Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 90, Issue 10, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.90.103702
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Funding
- KAKENHI [JP15H05884, JP15H05882, JP15K21732, JP16H04006, JP15H05745, JP19H00646, JP20K03854, JP20K20889, JP20H00130, JP20KK0061]
- Precise Measurement Technology Promotion Foundation (PMTP-F)
- ICC-IMR
- ERC starting grant (NewHeavyFermion)
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This study investigates the metamagnetic transitions in the novel spin-triplet superconductor UTe2, where reentrant superconductivity is detected. The field dependence of the Sommerfeld coefficient gamma through the first-order metamagnetic transition is obtained. Effective mass towards Hm is significantly enhanced in both field directions, playing a crucial role in reentrant superconductivity.
In this study, the metamagnetic transitions in the novel spin-triplet superconductor UTe2 are investigated based on the recently developed simultaneous measurements of magnetization and sample temperature for the applied field along the orthorhombic b-axis and close to the [011] direction, where reentrant superconductivity (RSC) is detected below and above the first-order metamagnetic transition field H-m. Combining Maxwell's relation and the Clausius-Clapeyron equation, we obtain the field dependence of the Sommerfeld coefficient gamma through the first-order metamagnetic transition. A significant enhancement in the effective mass toward Hm is detected in both field directions. In contrast, above Hm, the effective mass discontinuously decreases for H parallel to b, while it discontinuously increases for H parallel to similar to[011], which plays a crucial role in the RSC.
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