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Title: Anisotropic thermodynamic and transport properties of single-crystalline CaKFe 4 As 4

Abstract

We grew single-crystalline, single-phase CaKFe4As4 out of a high-temperature, quaternary melt. Temperature-dependent measurements of x-ray diffraction, anisotropic electrical resistivity, elastoresistivity, thermoelectric power, Hall effect, magnetization, and specific heat, combined with field-dependent measurements of electrical resistivity and field and pressure-dependent measurements of magnetization indicate that CaKFe4As4 is an ordered, stoichiometric, Fe-based superconductor with a superconducting critical temperature, Tc=35.0±0.2 K. Other than superconductivity, there is no indication of any other phase transition for 1.8K≤T≤300 K. All of these thermodynamic and transport data reveal striking similarities to those found for optimally or slightly overdoped (Ba1-xKx)Fe2As2, suggesting that stoichiometric CaKFe4As4 is intrinsically close to what is referred to as “optimal-doped” on a generalized, Fe-based superconductor, phase diagram. Furthermore, the anisotropic superconducting upper critical field, Hc2(T), of CaKFe4As4 was determined up to 630 kOe. The anisotropy parameter γ(T)=H$$⊥\atop{c2}$$/H$$∥\atop{c2}$$, for H applied perpendicular and parallel to the c axis, decreases from ≃2.5 at Tc to ≃1.5 at 25 K, which can be explained by interplay of paramagnetic pair breaking and orbital effects. The slopes of dH$$∥\atop{c2}$$/dT≃-44 kOe/K and dH$$⊥\atop{c2}$$/dT≃-109 kOe/K at Tc yield an electron mass anisotropy of m/m≃1/6 and short Ginzburg-Landau coherence lengths ξ(0)≃5.8Å and ξ(0)≃14.3Å. Finally, the value of H$$⊥\atop{c2}$$(0) can be extrapolated to ≃920 kOe, well above the BCS paramagnetic limit.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [4];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab.
  4. Old Dominion Univ., Norfolk, VA (United States). Dept. of Physics
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1326848
Alternate Identifier(s):
OSTI ID: 1280184
Report Number(s):
IS-J 9081
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358; AC02-06CH11357; DMR-1157490; GBMF4411
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Meier, W. R., Kong, T., Kaluarachchi, U. S., Taufour, V., Jo, N. H., Drachuck, G., Böhmer, A. E., Saunders, S. M., Sapkota, A., Kreyssig, A., Tanatar, M. A., Prozorov, R., Goldman, A. I., Balakirev, Fedor F., Gurevich, Alex, Bud'ko, S. L., and Canfield, P. C. Anisotropic thermodynamic and transport properties of single-crystalline CaKFe4As4. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.064501.
Meier, W. R., Kong, T., Kaluarachchi, U. S., Taufour, V., Jo, N. H., Drachuck, G., Böhmer, A. E., Saunders, S. M., Sapkota, A., Kreyssig, A., Tanatar, M. A., Prozorov, R., Goldman, A. I., Balakirev, Fedor F., Gurevich, Alex, Bud'ko, S. L., & Canfield, P. C. Anisotropic thermodynamic and transport properties of single-crystalline CaKFe4As4. United States. doi:https://doi.org/10.1103/PhysRevB.94.064501
Meier, W. R., Kong, T., Kaluarachchi, U. S., Taufour, V., Jo, N. H., Drachuck, G., Böhmer, A. E., Saunders, S. M., Sapkota, A., Kreyssig, A., Tanatar, M. A., Prozorov, R., Goldman, A. I., Balakirev, Fedor F., Gurevich, Alex, Bud'ko, S. L., and Canfield, P. C. Mon . "Anisotropic thermodynamic and transport properties of single-crystalline CaKFe4As4". United States. doi:https://doi.org/10.1103/PhysRevB.94.064501. https://www.osti.gov/servlets/purl/1326848.
@article{osti_1326848,
title = {Anisotropic thermodynamic and transport properties of single-crystalline CaKFe4As4},
author = {Meier, W. R. and Kong, T. and Kaluarachchi, U. S. and Taufour, V. and Jo, N. H. and Drachuck, G. and Böhmer, A. E. and Saunders, S. M. and Sapkota, A. and Kreyssig, A. and Tanatar, M. A. and Prozorov, R. and Goldman, A. I. and Balakirev, Fedor F. and Gurevich, Alex and Bud'ko, S. L. and Canfield, P. C.},
abstractNote = {We grew single-crystalline, single-phase CaKFe4As4 out of a high-temperature, quaternary melt. Temperature-dependent measurements of x-ray diffraction, anisotropic electrical resistivity, elastoresistivity, thermoelectric power, Hall effect, magnetization, and specific heat, combined with field-dependent measurements of electrical resistivity and field and pressure-dependent measurements of magnetization indicate that CaKFe4As4 is an ordered, stoichiometric, Fe-based superconductor with a superconducting critical temperature, Tc=35.0±0.2 K. Other than superconductivity, there is no indication of any other phase transition for 1.8K≤T≤300 K. All of these thermodynamic and transport data reveal striking similarities to those found for optimally or slightly overdoped (Ba1-xKx)Fe2As2, suggesting that stoichiometric CaKFe4As4 is intrinsically close to what is referred to as “optimal-doped” on a generalized, Fe-based superconductor, phase diagram. Furthermore, the anisotropic superconducting upper critical field, Hc2(T), of CaKFe4As4 was determined up to 630 kOe. The anisotropy parameter γ(T)=H$⊥\atop{c2}$/H$∥\atop{c2}$, for H applied perpendicular and parallel to the c axis, decreases from ≃2.5 at Tc to ≃1.5 at 25 K, which can be explained by interplay of paramagnetic pair breaking and orbital effects. The slopes of dH$∥\atop{c2}$/dT≃-44 kOe/K and dH$⊥\atop{c2}$/dT≃-109 kOe/K at Tc yield an electron mass anisotropy of m⊥/m∥≃1/6 and short Ginzburg-Landau coherence lengths ξ∥(0)≃5.8Å and ξ⊥(0)≃14.3Å. Finally, the value of H$⊥\atop{c2}$(0) can be extrapolated to ≃920 kOe, well above the BCS paramagnetic limit.},
doi = {10.1103/PhysRevB.94.064501},
journal = {Physical Review B},
number = 6,
volume = 94,
place = {United States},
year = {2016},
month = {8}
}

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