation). Inst. of Metal Physics

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 that shed further light on this fascinating material. The c-axis thermal expansion coefficient α_c is negative from 7 to 300 K, whereas α_a is positive over this T range. The ρ(T) shows metallic character. The ARPES measurements and band theory confirm the metallic character and in addition show the presence of a flat band near the Fermi energy E_F. The band calculations exhibit an extremely sharp peak in the density of states D(E_F) arising from a flat d_x²-y² band. A comparison of the Sommerfeld coefficient of the electronic specific heat with χ(T → 0) suggests the presence of strong ferromagnetic itinerant spin correlations which on the basis of the Stoner criterion predicts that SrCo₂As₂ should be an itinerant ferromagnet, in conflict with the magnetization data. The χ(T) does have a large magnitude, but also exhibits a broad maximum at 115 K suggestive of dynamic short-range AFM spin correlations, in agreement with the neutron scattering data. The measurements show no evidence for any type of phase transition between 1.3 and 300 K and we propose that metallic SrCo₂As₂ has a gapless quantum spin-liquid ground state.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1127239

Alternate ID(s):: OSTI ID: 1109758

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 1 Vol. 88; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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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 Sangeetha, N. S.; Wang, L. -L.; Smirnov, A. V. Physical Review B, Vol. 100, Issue 9 https://doi.org/10.1103/physrevb.100.094447	journal	September 2019
Helical magnetic ordering in Sr ( Co 1 − x Ni x ) 2 As 2 Wilde, J. M.; Kreyssig, A.; Vaknin, D. Physical Review B, Vol. 100, Issue 16 https://doi.org/10.1103/physrevb.100.161113	journal	October 2019
Crystal and magnetic structure of CaCo 1.86 As 2 studied by x-ray and neutron diffraction Quirinale, D. G.; Anand, V. K.; Kim, M. G. Physical Review B, Vol. 88, Issue 17 https://doi.org/10.1103/physrevb.88.174420	journal	November 2013
NMR investigation of spin correlations in BaCo 2 As 2 Ahilan, K.; Imai, T.; Sefat, A. S. Physical Review B, Vol. 90, Issue 1 https://doi.org/10.1103/physrevb.90.014520	journal	July 2014
Coexistence of antiferromagnetic and ferromagnetic spin correlations in SrCo 2 As 2 revealed by Co 59 and As 75 NMR Wiecki, P.; Ogloblichev, V.; Pandey, Abhishek Physical Review B, Vol. 91, Issue 22 https://doi.org/10.1103/physrevb.91.220406	journal	June 2015
Influence of surface symmetry breaking on the magnetism, collapsing, and three-dimensional dispersion of the Co pnictides A Co 2 As 2 ( A = Ba , Sr, Ca) Mansart, Joseph; Le Fèvre, Patrick; Bertran, François Physical Review B, Vol. 94, Issue 23 https://doi.org/10.1103/physrevb.94.235147	journal	December 2016
Magnetic fluctuations and superconducting properties of CaKFe 4 As 4 studied by As 75 NMR Cui, J.; Ding, Q. -P.; Meier, W. R. Physical Review B, Vol. 96, Issue 10 https://doi.org/10.1103/physrevb.96.104512	journal	September 2017
NMR study of the new magnetic superconductor CaK ( Fe 0.951 Ni 0.049 ) 4 As 4 : Microscopic coexistence of the hedgehog spin-vortex crystal and superconductivity Ding, Q. -P.; Meier, W. R.; Böhmer, A. E. Physical Review B, Vol. 96, Issue 22 https://doi.org/10.1103/physrevb.96.220510	journal	December 2017
Persistent correlation between superconductivity and antiferromagnetic fluctuations near a nematic quantum critical point in FeSe 1 − x S x Wiecki, P.; Rana, K.; Böhmer, A. E. Physical Review B, Vol. 98, Issue 2 https://doi.org/10.1103/physrevb.98.020507	journal	July 2018
Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo 2 As 2 Li, Yu; Yin, Zhiping; Liu, Zhonghao Physical Review Letters, Vol. 122, Issue 11 https://doi.org/10.1103/physrevlett.122.117204	journal	March 2019

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