Isotope Effect in Multi-Band and Multi-Channel Attractive Systems and Inverse Isotope Effect in Iron-Based Superconductors
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概要
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Recently reported inverse isotope effect is investigated on the basis of the two-band and two-channel attractive model by using the weak coupling Bardeen–Cooper–Schrieffer (BCS) scheme. If we assume the several attractive or repulsive interactions for Cooper pairs, which works in different energy ranges, the isotope exponent $\alpha$ takes values even in the range of $\alpha<0$ (negative) and $\alpha>0.5$, depending on the strength and the range of interactions. We apply the theory to recently observed remarkable inverse isotope effect $\alpha\approx-0.18$ for the Fe-pnictide (Ba,K)Fe2As2 superconductor. The large inverse isotope effect naturally originates from the competition between the magnetically induced pair interaction and the inter-band electron–phonon coupling. It evidently indicates that the superconductivity in Fe pnictides arises from the magnetically induced attractive interaction.
- 2009-09-15
著者
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Hase Izumi
Nanoelectronics Research Institute Aist
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Iyo Akira
Nanoelectronics Research Institute (neri) National Institute Of Advanced Industrial Science And Tech
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Eisaki Hiroshi
Nanoelectronics Research Institute (neri) National Institute Of Advanced Industrial Science And Tech
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Shirage Parasharam
Nanoelectronics Research Institute (neri) National Institute Of Advanced Industrial Science And Tech
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Yamaji Kunihiko
Nanoelectronics Research Institute Aist
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Yanagisawa Takashi
Nanoelectronics Research Institute
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Tanaka Yasumoto
Nanoelectronics Research Institute (NeRI), National Institute of Advanced Industrial Science and Technology (AIST), Central 2, Tsukuba, Ibaraki 305-8568, Japan
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Shirage Parasharam
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568
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Iyo Akira
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568
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Odagiri Kosuke
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568
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Tanaka Yasumoto
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568
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