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Thermal expansion and magnetostriction of UTe2

Kristin, Willa

Abstract (englisch):
The normal electronic-state out of which unconventional superconductivity in UTe2 emerges, is studied using anisotropic high-resolution thermal expansion, magnetostriction, heat-capacity, magnetization and resistivity measurements. Clear thermodynamic signatures of a broad anomaly around 12 K is found in all measurements, and the scaling of the resistivity with the specific heat suggests short-ranged magnetic fluctuations as the origin. We were able follow this ‘12 K anomaly’ to high-fields using previously published resistivity data [Knafo et al. arXiv:2007.06009], and the resulting H-T phase diagram for all three field directions is very reminiscent of other ferromagnetic U-based superconductors. Additionally, thermal expansion and magnetostriction predict the largest pressure effect for c-axis uniaxial pressure and a suppression of the 12 K anomaly with pressure. The electronic Grüneisen parameter is found to take on a moderately large value of around -30.



Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Vortrag
Publikationsdatum 16.03.2021
Sprache Englisch
Identifikator KITopen-ID: 1000131794
HGF-Programm 43.21.01 (POF IV, LK 01) Quantum Correlations in Condensed Matter
Veranstaltung APS March Meeting (2021), Online, 15.03.2021 – 19.03.2021
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