Geometrical barriers and lower critical field in MgB2 single crystals

L. Lyard; T. Klein; J. Marcus; R. Brusetti; C. Marcenat; M. Konczykowski; V. Mosser; K. H. Kim; B. W. Kang; H. S. Lee; S. I. Lee

doi:10.1103/PhysRevB.70.180504

Geometrical barriers and lower critical field in MgB₂ single crystals

L. Lyard
, T. Klein
, J. Marcus
, R. Brusetti
, C. Marcenat
, M. Konczykowski
, V. Mosser
, K. H. Kim
, B. W. Kang
, H. S. Lee
, S. I. Lee

Institut NÉEL
Institut Universitaire de France
Centre national de la recherche scientifique
Univ. Joseph Fourier-Grenoble 1
Laboratoire des Solides Irradiés
Schlumberger Utilities Technol. Grp.
Pohang University of Science and Technology

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

Abstract

The first penetration field (H_p) has been deduced from local magnetization and specific heat measurements in magnesium diboride single crystals. For H_a^∥c the geometrical barriers (GB) play a dominant role in the irreversibility mechanism. In thin samples, neglecting the GB in this direction would then lead to a large overestimation of H _c1 deduced from H_p through the standard elliptical formula. The lower critical field is found to be isotropic at low temperature (∼0.11±0.01 T).

Original language	English
Article number	180504
Pages (from-to)	1-4
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.70.180504
Publication status	Published - 1 Nov 2004
Externally published	Yes

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title = "Geometrical barriers and lower critical field in MgB2 single crystals",

abstract = "The first penetration field (Hp) has been deduced from local magnetization and specific heat measurements in magnesium diboride single crystals. For Ha∥c the geometrical barriers (GB) play a dominant role in the irreversibility mechanism. In thin samples, neglecting the GB in this direction would then lead to a large overestimation of H c1 deduced from Hp through the standard elliptical formula. The lower critical field is found to be isotropic at low temperature (∼0.11±0.01 T).",

author = "L. Lyard and T. Klein and J. Marcus and R. Brusetti and C. Marcenat and M. Konczykowski and V. Mosser and Kim, \{K. H.\} and Kang, \{B. W.\} and Lee, \{H. S.\} and Lee, \{S. I.\}",

year = "2004",

month = nov,

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doi = "10.1103/PhysRevB.70.180504",

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T1 - Geometrical barriers and lower critical field in MgB2 single crystals

AU - Lyard, L.

AU - Klein, T.

AU - Marcus, J.

AU - Brusetti, R.

AU - Marcenat, C.

AU - Konczykowski, M.

AU - Mosser, V.

AU - Kim, K. H.

AU - Kang, B. W.

AU - Lee, H. S.

AU - Lee, S. I.

PY - 2004/11/1

Y1 - 2004/11/1

N2 - The first penetration field (Hp) has been deduced from local magnetization and specific heat measurements in magnesium diboride single crystals. For Ha∥c the geometrical barriers (GB) play a dominant role in the irreversibility mechanism. In thin samples, neglecting the GB in this direction would then lead to a large overestimation of H c1 deduced from Hp through the standard elliptical formula. The lower critical field is found to be isotropic at low temperature (∼0.11±0.01 T).

AB - The first penetration field (Hp) has been deduced from local magnetization and specific heat measurements in magnesium diboride single crystals. For Ha∥c the geometrical barriers (GB) play a dominant role in the irreversibility mechanism. In thin samples, neglecting the GB in this direction would then lead to a large overestimation of H c1 deduced from Hp through the standard elliptical formula. The lower critical field is found to be isotropic at low temperature (∼0.11±0.01 T).

UR - https://www.scopus.com/pages/publications/19944426965

U2 - 10.1103/PhysRevB.70.180504

DO - 10.1103/PhysRevB.70.180504

M3 - Article

AN - SCOPUS:19944426965

SN - 1098-0121

VL - 70

SP - 1

EP - 4

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 18

M1 - 180504

ER -

Geometrical barriers and lower critical field in MgB₂ single crystals

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