Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe4As4

Willa, K.; Willa, R.; Bao, J. -K.; Koshelev, A. E.; Chung, D. Y.; Kanatzidis, M. G.; Kwok, W. -K.; Welp, U.

doi:10.1103/PhysRevB.99.180502

Title: Strongly fluctuating moments in the high-temperature magnetic superconductor ${RbEuFe}_{4} {As}_{4}$

Journal Article · Thu May 23 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.180502· OSTI ID:1526263

Willa, K. ^[1]; Willa, R. ^[1]; Bao, J. -K. ^[1]; Koshelev, A. E. ^[1]; Chung, D. Y. ^[1]; Kanatzidis, M. G. ^[2]; Kwok, W. -K. ^[1]; Welp, U. ^[1]

Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Northwestern Univ., Evanston, IL (United States)

The iron-based superconductor RbEuFe₄As₄ undergoes a magnetic phase transition deep in the superconducting state. In this work, we investigate the calorimetric response of RbEuFe₄As₄ single crystals of the magnetic and the superconducting phase and its anisotropy to in-plane and out-of-plane magnetic fields. Whereas the unusual cusplike anomaly associated with the magnetic transition is suppressed to lower temperatures for fields along the crystallographic c axis, it rapidly transforms to a broad shoulder shifting to higher temperatures for in-plane fields. We identify the cusp in the specific-heat data as a Berezinskii-Kosterlitz-Thouless transition with fine features caused by the three-dimensional effects. The high-temperature shoulder in high magnetic fields marks a crossover from a paramagnetically disordered to an ordered state. Lastly, this observation is further supported by Monte Carlo simulations of an easy-plane two-dimensional Heisenberg model and a fourth-order high-temperature expansion, both of which agree qualitatively and quantitatively with the experimental findings.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1526263

Alternate ID(s):: OSTI ID: 1515574

Journal Information:: Physical Review B, Vol. 99, Issue 18; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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