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

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1338222
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 94; Journal Issue: 6
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

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: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.. 2016. "Anisotropic thermodynamic and transport properties of single-crystalline CaKFe4As4". United States. doi:10.1103/PhysRevB.94.064501.
@article{osti_1338222,
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 = {},
doi = {10.1103/PhysRevB.94.064501},
journal = {Physical Review B},
number = 6,
volume = 94,
place = {United States},
year = 2016,
month = 8
}
  • Cited by 6
  • We grew single-crystalline, single-phase CaKFe 4As 4 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 CaKFe 4As 4 is an ordered, stoichiometric, Fe-based superconductor with a superconducting critical temperature, T c=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 (Ba 1-xKx)Fe 2As 2, suggesting that stoichiometric CaKFe 4As 4 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, H c2(T), of CaKFe 4As 4 was determined up to 630 kOe. The anisotropy parameter γ(T)=Hmore » $$⊥\atop{c2}$$/H$$∥\atop{c2}$$, for H applied perpendicular and parallel to the c axis, decreases from ≃2.5 at T c 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 T c 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.« less
  • Cited by 30
  • We present a detailed study of single crystalline K 2Cr 3As 3 and analyze its thermodynamic and transport properties, anisotropic H c2(T), and initial pressure dependence of T c. In zero field, the temperature-dependent resistivity is metallic. Deviation from a linear temperature dependence is evident below 100 K and a T 3 dependence is roughly followed from just above T c (~10K) to ~40K. Anisotropic H c2(T) data were measured up to 140 kOe with field applied along and perpendicular to the rodlike crystals. For the applied field perpendicular to the rod, H c2(T) is linear with a slope ~–70more » kOe/K. For field applied along the rod, the slope is about –120 kOe/K below 70 kOe. Above 70 kOe, the magnitude of the slope decreases to ~–70 kOe/K. The electronic specific heat coefficient γ, just above T c, is 73 mJ/mol K 2; the Debye temperature Θ D is 220 K. As a result, the specific heat jump at the superconducting transition ΔC~2.2γT c. Finally, for hydrostatic pressures up to ~7 kbar, T c decreases under pressure linearly at a rate of –0.034K/kbar.« less