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Charged vortices in high-temperature superconductors probed by NMR

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Title: Charged vortices in high-temperature superconductors probed by NMR
Authors: Kumagai, Ken-ichi1 Browse this author →KAKEN DB
Nozaki, Koji Browse this author
Matsuda, Yuji Browse this author
Authors(alt): 熊谷, 健一1
Issue Date: 2001
Publisher: American Physical Society
Volume: 63
Start Page: 144502
Publisher DOI: 10.1103/PhysRevB.63.144502
Abstract: We report experimental evidence that a vortex in high-temperature superconductors (HTSC) traps a finite electric charge from the high-resolution measurements of the nuclear quadrupole frequencies. In slightly overdoped YBa2Cu3O7 the vortex is negatively charged by trapping electrons, while in underdoped YBa2Cu4O8 it is positively charged by expelling electrons. The sign of the trapped charge is opposite to the sign predicted by the conventional BCS theory. Moreover, in both materials, the deviation of the magnitude of charge from the theory is also significant. These unexpected features can be attributed to the electronic structure of the vortex in HTSC.
Rights: Copyright © 2001 American Physical Society
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 熊谷 健一

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