Magnetotransport and the upper critical magnetic field in MgB2

P. Szabó; P. Samuely; A. G.M. Jansen; T. Klein; J. Marcus; D. Fruchart; S. Miraglia

doi:10.1016/S0921-4534(01)01252-7

Magnetotransport and the upper critical magnetic field in MgB₂

P. Szabó
, P. Samuely
, A. G.M. Jansen
, T. Klein
, J. Marcus
, D. Fruchart
, S. Miraglia

Institute of Experimental Physics Slovak Academy of Sciences
Institut NÉEL
INSA

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

Magnetotransport measurements are presented on polycrystalline MgB₂ samples. The 'resistive' upper critical magnetic field reveals a temperature dependence with a positive curvature from T_c = 39.3 K down to about 20 K, then changes to a slightly negative curvature reaching 25 T at 1.5 K. The 25-T upper critical field is much higher than what is known so far on polycrystals of MgB₂ but it is in agreement with recent data obtained on epitaxial MgB₂ films. The deviation of B_c2(T) from standard BCS might be due to the proposed two-gap superconductivity in this compound. The observed quadratic normal-state magnetoresistance with validity of Kohler's rule can be ascribed to classical trajectory effects in the low-field limit.

langue originale	Anglais
Pages (de - à)	250-253
Nombre de pages	4
journal	Physica C: Superconductivity and its Applications
Volume	369
Numéro de publication	1-4
Les DOIs	https://doi.org/10.1016/S0921-4534(01)01252-7
état	Publié - 15 mars 2002
Modification externe	Oui

Accès au document

10.1016/S0921-4534(01)01252-7

Contient cette citation

@article{f826c34d69764bf6a056266783ba6e8d,

title = "Magnetotransport and the upper critical magnetic field in MgB2",

abstract = "Magnetotransport measurements are presented on polycrystalline MgB2 samples. The 'resistive' upper critical magnetic field reveals a temperature dependence with a positive curvature from Tc = 39.3 K down to about 20 K, then changes to a slightly negative curvature reaching 25 T at 1.5 K. The 25-T upper critical field is much higher than what is known so far on polycrystals of MgB2 but it is in agreement with recent data obtained on epitaxial MgB2 films. The deviation of Bc2(T) from standard BCS might be due to the proposed two-gap superconductivity in this compound. The observed quadratic normal-state magnetoresistance with validity of Kohler's rule can be ascribed to classical trajectory effects in the low-field limit.",

keywords = "Exotic superconductors, Magnetotransport, Upper critical magnetic field",

author = "P. Szab{\'o} and P. Samuely and Jansen, \{A. G.M.\} and T. Klein and J. Marcus and D. Fruchart and S. Miraglia",

year = "2002",

month = mar,

day = "15",

doi = "10.1016/S0921-4534(01)01252-7",

language = "English",

volume = "369",

pages = "250--253",

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

issn = "0921-4534",

number = "1-4",

}

TY - JOUR

T1 - Magnetotransport and the upper critical magnetic field in MgB2

AU - Szabó, P.

AU - Samuely, P.

AU - Jansen, A. G.M.

AU - Klein, T.

AU - Marcus, J.

AU - Fruchart, D.

AU - Miraglia, S.

PY - 2002/3/15

Y1 - 2002/3/15

N2 - Magnetotransport measurements are presented on polycrystalline MgB2 samples. The 'resistive' upper critical magnetic field reveals a temperature dependence with a positive curvature from Tc = 39.3 K down to about 20 K, then changes to a slightly negative curvature reaching 25 T at 1.5 K. The 25-T upper critical field is much higher than what is known so far on polycrystals of MgB2 but it is in agreement with recent data obtained on epitaxial MgB2 films. The deviation of Bc2(T) from standard BCS might be due to the proposed two-gap superconductivity in this compound. The observed quadratic normal-state magnetoresistance with validity of Kohler's rule can be ascribed to classical trajectory effects in the low-field limit.

AB - Magnetotransport measurements are presented on polycrystalline MgB2 samples. The 'resistive' upper critical magnetic field reveals a temperature dependence with a positive curvature from Tc = 39.3 K down to about 20 K, then changes to a slightly negative curvature reaching 25 T at 1.5 K. The 25-T upper critical field is much higher than what is known so far on polycrystals of MgB2 but it is in agreement with recent data obtained on epitaxial MgB2 films. The deviation of Bc2(T) from standard BCS might be due to the proposed two-gap superconductivity in this compound. The observed quadratic normal-state magnetoresistance with validity of Kohler's rule can be ascribed to classical trajectory effects in the low-field limit.

KW - Exotic superconductors

KW - Magnetotransport

KW - Upper critical magnetic field

U2 - 10.1016/S0921-4534(01)01252-7

DO - 10.1016/S0921-4534(01)01252-7

M3 - Article

AN - SCOPUS:0037086924

SN - 0921-4534

VL - 369

SP - 250

EP - 253

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1-4

ER -

Magnetotransport and the upper critical magnetic field in MgB2

Résumé

Accès au document

Empreinte digitale

Contient cette citation

Magnetotransport and the upper critical magnetic field in MgB₂