Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State
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概要
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We report ac magnetic susceptibility and dc magnetization measurements on the superconducting ferromagnet UCoGe (with superconducting and Curie temperatures of $T_{\text{SC}}\sim 0.5$ K and $T_{\text{Curie}}\sim 2.5$ K, respectively). In the normal, ferromagnetic state ($T_{\text{SC}} < T < T_{\text{Curie}}$), the magnetization curve exhibits a hysteresis loop similar to that of a regular itinerant ferromagnet. Upon lowering the temperature below $T_{\text{SC}}$, the spontaneous magnetization is unchanged, but the hysteresis is markedly enhanced. Even deeply inside the superconducting state, ferromagnetism is not completely shielded, and there is no Meissner region, a magnetic field region of $H < H_{\text{c1}}$ (a lower critical field). From these results, we suggest that UCoGe is the first material in which ferromagnetism robustly survives in the superconducting state and a spontaneous vortex state without the Meissner state is realized.
- 2010-08-15
著者
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Deguchi Kazuhiko
Department Of Physics Graduate School Of Science Kyoto University
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Toshiro Sakakibara
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Osaki Eisuke
Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Eisuke Osaki
Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Isamu Satoh
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Ban Seiko
Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Nobuyuki Tamura
Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Yasuyuki Simura
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Noriaki K.
Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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