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arXiv · 2105.08593

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2

Dexin Li·Ai Nakamura·Fuminori Honda·Yoshiki J. Sato·Yoshiya Homma·Yusei Shimizu·Jun Ishizuka·Youichi Yanase·Georg Knebel·Jacques Flouquet·Dai Aoki
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Abstract

We report the magnetic susceptibility and the magnetization under pressures up to 1.7GPa above the critical pressure, Pc ~ 1.5GPa, for H // a, b, c-axes in the novel spin triplet superconductor UTe2. The anisotropic magnetic susceptibility at low pressure with the easy magnetization a-axis changes to the quasi-isotropic behavior at high pressure, revealing a rapid suppression of the susceptibility for a-axis, and a gradual increase of the susceptibility for the b-axis. At 1.7GPa above Pc, magnetic anomalies are detected at T_MO ~ 3K and T_WMO ~ 10K. The former anomaly corresponds to long-range magnetic order, most likely antiferromagnetism, while the latter shows a broad anomaly, which is probably due to the development of short range order. The unusual decrease and increase of the susceptibility below T_WMO for H // a and b-axes, respectively, indicate the complex magnetic properties at low temperatures above Pc. This is related to the interplay between multiple fluctuations dominated by antiferromagnetism, ferroamgnetism, valence and Fermi surface instabilities.

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Dexin Li, Ai Nakamura, Fuminori Honda, Yoshiki J. Sato, Yoshiya Homma, Yusei Shimizu, Jun Ishizuka, Youichi Yanase, Georg Knebel, Jacques Flouquet, Dai Aoki. 2021-05-18. Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2. https://doi.org/10.7566/jpsj.90.073703

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