Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe$_2$
| Autor: | Tokiwa, Y., Opletal, . P., Sakai, H., Kambe, S., Yamamoto, E., Kimata, M., Awaji, S., Sasaki, T., Aoki, D., Haga, Y., Tokunaga, Y. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 109, L140502 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.109.L140502 |
| Popis: | The normal-conducting state of the superconductor UTe$_2$ is studied by entropy analysis for magnetic fields along the $b$-axis, obtained from magnetization using the relation $(\partial M/\partial T)_B=(\partial S/\partial B)_T$. We observe a strong increase in entropy with magnetic field due to metamagnetic fluctuations (spatially uniform, $Q=0$). The field dependence is well described by the Hertz-Millis-Moriya theory for quantum criticality of itinerant metamagnetism. Notably, the lower bound of the quantum-critical region coincides well with the position of the minimum in the superconducting transition temperature $T_c(B)$. Hence, our results suggest that $Q=0$ fluctuations reinforce the superconductivity. Comment: accepted as a Letter in Phys. Rev. B |
| Databáze: | arXiv |
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