研究者詳細 - 市岡　優典

論文 - 市岡　優典

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Star-shaped local density of states around vortices in a type-II superconductor 査読

N Hayashi, M Ichioka, K Machida

PHYSICAL REVIEW LETTERS 77 ( 19 ) 4074 - 4077 1996年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMERICAN PHYSICAL SOC

The electronic structure of vortices in a type II superconductor is analyzed within the quasiclassical Eilenberger framework. The possible origin of a sixfold ''star'' shape of the local density of states, observed by scanning tunneling microscope (STM) experiments on NbSe2, is examined in the light of the three effects: the anisotropic pairing, the vortex lattice, and the anisotropic density of states at the Fermi surface. Outstanding features of split parallel rays of this star are well explained in terms of an anisotropic s-wave pairing. This reveals not only a rich internal electronic structure associated with a vortex core, but also unique ability of the STM spectroscopy.

DOI： 10.1103/PhysRevLett.77.4074

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Vortex structure in d-wave superconductors 査読

M Ichioka, N Hayashi, N Enomoto, K Machida

PHYSICAL REVIEW B 53 ( 22 ) 15316 - 15326 1996年6月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMERICAN PHYSICAL SOC

The vortex structure of pure d(x2-y2)-wave superconductors is microscopically analyzed in the framework of the quasiclassical Eilenberger equations. A self-consistent solution for the d-wave pair potential is obtained in the case of an isolated vortex. The vortex core structure, i.e., the pair potential, the supercurrent, and the magnetic field, is found to be fourfold symmetric even in the case that the mixing of the s-wave component is absent. The detailed temperature dependences of these quantities are calculated. The fourfold symmetry becomes clear when the temperature is decreased. The local density of states is calculated for the self-consistently obtained pair potential. From the results, we discuss the flow trajectory of the quasiparticles around a vortex, which is characteristic in d(x2-y2)-wave superconductors. The experimental relevance of our results to high-temperature superconductors is also given.

DOI： 10.1103/PhysRevB.53.15316

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Vortex core structure and possible pairing mixture in d-wave superconductors 査読

K Machida, M Ichioka, N Hayashi, N Enomoto

PHYSICA C 263 ( 1-4 ) 428 - 430 1996年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

The vortex core structure in a d-wave superconductor is analyzed by solving the quasi-classical Eilenberger equation self-consistently. The pair function, current and magnetic field distributions around an isolated vortex are found to break circular symmetry and show four-fold symmetry, reflecting the internal degrees of freedom in d-wave pairing.

DOI： 10.1016/0921-4534(95)00823-3

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s- and d(xy)-wave components induced around a vortex in d(x(2)-y(2))-wave superconductors 査読

M Ichioka, N Enomoto, N Hayashi, K Machida

PHYSICAL REVIEW B 53 ( 5 ) 2233 - 2236 1996年2月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMERICAN PHYSICAL SOC

The vortex structure of d(x2-y2)-wave superconductors is microscopically analyzed in the framework of the quasiclassical Eilenberger equations. If the pairing interaction contains an s-wave (d(xy)-wave) component in addition to a d(x2-y2)-wave component, the s-wave (d(xy)-wave) component of the order parameter is necessarily induced around a vortex in d(x2-y2)-wave superconductors. The spatial distribution of the induced s-wave and d(xy)-wave components is calculated. The s-wave component has an opposite winding number around the vortex near the d(x2-y2)-vortex core and its amplitude has the shape of a four-lobe clover. These are consistent with results based on the Ginzburg-Landau (GL) theory. The amplitude of the d(xy) component has the shape of an octofoil. The mixing of the d(xy) component cannot be explained by the GL theory, unless nonlocal correction terms are included.

DOI： 10.1103/PhysRevB.53.2233

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VORTEX LATTICE OF LAYERED SUPERCONDUCTORS IN PARALLEL MAGNETIC-FIELDS 査読

M ICHIOKA

PHYSICAL REVIEW B 51 ( 14 ) 9423 - 9426 1995年4月

Fundamental Properties of a Vortex in a d-wave Superconductor (共著) 査読

ICHIOKA M, HAYASHI N, ENOMOTO N, MACHIDA K

Journal of the Physical Society of Japan 64 ( 12 ) 4547 - 4551 1995年

Collective Mode in Two-Band Superconductor : Condensed Matter and Statistical Physics 査読

Ichioka Masanori, Department of Physics Kyoto University

Progress of theoretical physics = Progress of theoretical physics 90 ( 3 ) 513 - 519 1993年9月

担当区分：筆頭著者記述言語：英語出版者・発行元：Published for the Research Institute for Fundamental Physics by Physical Society of Japan

Collective mode in two-band superconductor is investigated. The s-wave and d-wave modes in s-wave superconducting state are considered. We show the eigen-frequency of these modes as a function of temperature and the softening of the d-wave mode at the onset temperature of d-wave superconductivity.

DOI： 10.1143/PTP.90.513

CiNii Article

CiNii Books

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その他リンク： https://projects.repo.nii.ac.jp/?action=repository_uri&item_id=350956

SUPERCONDUCTIVITY IN 2-BAND MODEL

Masanori Ichioka

Progress of Theoretical Physics 1993年

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