Linear and non-linear ac response of the vortex matter in MgB2 single crystals

L. Lyard; T. Klein; J. Marcus; C. Marcenat; B. Kang; H. J. Kim; E. M. Choi; C. U. Jung; S. I. Lee

doi:10.1016/j.physc.2004.02.172

Linear and non-linear ac response of the vortex matter in MgB₂ single crystals

L. Lyard
, T. Klein
, J. Marcus
, C. Marcenat
, B. Kang
, H. J. Kim
, E. M. Choi
, C. U. Jung
, S. I. Lee

École Polytechnique

Research output: Contribution to journal › Conference article › peer-review

Abstract

The response of vortices to an ac excitation field (∥c) has been investigated in MgB₂ single crystals in both linear and non-linear regimes. Those high quality crystals exhibit very weak critical currents: J _c(H = 0.1T) ∼ a few 10³ A/cm² at low temperature. The field dependence of J_c is discussed in terms of the collective pinning theory. The Campbell penetration length (deduced from the linear response) varies linearly with H at low field as predicted for intra-valley oscillations for non-interacting vortices.

Original language	English
Pages (from-to)	93-94
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	408-410
Issue number	1-4
DOIs	https://doi.org/10.1016/j.physc.2004.02.172
Publication status	Published - 1 Aug 2004
Event	Proceedings of the International Conference on Materials - Rio de Janeiro, Brazil Duration: 25 May 2003 → 30 May 2003

Keywords

Critical current densities
MgB single crystal
Mixed state

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10.1016/j.physc.2004.02.172

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title = "Linear and non-linear ac response of the vortex matter in MgB2 single crystals",

abstract = "The response of vortices to an ac excitation field (∥c) has been investigated in MgB2 single crystals in both linear and non-linear regimes. Those high quality crystals exhibit very weak critical currents: J c(H = 0.1T) ∼ a few 103 A/cm2 at low temperature. The field dependence of Jc is discussed in terms of the collective pinning theory. The Campbell penetration length (deduced from the linear response) varies linearly with H at low field as predicted for intra-valley oscillations for non-interacting vortices.",

keywords = "Critical current densities, MgB single crystal, Mixed state",

author = "L. Lyard and T. Klein and J. Marcus and C. Marcenat and B. Kang and Kim, \{H. J.\} and Choi, \{E. M.\} and Jung, \{C. U.\} and Lee, \{S. I.\}",

year = "2004",

month = aug,

day = "1",

doi = "10.1016/j.physc.2004.02.172",

language = "English",

volume = "408-410",

pages = "93--94",

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

issn = "0921-4534",

number = "1-4",

note = "Proceedings of the International Conference on Materials ; Conference date: 25-05-2003 Through 30-05-2003",

}

TY - JOUR

T1 - Linear and non-linear ac response of the vortex matter in MgB2 single crystals

AU - Lyard, L.

AU - Klein, T.

AU - Marcus, J.

AU - Marcenat, C.

AU - Kang, B.

AU - Kim, H. J.

AU - Choi, E. M.

AU - Jung, C. U.

AU - Lee, S. I.

PY - 2004/8/1

Y1 - 2004/8/1

N2 - The response of vortices to an ac excitation field (∥c) has been investigated in MgB2 single crystals in both linear and non-linear regimes. Those high quality crystals exhibit very weak critical currents: J c(H = 0.1T) ∼ a few 103 A/cm2 at low temperature. The field dependence of Jc is discussed in terms of the collective pinning theory. The Campbell penetration length (deduced from the linear response) varies linearly with H at low field as predicted for intra-valley oscillations for non-interacting vortices.

AB - The response of vortices to an ac excitation field (∥c) has been investigated in MgB2 single crystals in both linear and non-linear regimes. Those high quality crystals exhibit very weak critical currents: J c(H = 0.1T) ∼ a few 103 A/cm2 at low temperature. The field dependence of Jc is discussed in terms of the collective pinning theory. The Campbell penetration length (deduced from the linear response) varies linearly with H at low field as predicted for intra-valley oscillations for non-interacting vortices.

KW - Critical current densities

KW - MgB single crystal

KW - Mixed state

UR - https://www.scopus.com/pages/publications/4444332788

U2 - 10.1016/j.physc.2004.02.172

DO - 10.1016/j.physc.2004.02.172

M3 - Conference article

AN - SCOPUS:4444332788

SN - 0921-4534

VL - 408-410

SP - 93

EP - 94

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1-4

T2 - Proceedings of the International Conference on Materials

Y2 - 25 May 2003 through 30 May 2003

ER -

Linear and non-linear ac response of the vortex matter in MgB₂ single crystals

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Keywords

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