Anisotropic superconductivity in NbSe2 probed by magnetic penetration depth

P. Diener; P. Rodière; J. D. Fletcher; A. Carrington; J. P. Brison; R. Prozorov; T. Olheiser; R. W. Giannetta

doi:10.1016/j.physc.2007.03.145

Anisotropic superconductivity in NbSe₂ probed by magnetic penetration depth

P. Diener
, P. Rodière
, J. D. Fletcher
, A. Carrington
, J. P. Brison
, R. Prozorov
, T. Olheiser
, R. W. Giannetta

Physics

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

Abstract

NbSe₂ shows coexistence of a charge density wave (T_CDW ∼ 32 K) with a superconducting state below T = 7.2 K. Recent ARPES measurements revealed different values of the superconducting gap on the main sheets of the Fermi surface. These results suggest a multigap superconductivity such as in MgB₂. The temperature dependence of the magnetic penetration depth (λ(T)) down to T_c/16 has been measured on high quality single crystals in the Meissner state. A strong increase of the in-plane penetration depth is observed, signaling the presence of low lying excitations. Given the relative contributions of each Fermi surface sheet, these measurements indicate that a reduced gap is not necessarily only found on the small Se sheet as suggested by the ARPES measurements. These results are discussed in a framework of multigap superconductivity.

Original language	English (US)
Pages (from-to)	700-701
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	460-462 I
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2007.03.145
State	Published - Sep 1 2007

Keywords

NbSe
Penetration depth
Superfluid density

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Online availability

10.1016/j.physc.2007.03.145

Library availability

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Cite this

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title = "Anisotropic superconductivity in NbSe2 probed by magnetic penetration depth",

abstract = "NbSe2 shows coexistence of a charge density wave (TCDW ∼ 32 K) with a superconducting state below T = 7.2 K. Recent ARPES measurements revealed different values of the superconducting gap on the main sheets of the Fermi surface. These results suggest a multigap superconductivity such as in MgB2. The temperature dependence of the magnetic penetration depth (λ(T)) down to Tc/16 has been measured on high quality single crystals in the Meissner state. A strong increase of the in-plane penetration depth is observed, signaling the presence of low lying excitations. Given the relative contributions of each Fermi surface sheet, these measurements indicate that a reduced gap is not necessarily only found on the small Se sheet as suggested by the ARPES measurements. These results are discussed in a framework of multigap superconductivity.",

keywords = "NbSe, Penetration depth, Superfluid density",

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T1 - Anisotropic superconductivity in NbSe2 probed by magnetic penetration depth

AU - Diener, P.

AU - Rodière, P.

AU - Fletcher, J. D.

AU - Carrington, A.

AU - Brison, J. P.

AU - Prozorov, R.

AU - Olheiser, T.

AU - Giannetta, R. W.

PY - 2007/9/1

Y1 - 2007/9/1

N2 - NbSe2 shows coexistence of a charge density wave (TCDW ∼ 32 K) with a superconducting state below T = 7.2 K. Recent ARPES measurements revealed different values of the superconducting gap on the main sheets of the Fermi surface. These results suggest a multigap superconductivity such as in MgB2. The temperature dependence of the magnetic penetration depth (λ(T)) down to Tc/16 has been measured on high quality single crystals in the Meissner state. A strong increase of the in-plane penetration depth is observed, signaling the presence of low lying excitations. Given the relative contributions of each Fermi surface sheet, these measurements indicate that a reduced gap is not necessarily only found on the small Se sheet as suggested by the ARPES measurements. These results are discussed in a framework of multigap superconductivity.

AB - NbSe2 shows coexistence of a charge density wave (TCDW ∼ 32 K) with a superconducting state below T = 7.2 K. Recent ARPES measurements revealed different values of the superconducting gap on the main sheets of the Fermi surface. These results suggest a multigap superconductivity such as in MgB2. The temperature dependence of the magnetic penetration depth (λ(T)) down to Tc/16 has been measured on high quality single crystals in the Meissner state. A strong increase of the in-plane penetration depth is observed, signaling the presence of low lying excitations. Given the relative contributions of each Fermi surface sheet, these measurements indicate that a reduced gap is not necessarily only found on the small Se sheet as suggested by the ARPES measurements. These results are discussed in a framework of multigap superconductivity.

KW - NbSe

KW - Penetration depth

KW - Superfluid density

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