Two-band effects in the angular dependence of Hc2 of MgB 2 single crystals

A. Rydh; U. Welp; A. E. Koshelev; W. K. Kwok; G. W. Crabtree; R. Brusetti; L. Lyard; T. Klein; C. Marcenat; B. Kang; K. H. Kim; K. H.P. Kim; H. S. Lee; S. I. Lee

doi:10.1103/PhysRevB.70.132503

Two-band effects in the angular dependence of H_c2 of MgB ₂ single crystals

A. Rydh
, U. Welp
, A. E. Koshelev
, W. K. Kwok
, G. W. Crabtree
, R. Brusetti
, L. Lyard
, T. Klein
, C. Marcenat
, B. Kang
, K. H. Kim
, K. H.P. Kim
, H. S. Lee
, S. I. Lee

École Polytechnique

Argonne National Laboratory
Centre national de la recherche scientifique
Univ. Joseph Fourier-Grenoble 1
Pohang University of Science and Technology

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

Abstract

The angular dependence of the upper critical field H_c2 of MgB₂ single crystals is studied at various temperatures by means of specific-heat and transport measurements in magnetic fields up to 17 T. Clear deviations from Ginzburg-Landau behavior are observed at all temperatures and are explained by two-band effects. The angular dependence and temperature dependence of the deviations are in qualitative agreement with theoretical predictions based on band-structure calculations. Quantitative agreement is obtained with an interband coupling slightly stronger than the calculated one, enabling band-structure anisotropies and interband coupling strength to be experimentally estimated. This provides a pathway to the study of disorder and doping effects in MgB₂.

Original language	English
Article number	132503
Pages (from-to)	132503-1-132503-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.70.132503
Publication status	Published - 1 Oct 2004

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10.1103/PhysRevB.70.132503

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Rydh, A., Welp, U., Koshelev, A. E., Kwok, W. K., Crabtree, G. W., Brusetti, R., Lyard, L., Klein, T., Marcenat, C., Kang, B., Kim, K. H., Kim, K. H. P., Lee, H. S., & Lee, S. I. (2004). Two-band effects in the angular dependence of H_c2 of MgB ₂ single crystals. Physical Review B - Condensed Matter and Materials Physics, 70(13), 132503-1-132503-4. Article 132503. https://doi.org/10.1103/PhysRevB.70.132503

@article{843fb7e396b74f6e99424a43138a5b7a,

title = "Two-band effects in the angular dependence of Hc2 of MgB 2 single crystals",

abstract = "The angular dependence of the upper critical field Hc2 of MgB2 single crystals is studied at various temperatures by means of specific-heat and transport measurements in magnetic fields up to 17 T. Clear deviations from Ginzburg-Landau behavior are observed at all temperatures and are explained by two-band effects. The angular dependence and temperature dependence of the deviations are in qualitative agreement with theoretical predictions based on band-structure calculations. Quantitative agreement is obtained with an interband coupling slightly stronger than the calculated one, enabling band-structure anisotropies and interband coupling strength to be experimentally estimated. This provides a pathway to the study of disorder and doping effects in MgB2.",

author = "A. Rydh and U. Welp and Koshelev, \{A. E.\} and Kwok, \{W. K.\} and Crabtree, \{G. W.\} and R. Brusetti and L. Lyard and T. Klein and C. Marcenat and B. Kang and Kim, \{K. H.\} and Kim, \{K. H.P.\} and Lee, \{H. S.\} and Lee, \{S. I.\}",

year = "2004",

month = oct,

day = "1",

doi = "10.1103/PhysRevB.70.132503",

language = "English",

volume = "70",

pages = "132503--1--132503--4",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

number = "13",

}

Rydh, A, Welp, U, Koshelev, AE, Kwok, WK, Crabtree, GW, Brusetti, R, Lyard, L, Klein, T, Marcenat, C, Kang, B, Kim, KH, Kim, KHP, Lee, HS & Lee, SI 2004, 'Two-band effects in the angular dependence of H_c2 of MgB ₂ single crystals', Physical Review B - Condensed Matter and Materials Physics, vol. 70, no. 13, 132503, pp. 132503-1-132503-4. https://doi.org/10.1103/PhysRevB.70.132503

TY - JOUR

T1 - Two-band effects in the angular dependence of Hc2 of MgB 2 single crystals

AU - Rydh, A.

AU - Welp, U.

AU - Koshelev, A. E.

AU - Kwok, W. K.

AU - Crabtree, G. W.

AU - Brusetti, R.

AU - Lyard, L.

AU - Klein, T.

AU - Marcenat, C.

AU - Kang, B.

AU - Kim, K. H.

AU - Kim, K. H.P.

AU - Lee, H. S.

AU - Lee, S. I.

PY - 2004/10/1

Y1 - 2004/10/1

N2 - The angular dependence of the upper critical field Hc2 of MgB2 single crystals is studied at various temperatures by means of specific-heat and transport measurements in magnetic fields up to 17 T. Clear deviations from Ginzburg-Landau behavior are observed at all temperatures and are explained by two-band effects. The angular dependence and temperature dependence of the deviations are in qualitative agreement with theoretical predictions based on band-structure calculations. Quantitative agreement is obtained with an interband coupling slightly stronger than the calculated one, enabling band-structure anisotropies and interband coupling strength to be experimentally estimated. This provides a pathway to the study of disorder and doping effects in MgB2.

AB - The angular dependence of the upper critical field Hc2 of MgB2 single crystals is studied at various temperatures by means of specific-heat and transport measurements in magnetic fields up to 17 T. Clear deviations from Ginzburg-Landau behavior are observed at all temperatures and are explained by two-band effects. The angular dependence and temperature dependence of the deviations are in qualitative agreement with theoretical predictions based on band-structure calculations. Quantitative agreement is obtained with an interband coupling slightly stronger than the calculated one, enabling band-structure anisotropies and interband coupling strength to be experimentally estimated. This provides a pathway to the study of disorder and doping effects in MgB2.

U2 - 10.1103/PhysRevB.70.132503

DO - 10.1103/PhysRevB.70.132503

M3 - Article

AN - SCOPUS:42749107506

SN - 1098-0121

VL - 70

SP - 132503-1-132503-4

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 13

M1 - 132503

ER -

Two-band effects in the angular dependence of Hc2 of MgB 2 single crystals

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Two-band effects in the angular dependence of H_c2 of MgB ₂ single crystals