Magneto-optical observations of vortices in anisotropic and nanostructured superconductors

T. Tamegai; H. Chiku; Y. Tsuchiya; H. Shibutani; Y. Nakajima

doi:10.1016/j.physc.2007.11.072

Magneto-optical observations of vortices in anisotropic and nanostructured superconductors

T. Tamegai, H. Chiku, Y. Tsuchiya, H. Shibutani, Y. Nakajima

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

Abstract

Magneto-optical imaging technique is applied to visualize vortex distribution in superconducting networks and in highly anisotropic superconductor Bi₂Sr₂CaCu₂O_8+y under tilted magnetic fields. We have succeeded in visualizing the vortex distribution in a finite-size superconducting network with the unit cell size as small as 6 × 6 μm². We have also visualized the ratchet effect of pancake vortices induced by the time-asymmetric motion of Josephson vortices. The ratchet effect appears most clearly at the similar condition as the vortex lensing effect. The ratchet efficiency diminishes strongly as a function of frequency and it is almost completely suppressed above 1 kHz. Such a strong frequency dependence of the vortex ratchet effect is discussed based on the skin effect controlled by c-axis resistivity.

Original language	English
Pages (from-to)	531-536
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	468
Issue number	7-10
DOIs	https://doi.org/10.1016/j.physc.2007.11.072
Publication status	Published - 2008 Apr 1
Externally published	Yes

Keywords

BiSrCaCuO
Crossing lattices
Superconducting network
Vortex ratchet

ASJC Scopus subject areas

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

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10.1016/j.physc.2007.11.072

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@article{b24b036658924f659bb535a246d888ec,

title = "Magneto-optical observations of vortices in anisotropic and nanostructured superconductors",

abstract = "Magneto-optical imaging technique is applied to visualize vortex distribution in superconducting networks and in highly anisotropic superconductor Bi2Sr2CaCu2O8+y under tilted magnetic fields. We have succeeded in visualizing the vortex distribution in a finite-size superconducting network with the unit cell size as small as 6 × 6 μm2. We have also visualized the ratchet effect of pancake vortices induced by the time-asymmetric motion of Josephson vortices. The ratchet effect appears most clearly at the similar condition as the vortex lensing effect. The ratchet efficiency diminishes strongly as a function of frequency and it is almost completely suppressed above 1 kHz. Such a strong frequency dependence of the vortex ratchet effect is discussed based on the skin effect controlled by c-axis resistivity.",

keywords = "BiSrCaCuO, Crossing lattices, Superconducting network, Vortex ratchet",

author = "T. Tamegai and H. Chiku and Y. Tsuchiya and H. Shibutani and Y. Nakajima",

note = "Funding Information: This work is supported by Mitsubishi Foundation and a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology.",

year = "2008",

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doi = "10.1016/j.physc.2007.11.072",

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

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number = "7-10",

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TY - JOUR

T1 - Magneto-optical observations of vortices in anisotropic and nanostructured superconductors

AU - Tamegai, T.

AU - Chiku, H.

AU - Tsuchiya, Y.

AU - Shibutani, H.

AU - Nakajima, Y.

N1 - Funding Information: This work is supported by Mitsubishi Foundation and a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - Magneto-optical imaging technique is applied to visualize vortex distribution in superconducting networks and in highly anisotropic superconductor Bi2Sr2CaCu2O8+y under tilted magnetic fields. We have succeeded in visualizing the vortex distribution in a finite-size superconducting network with the unit cell size as small as 6 × 6 μm2. We have also visualized the ratchet effect of pancake vortices induced by the time-asymmetric motion of Josephson vortices. The ratchet effect appears most clearly at the similar condition as the vortex lensing effect. The ratchet efficiency diminishes strongly as a function of frequency and it is almost completely suppressed above 1 kHz. Such a strong frequency dependence of the vortex ratchet effect is discussed based on the skin effect controlled by c-axis resistivity.

AB - Magneto-optical imaging technique is applied to visualize vortex distribution in superconducting networks and in highly anisotropic superconductor Bi2Sr2CaCu2O8+y under tilted magnetic fields. We have succeeded in visualizing the vortex distribution in a finite-size superconducting network with the unit cell size as small as 6 × 6 μm2. We have also visualized the ratchet effect of pancake vortices induced by the time-asymmetric motion of Josephson vortices. The ratchet effect appears most clearly at the similar condition as the vortex lensing effect. The ratchet efficiency diminishes strongly as a function of frequency and it is almost completely suppressed above 1 kHz. Such a strong frequency dependence of the vortex ratchet effect is discussed based on the skin effect controlled by c-axis resistivity.

KW - BiSrCaCuO

KW - Crossing lattices

KW - Superconducting network

KW - Vortex ratchet

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JO - Physica C: Superconductivity and its Applications

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IS - 7-10

ER -

Magneto-optical observations of vortices in anisotropic and nanostructured superconductors

Abstract

Keywords

ASJC Scopus subject areas

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