Anisotropic upper critical field of pristine and proton-irradiated single crystals of the magnetically ordered superconductor RbEuFe{sub 4}As{sub 4

Smylie, M. P.; Koshelev, A. E.; Willa, K.; Willa, R.; Kwok, W. -K.; Bao, J. -K.; Chung, D. Y.; Kanatzidis, M. G.; Singleton, J.; Balakirev, F. F.; Hebbeker, H.; Niraula, P.; Bokari, E.; Kayani, A.; Welp, U.

doi:10.1103/PhysRevB.100.054507

Anisotropic upper critical field of pristine and proton-irradiated single crystals of the magnetically ordered superconductor RbEuFe{sub 4}As{sub 4

Journal Article · 07 August 2019 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.100.054507· OSTI ID:1558615

Smylie, M. P.; Koshelev, A. E.; Willa, K.; Willa, R.; Kwok, W. -K.; Bao, J. -K.; Chung, D. Y.; Kanatzidis, M. G.; Singleton, J.; Balakirev, F. F.; Hebbeker, H.; Niraula, P.; Bokari, E.; Kayani, A.; Welp, U.

We present a study of the upper critical field H-c2 of pristine and proton-irradiated RbEuFe4As4 crystals in pulsed magnetic fields of up to 65 T. The data for H-c2 reveal pronounced downwards curvature, particularly for the in-plane field orientation, and a superconducting anisotropy that decreases with decreasing temperature. These features are indicative of Pauli paramagnetic limiting. For the interpretation of these data, we use a model of a clean single-band superconductor with an open Fermi surface in the shape of a warped cylinder, which takes into account Zeeman spin splitting. Fits to the data reveal that the in-plane upper critical field is Pauli paramagnetic limited, while the out-of-plane upper critical field is orbitally limited and that the orbital and paramagnetic fields have opposite anisotropies. A consequence of this particular combination is the unusual inversion of the anisotropy H-c2(ab) < H-c2(c) of the irradiated sample at temperatures below 10 K. The fits also yield an in-plane Maki parameter alpha(110)(M) approximate to 2.6 exceeding the critical value for the formation of the Fulde-Ferrell-Larkin-Ovchinnikov state. Nevertheless, the current measurements did not reveal direct evidence for the occurrence of this state.

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; Swiss National Science Foundation (SNSF); National Science Foundation (NSF)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1558615

Journal Information:: Physical Review, B: Condensed Matter, Vol. 100, Issue 5

Country of Publication:: United States

Language:: English

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