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Title: Anisotropic superconductivity and magnetism in single-crystal RbEuFe 4 As 4

Abstract

We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe{sub 4}As{sub 4} using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu-moments of T_m = 15 K and a superconducting transition temperature of T_c = 36.8 K. The supeconducting phase diagram is characterized by high upper critical field slopes of -70 kG/K and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Γ = 1.7. Ginzburg-Landau parameters of κ_c~67 and κ_ab~108 indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu-magnetism is quasi-two dimensional as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and < 0.04 K. A consequence of the quasi-2D nature of the Eu-magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a cusp-like anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 kG and 4 kG.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1472081
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Smylie, M. P., Willa, K., Bao, J. -K., Ryan, K., Islam, Z., Claus, H., Simsek, Y., Diao, Z., Rydh, A., Koshelev, A. E., Kwok, W. -K., Chung, D. Y., Kanatzidis, M. G., and Welp, U. Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.104503.
Smylie, M. P., Willa, K., Bao, J. -K., Ryan, K., Islam, Z., Claus, H., Simsek, Y., Diao, Z., Rydh, A., Koshelev, A. E., Kwok, W. -K., Chung, D. Y., Kanatzidis, M. G., & Welp, U. Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4. United States. doi:10.1103/PhysRevB.98.104503.
Smylie, M. P., Willa, K., Bao, J. -K., Ryan, K., Islam, Z., Claus, H., Simsek, Y., Diao, Z., Rydh, A., Koshelev, A. E., Kwok, W. -K., Chung, D. Y., Kanatzidis, M. G., and Welp, U. Sat . "Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4". United States. doi:10.1103/PhysRevB.98.104503.
@article{osti_1472081,
title = {Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4},
author = {Smylie, M. P. and Willa, K. and Bao, J. -K. and Ryan, K. and Islam, Z. and Claus, H. and Simsek, Y. and Diao, Z. and Rydh, A. and Koshelev, A. E. and Kwok, W. -K. and Chung, D. Y. and Kanatzidis, M. G. and Welp, U.},
abstractNote = {We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe{sub 4}As{sub 4} using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu-moments of T_m = 15 K and a superconducting transition temperature of T_c = 36.8 K. The supeconducting phase diagram is characterized by high upper critical field slopes of -70 kG/K and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Γ = 1.7. Ginzburg-Landau parameters of κ_c~67 and κ_ab~108 indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu-magnetism is quasi-two dimensional as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and < 0.04 K. A consequence of the quasi-2D nature of the Eu-magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a cusp-like anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 kG and 4 kG.},
doi = {10.1103/PhysRevB.98.104503},
journal = {Physical Review B},
issn = {2469-9950},
number = 10,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

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