擬二次元有機超伝導体の渦糸ダイナミクスと超伝導ギャップ構造

URI http://harp.lib.hiroshima-u.ac.jp/it-hiroshima/metadata/12292
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Title
擬二次元有機超伝導体の渦糸ダイナミクスと超伝導ギャップ構造
Title Alternative
Interplay between vortex dynamics and superconducting gap structure in quasi-two-dimensional organic superconductors
Author
氏名 安塚 周磨
ヨミ ヤスズカ シュウマ
別名 Yasuzuka Syuma
Subject
organic superconductor
gap structure
pairing symmetry
flux-flow resistance
Doppler energy shift
Abstract

Over the past three decades, unconventional superconductivity with anisotropic gap structure has been found in strongly correlated electron systems such as heavy fermion compounds, high Tc cuprates, and organic conductors. Unconventional superconductivity is characterized by anisotropic superconducting gap, which may have zeros (nodes) along certain directions in the Brillouin zone. The nodal structure is closely related to the pairing interaction, and it is widely believed that the presence of nodes is a signature of magnetic or some other exotic, rather than conventional phonon mediated, pairing mechanism. Thus, experimental determination of the gap function is of fundamental importance. However, the detailed gap structure is an unresolved issue for many unconventional superconductors. In this context, we have demonstrated for layered organic superconductors that flux-flow resistance under a magnetic field rotated within conducting layers provide a clue for determining the nodal directions. Here we present the experimental results for the angular variation of the flux-flow resistance in d-wave organic superconductors β”-(ET)2SF5CH2CF2SO3 and λ-(BETS)2GaCl4. Nodal structures for these superconductors are briefly discussed.

Journal Title
広島工業大学紀要. 研究編
Volume
53
Spage
191
Epage
197
Published Date
2019-02
Publisher
広島工業大学
ISSN
1346-9975
NCID
AA11599110
Language
jpn
NIIType
Departmental Bulletin Paper
Text Version
出版社版
Rights
publisher
Set
it-hiroshima