Thermodynamic signatures of short-range magnetic correlations in UTe2

Kristin Willa; Frédéric Hardy; Dai Aoki; Dexin Li; Paul Wiecki; Gérard Lapertot; Christoph Meingast

doi:10.1103/PhysRevB.104.205107

Thermodynamic signatures of short-range magnetic correlations in UTe2

Kristin Willa, Frédéric Hardy, Dai Aoki, Dexin Li, Paul Wiecki, Gérard Lapertot, Christoph Meingast

Materials Processing and Characterization Division

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The normal state out of which unconventional superconductivity in UTe2 emerges is studied in detail using a variety of thermodynamic and transport probes. Clear evidence for a broad Schottky-like anomaly with roughly Rln2 entropy around T∗≈12 K is observed in all measured quantities. Comparison with high magnetic field transport data allows the construction of an H-T phase diagram resembling that of the ferromagnetic superconductor URhGe. The low-field electronic Grüneisen parameter of T∗ and that of the metamagnetic transition at Hm≈35 T are comparable pointing to a common origin of both phenomena. Enhanced Wilson and Korringa ratios suggest that the existence of short-range ferromagnetic fluctuations cannot be ruled out.

Original language	English
Article number	205107
Journal	Physical Review B
Volume	104
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.104.205107
Publication status	Published - 2021 Nov 15

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.104.205107

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title = "Thermodynamic signatures of short-range magnetic correlations in UTe2",

abstract = "The normal state out of which unconventional superconductivity in UTe2 emerges is studied in detail using a variety of thermodynamic and transport probes. Clear evidence for a broad Schottky-like anomaly with roughly Rln2 entropy around T∗≈12 K is observed in all measured quantities. Comparison with high magnetic field transport data allows the construction of an H-T phase diagram resembling that of the ferromagnetic superconductor URhGe. The low-field electronic Gr{\"u}neisen parameter of T∗ and that of the metamagnetic transition at Hm≈35 T are comparable pointing to a common origin of both phenomena. Enhanced Wilson and Korringa ratios suggest that the existence of short-range ferromagnetic fluctuations cannot be ruled out.",

author = "Kristin Willa and Fr{\'e}d{\'e}ric Hardy and Dai Aoki and Dexin Li and Paul Wiecki and G{\'e}rard Lapertot and Christoph Meingast",

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AU - Willa, Kristin

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AU - Aoki, Dai

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AU - Wiecki, Paul

AU - Lapertot, Gérard

AU - Meingast, Christoph

N1 - Funding Information: We acknowledge stimulating discussions with K. Ishida, Georg Knebel, Daniel Braithwaite, Adrien Rosuel, and Jean-Pascal Brison. We thank William Knafo for providing his data and sharing valuable insights. K.W. acknowledges funding from the Swiss National Science Foundation through the Postdoc.mobility program. Work at KIT was partially funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—TRR 288-422213477 (project A2). Publisher Copyright: © 2021 American Physical Society.

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N2 - The normal state out of which unconventional superconductivity in UTe2 emerges is studied in detail using a variety of thermodynamic and transport probes. Clear evidence for a broad Schottky-like anomaly with roughly Rln2 entropy around T∗≈12 K is observed in all measured quantities. Comparison with high magnetic field transport data allows the construction of an H-T phase diagram resembling that of the ferromagnetic superconductor URhGe. The low-field electronic Grüneisen parameter of T∗ and that of the metamagnetic transition at Hm≈35 T are comparable pointing to a common origin of both phenomena. Enhanced Wilson and Korringa ratios suggest that the existence of short-range ferromagnetic fluctuations cannot be ruled out.

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Thermodynamic signatures of short-range magnetic correlations in UTe2

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