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Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4
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Number of Authors: 142018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, no 10, article id 104503Article in journal (Refereed) Published
Abstract [en]

We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe(4)As(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 superconducting phase diagram is characterized by high upper critical field slopes of -70 and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Gamma = 1.7. Ginzburg-Landau parameters of K-c similar to 67 and K-ab similar to 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 (2D), 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 kinklike 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 and 4 kG.

Place, publisher, year, edition, pages
2018. Vol. 98, no 10, article id 104503
National Category
Physical Sciences
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URN: urn:nbn:se:su:diva-160205DOI: 10.1103/PhysRevB.98.104503ISI: 000443672100005OAI: oai:DiVA.org:su-160205DiVA, id: diva2:1251120
Available from: 2018-09-26 Created: 2018-09-26 Last updated: 2018-09-26Bibliographically approved

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Diao, ZhuRydh, Andreas
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