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Effects of pressure and magnetic field on superconductivity in ZrTe3: local pair-induced superconductivity

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Title: Effects of pressure and magnetic field on superconductivity in ZrTe3: local pair-induced superconductivity
Authors: Tsuchiya, S. Browse this author
Matsubayashi, K. Browse this author
Yamaya, K. Browse this author
Takayanagi, S. Browse this author
Tanda, S. Browse this author
Uwatoko, Y. Browse this author
Keywords: superconductivity
magnetic field
Issue Date: Jun-2017
Publisher: IOP Publishing
Journal Title: New Journal of Physics
Volume: 19
Start Page: 63004
Publisher DOI: 10.1088/1367-2630/aa6d48
Abstract: In this work, the origin of the highly anisotropic superconducting transition in ZrTe3, where the resistance along the a axis, Ra, is reduced at 4 K but those along the b axis, R-b, and c ' axis, R-c ', are reduced at 2 K, was explored with the application of a magnetic field and pressure by the electrical resistance measurements. We found that the behavior of the upper critical field and its anisotropy as well as the pressure dependence determined by the Ra measurements are quite similar to those of Rb. Moreover, the excess conductivity for Rb indicates anomalous behavior. These results support an unconventional origin for the anisotropic transition rather than conventional superconducting fluctuation. The reduction in Ra is due to filamentary superconductivity. (SC) induced by locally bound electron pairs (local pairs), which correspond to bi-polarons, and the transition of Rb corresponds to the emergence of bulk SC originating from the Cooper pairs triggered by the transfer of the local pairs.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 土屋 聡

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