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• W2898866835 abstract "The iron-based superconductor $mathrm{Rb}mathrm{Eu}{mathrm{Fe}}_{4}{mathrm{As}}_{4}$ undergoes a magnetic phase transition deep in the superconducting state. We investigate the calorimetric response of $mathrm{Rb}mathrm{Eu}{mathrm{Fe}}_{4}{mathrm{As}}_{4}$ 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. 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." @default.
• W2898866835 created "2018-11-09" @default.
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• W2898866835 date "2019-05-23" @default.
• W2898866835 modified "2023-10-18" @default.
• W2898866835 title "Strongly fluctuating moments in the high-temperature magnetic superconductor <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>RbEuFe</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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• W2898866835 doi "https://doi.org/10.1103/physrevb.99.180502" @default.
• W2898866835 hasPublicationYear "2019" @default.
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