Vortex structure in weak to strong coupling superconductors: Crossover from BCS to BEC

Masahiko Machida; Tomio Koyama; Yoji Ohashi

doi:10.1016/j.physc.2006.03.113

Vortex structure in weak to strong coupling superconductors: Crossover from BCS to BEC

Masahiko Machida, Tomio Koyama, Yoji Ohashi

Research output: Contribution to journal › Article › peer-review

Abstract

High-T_c cuprate and MgB₂ superconductors are recognized as intermediate or strong coupling superconductors. In such a non-weak regime, the vortex core structure is an interesting issue, since the vortex dissipation is expected to be anomalously reduced due to large level distance between localized core states. In this paper, we systematically clarify the vortex core structure based on the fermion-boson model which can cover a full coupling range from weak BCS to strong BEC superconductors. The mean-field calculations on the model reveal that the distances between the low-lying core levels expand and the low-lying states finally disappear when changing the coupling from weak BCS to strong BEC regime. This result suggests that the strong coupling makes the vortex motion non-dissipative.

Original language	English
Pages (from-to)	194-197
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	445-448
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physc.2006.03.113
Publication status	Published - 2006 Oct 1
Externally published	Yes

Keywords

BCS-BEC crossover
Fermion-boson model
Vortex core
Vortex dissipation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2006.03.113

Cite this

@article{c5af40f63fdd4763a7c1acfef6e08ed3,

title = "Vortex structure in weak to strong coupling superconductors: Crossover from BCS to BEC",

abstract = "High-Tc cuprate and MgB2 superconductors are recognized as intermediate or strong coupling superconductors. In such a non-weak regime, the vortex core structure is an interesting issue, since the vortex dissipation is expected to be anomalously reduced due to large level distance between localized core states. In this paper, we systematically clarify the vortex core structure based on the fermion-boson model which can cover a full coupling range from weak BCS to strong BEC superconductors. The mean-field calculations on the model reveal that the distances between the low-lying core levels expand and the low-lying states finally disappear when changing the coupling from weak BCS to strong BEC regime. This result suggests that the strong coupling makes the vortex motion non-dissipative.",

keywords = "BCS-BEC crossover, Fermion-boson model, Vortex core, Vortex dissipation",

author = "Masahiko Machida and Tomio Koyama and Yoji Ohashi",

year = "2006",

month = oct,

day = "1",

doi = "10.1016/j.physc.2006.03.113",

language = "English",

volume = "445-448",

pages = "194--197",

journal = "Physica C: Superconductivity and its applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - Vortex structure in weak to strong coupling superconductors

T2 - Crossover from BCS to BEC

AU - Machida, Masahiko

AU - Koyama, Tomio

AU - Ohashi, Yoji

PY - 2006/10/1

Y1 - 2006/10/1

N2 - High-Tc cuprate and MgB2 superconductors are recognized as intermediate or strong coupling superconductors. In such a non-weak regime, the vortex core structure is an interesting issue, since the vortex dissipation is expected to be anomalously reduced due to large level distance between localized core states. In this paper, we systematically clarify the vortex core structure based on the fermion-boson model which can cover a full coupling range from weak BCS to strong BEC superconductors. The mean-field calculations on the model reveal that the distances between the low-lying core levels expand and the low-lying states finally disappear when changing the coupling from weak BCS to strong BEC regime. This result suggests that the strong coupling makes the vortex motion non-dissipative.

AB - High-Tc cuprate and MgB2 superconductors are recognized as intermediate or strong coupling superconductors. In such a non-weak regime, the vortex core structure is an interesting issue, since the vortex dissipation is expected to be anomalously reduced due to large level distance between localized core states. In this paper, we systematically clarify the vortex core structure based on the fermion-boson model which can cover a full coupling range from weak BCS to strong BEC superconductors. The mean-field calculations on the model reveal that the distances between the low-lying core levels expand and the low-lying states finally disappear when changing the coupling from weak BCS to strong BEC regime. This result suggests that the strong coupling makes the vortex motion non-dissipative.

KW - BCS-BEC crossover

KW - Fermion-boson model

KW - Vortex core

KW - Vortex dissipation

UR - http://www.scopus.com/inward/record.url?scp=33748621459&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33748621459&partnerID=8YFLogxK

U2 - 10.1016/j.physc.2006.03.113

DO - 10.1016/j.physc.2006.03.113

M3 - Article

AN - SCOPUS:33748621459

SN - 0921-4534

VL - 445-448

SP - 194

EP - 197

JO - Physica C: Superconductivity and its applications

JF - Physica C: Superconductivity and its applications

IS - 1-2

ER -

Vortex structure in weak to strong coupling superconductors: Crossover from BCS to BEC

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this