Andreev reflection spectroscopy in MgB2

P. Szabó; P. Samuely; J. Kačmarčík; T. Klein; J. Marcus; A. G.M. Jansen

doi:10.1016/S0921-4526(02)01798-2

Andreev reflection spectroscopy in MgB₂

P. Szabó
, P. Samuely
, J. Kačmarčík
, T. Klein
, J. Marcus
, A. G.M. Jansen

Institute of Experimental Physics Slovak Academy of Sciences
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
Institut NÉEL
Centre national de la recherche scientifique

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

Abstract

Our Andreev reflection measurements (Phys. Rev. Lett. 87 (2001) 137005) along with other experiments have led to a general consensus that MgB₂ is a multiband superconductor with two main superconducting gaps closing at the same T_c. Here we show the behavior of the small gap as a function of the temperature and magnetic field. This gap is isotropic with T_c of the bulk material but with a specific small (crossover) critical magnetic field of about 1 T much lower than the real H_c2. The latter field is anisotropic and is rather governed by the large gap and strongly anisotropic Fermi surface of the material.

Original language	English
Pages (from-to)	10-14
Number of pages	5
Journal	Physica B: Physics of Condensed Matter
Volume	328
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-4526(02)01798-2
Publication status	Published - 1 Jan 2003
Externally published	Yes
Event	T2PAM - Higashi-Hiroshima, Japan Duration: 16 Aug 2002 → 19 Aug 2002

Keywords

Andreev reflection spectroscopy
MgB

Access to Document

10.1016/S0921-4526(02)01798-2

Cite this

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title = "Andreev reflection spectroscopy in MgB2 ",

abstract = "Our Andreev reflection measurements (Phys. Rev. Lett. 87 (2001) 137005) along with other experiments have led to a general consensus that MgB2 is a multiband superconductor with two main superconducting gaps closing at the same Tc. Here we show the behavior of the small gap as a function of the temperature and magnetic field. This gap is isotropic with Tc of the bulk material but with a specific small (crossover) critical magnetic field of about 1 T much lower than the real Hc2. The latter field is anisotropic and is rather governed by the large gap and strongly anisotropic Fermi surface of the material.",

keywords = "Andreev reflection spectroscopy, MgB",

author = "P. Szab{\'o} and P. Samuely and J. Ka{\v c}mar{\v c}{\'i}k and T. Klein and J. Marcus and Jansen, \{A. G.M.\}",

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doi = "10.1016/S0921-4526(02)01798-2",

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TY - JOUR

T1 - Andreev reflection spectroscopy in MgB2

AU - Szabó, P.

AU - Samuely, P.

AU - Kačmarčík, J.

AU - Klein, T.

AU - Marcus, J.

AU - Jansen, A. G.M.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - Our Andreev reflection measurements (Phys. Rev. Lett. 87 (2001) 137005) along with other experiments have led to a general consensus that MgB2 is a multiband superconductor with two main superconducting gaps closing at the same Tc. Here we show the behavior of the small gap as a function of the temperature and magnetic field. This gap is isotropic with Tc of the bulk material but with a specific small (crossover) critical magnetic field of about 1 T much lower than the real Hc2. The latter field is anisotropic and is rather governed by the large gap and strongly anisotropic Fermi surface of the material.

AB - Our Andreev reflection measurements (Phys. Rev. Lett. 87 (2001) 137005) along with other experiments have led to a general consensus that MgB2 is a multiband superconductor with two main superconducting gaps closing at the same Tc. Here we show the behavior of the small gap as a function of the temperature and magnetic field. This gap is isotropic with Tc of the bulk material but with a specific small (crossover) critical magnetic field of about 1 T much lower than the real Hc2. The latter field is anisotropic and is rather governed by the large gap and strongly anisotropic Fermi surface of the material.

KW - Andreev reflection spectroscopy

KW - MgB

U2 - 10.1016/S0921-4526(02)01798-2

DO - 10.1016/S0921-4526(02)01798-2

M3 - Conference article

AN - SCOPUS:0037399966

SN - 0921-4526

VL - 328

SP - 10

EP - 14

JO - Physica B: Physics of Condensed Matter

JF - Physica B: Physics of Condensed Matter

IS - 1-2

T2 - T2PAM

Y2 - 16 August 2002 through 19 August 2002