TY - JOUR
T1 - Observation of longitudinal magnetic fluctuations at a first-order ferromagnetic quantum phase transition in UGe2
AU - Noma, Yuichiro
AU - Kotegawa, Hisashi
AU - Kubo, Tetsuro
AU - Tou, Hideki
AU - Harima, Hisatomo
AU - Haga, Yoshinori
AU - Yamamoto, Etsuji
AU - Onuki, Yoshichika
AU - Itoh, Kohei M.
AU - Nakamura, Ai
AU - Homma, Yoshiya
AU - Honda, Fuminori
AU - Aoki, Dai
N1 - Funding Information:
Acknowledgment We thank K. Ishida, M. Manago, Y. Tokunaga, V. Taufor, and J. Flouquet for helpful discussions, and E. E. Haller for experimental support. This work was supported by JSPS KAKENHI Grants [Nos. 15H05885, 15H05882, 18H04321 (J-Physics), and 15H05745].
Publisher Copyright:
© 2021 Physical Society of Japan. All rights reserved.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - The connection between ferromagnetic (FM) fluctuations and superconductivity has been well established in FM superconductors UCoGe and URhGe. However, this connection has not been clarified in UGe2, in which pressureinduced superconductivity emerges in the FM phase. We show results focusing on the spin-echo decay rate, 1=T2, obtained using 73Ge-nuclear magnetic resonance (NMR) under pressure, which reveals longitudinal magnetic fluctuations in UGe2. These fluctuations originate in a FM critical point located at a nonzero temperature and developed near the first-order FM quantum phase transition. This remarkable feature at the high-pressure side, where a superconducting anomaly has been clearly observed, provides a connection of FM fluctuations and superconductivity in UGe2. This strongly supports a consensus that superconductivity in ferromagnets is universally mediated by anisotropic magnetic fluctuations.
AB - The connection between ferromagnetic (FM) fluctuations and superconductivity has been well established in FM superconductors UCoGe and URhGe. However, this connection has not been clarified in UGe2, in which pressureinduced superconductivity emerges in the FM phase. We show results focusing on the spin-echo decay rate, 1=T2, obtained using 73Ge-nuclear magnetic resonance (NMR) under pressure, which reveals longitudinal magnetic fluctuations in UGe2. These fluctuations originate in a FM critical point located at a nonzero temperature and developed near the first-order FM quantum phase transition. This remarkable feature at the high-pressure side, where a superconducting anomaly has been clearly observed, provides a connection of FM fluctuations and superconductivity in UGe2. This strongly supports a consensus that superconductivity in ferromagnets is universally mediated by anisotropic magnetic fluctuations.
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U2 - 10.7566/JPSJ.90.073707
DO - 10.7566/JPSJ.90.073707
M3 - Article
AN - SCOPUS:85109424705
SN - 0031-9015
VL - 90
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 7
M1 - 073707
ER -