Ferromagnetic Quantum Critical Fluctuations and Anomalous Coexistence of Ferromagnetism and Superconductivity in UCoGe Revealed by Co-NMR and NQR Studies
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- Ohta Tetsuya
- Department of Physics, Graduate School of Science, Kyoto University
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- Nakai Yusuke
- Department of Physics, Graduate School of Science, Kyoto University
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- Ihara Yoshihiko
- Department of Physics, Graduate School of Science, Kyoto University
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- Ishida Kenji
- Department of Physics, Graduate School of Science, Kyoto University
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- Deguchi Kazuhiko
- Department of Physics, Graduate School of Science, Nagoya University
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- Sato Noriaki K.
- Department of Physics, Graduate School of Science, Nagoya University
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- Satoh Isamu
- Institute for Materials Research, Tohoku University
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Co nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies were carried out for the recently discovered UCoGe, in which the ferromagnetic and superconducting (SC) transitions are reported to occur at TCurie∼3 K and TS∼0.8 K [Huy et al.: Phys. Rev. Lett. 99 (2007) 067006], in order to investigate the coexistence of ferromagnetism and superconductivity as well as the normal-state and SC properties from a microscopic point of view. From the nuclear spin–lattice relaxation rate 1⁄T1 and Knight-shift measurements, we confirm that ferromagnetic fluctuations that possess a quantum critical character are present above TCurie and also the occurrence of a ferromagnetic transition at 2.5 K in our polycrystalline sample. The magnetic fluctuations in the normal state show that UCoGe is an itinerant ferromagnet similar to ZrZn2 and YCo2. The onset SC transition is identified at TS∼0.7 K, below which 1⁄T1 arising from 30% of the volume fraction starts to decrease due to the opening of the SC gap. This component of 1⁄T1, which follows a T3 dependence in the temperature range 0.3–0.1 K, coexists with the magnetic components of 1⁄T1 showing a \\sqrtT dependence below TS. From the NQR measurements in the SC state, we suggest that the self-induced vortex state is realized in UCoGe.
収録刊行物
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- Ｊｏｕｒｎａｌ ｏｆ ｔｈｅ Ｐｈｙｓｉｃａｌ Ｓｏｃｉｅｔｙ ｏｆ Ｊａｐａｎ
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Ｊｏｕｒｎａｌ ｏｆ ｔｈｅ Ｐｈｙｓｉｃａｌ Ｓｏｃｉｅｔｙ ｏｆ Ｊａｐａｎ 77 (2), 023707-023707, 2008
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390282679175051904
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- NII論文ID
- 130005436319
- 110006613875
- 210000107082
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- NII書誌ID
- AA00704814
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 9377247
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
