Andreev-reflection study in MgB2

P. Szabó; P. Samuely; J. Kačmarčik; A. G.M. Jansen; T. Klein; J. Marcus; C. Marcenat

doi:10.1088/0953-2048/16/2/306

Andreev-reflection study in MgB₂

P. Szabó
, P. Samuely
, J. Kačmarčik
, A. G.M. Jansen
, T. Klein
, J. Marcus
, C. Marcenat

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

Abstract

Point-contact measurements have been performed on polycrystalline MgB₂ samples using a Cu counter electrode. The current-voltage (I-V) characteristics reveal Andreev-reflection structures from the ballistic transport across the normal-metal/superconductor interface. The spectra contain two different energy gaps which close near the same bulk critical temperature. These results support the multiband model of superconductivity for MgB₂ proposed by Liu et al. Point-contact experiments in a magnetic field show that the small-gap structure disappears in fields of 1-2 T whereas the large-gap structure is suppressed in larger fields going up to around 15 T. Nonlinearities in the current-voltage characteristics contain information on the energy dependence of the electron-phonon interaction.

Original language	English
Pages (from-to)	162-166
Number of pages	5
Journal	Superconductor Science and Technology
Volume	16
Issue number	2
DOIs	https://doi.org/10.1088/0953-2048/16/2/306
Publication status	Published - 1 Feb 2003
Externally published	Yes

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title = "Andreev-reflection study in MgB2",

abstract = "Point-contact measurements have been performed on polycrystalline MgB2 samples using a Cu counter electrode. The current-voltage (I-V) characteristics reveal Andreev-reflection structures from the ballistic transport across the normal-metal/superconductor interface. The spectra contain two different energy gaps which close near the same bulk critical temperature. These results support the multiband model of superconductivity for MgB2 proposed by Liu et al. Point-contact experiments in a magnetic field show that the small-gap structure disappears in fields of 1-2 T whereas the large-gap structure is suppressed in larger fields going up to around 15 T. Nonlinearities in the current-voltage characteristics contain information on the energy dependence of the electron-phonon interaction.",

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

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T1 - Andreev-reflection study in MgB2

AU - Szabó, P.

AU - Samuely, P.

AU - Kačmarčik, J.

AU - Jansen, A. G.M.

AU - Klein, T.

AU - Marcus, J.

AU - Marcenat, C.

PY - 2003/2/1

Y1 - 2003/2/1

N2 - Point-contact measurements have been performed on polycrystalline MgB2 samples using a Cu counter electrode. The current-voltage (I-V) characteristics reveal Andreev-reflection structures from the ballistic transport across the normal-metal/superconductor interface. The spectra contain two different energy gaps which close near the same bulk critical temperature. These results support the multiband model of superconductivity for MgB2 proposed by Liu et al. Point-contact experiments in a magnetic field show that the small-gap structure disappears in fields of 1-2 T whereas the large-gap structure is suppressed in larger fields going up to around 15 T. Nonlinearities in the current-voltage characteristics contain information on the energy dependence of the electron-phonon interaction.

AB - Point-contact measurements have been performed on polycrystalline MgB2 samples using a Cu counter electrode. The current-voltage (I-V) characteristics reveal Andreev-reflection structures from the ballistic transport across the normal-metal/superconductor interface. The spectra contain two different energy gaps which close near the same bulk critical temperature. These results support the multiband model of superconductivity for MgB2 proposed by Liu et al. Point-contact experiments in a magnetic field show that the small-gap structure disappears in fields of 1-2 T whereas the large-gap structure is suppressed in larger fields going up to around 15 T. Nonlinearities in the current-voltage characteristics contain information on the energy dependence of the electron-phonon interaction.

U2 - 10.1088/0953-2048/16/2/306

DO - 10.1088/0953-2048/16/2/306

M3 - Article

AN - SCOPUS:0037321767

SN - 0953-2048

VL - 16

SP - 162

EP - 166

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 2

ER -

Andreev-reflection study in MgB2

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Andreev-reflection study in MgB₂