Microscopic Coexistence of Ferromagnetism and Superconductivity in Single-Crystal UCoGe
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概要
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Unambiguous evidence for the microscopic coexistence of ferromagnetism and superconductivity in UCoGe ($T_{\text{Curie}} \sim 2.5$ K and $T_{\text{SC}} \sim 0.6$ K) is reported from 59Co nuclear quadrupole resonance (NQR). The 59Co-NQR signal below 1 K indicates ferromagnetism throughout the sample volume, while the nuclear spin-lattice relaxation rate $1/T_{1}$ in the ferromagnetic (FM) phase decreases below $T_{\text{SC}}$ due to the opening of the superconducting (SC) gap. The SC state is found to be inhomogeneous, suggestive of a self-induced vortex state, potentially realizable in a FM superconductor. In addition, the 59Co-NQR spectrum around $T_{\text{Curie}}$ shows that the FM transition in UCoGe possesses a first-order character, which is consistent with the theoretical prediction that the low-temperature FM transition in itinerant magnets is generically of first-order.
- Physical Society of Japanの論文
- 2010-02-15
著者
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Satoh Isamu
Institute For Material Research Tohoku University
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Ohta Tetsuya
Department Of Physics Graduate School Of Science Kyoto University
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Nakai Yusuke
Department Of Materials Science And Engineering Graduate School Of Engineering Nagoya Institute Of T
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Deguchi Kazuhiko
Department Of Physics Graduate School Of Science Kyoto University
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Ishida Kenji
Department Of Chemical Science And Engineering Graduate School Of Engineering Kobe University
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Sato Noriaki
Department Of Electronics Faculty Of Engineering Nagoya University
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Ohta Tetsuya
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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Hattori Taisuke
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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Osaki Eisuke
Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Satoh Isamu
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Ishida Kenji
Department of Applied Chemistry, Ibaraki University
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Sato Noriaki
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology
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