Low-temperature penetration depth of k-(ET)2 Cu[N(CN)2]Br and k-(ET)2 Cu(NCS)2

A. Carrington; I. J. Bonalde; R. Prozorov; R. W. Giannetta; A. M. Kini; J. Schlueter; H. H. Wang; U. Geiser; J. M. Williams

doi:10.1103/PhysRevLett.83.4172

Low-temperature penetration depth of k-(ET)₂ Cu[N(CN)₂]Br and k-(ET)₂ Cu(NCS)₂

A. Carrington, I. J. Bonalde, R. Prozorov, R. W. Giannetta, A. M. Kini, J. Schlueter, H. H. Wang, U. Geiser, J. M. Williams

Physics

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

Abstract

We present high-precision measurements of the penetration depth of single crystals of k-(ET)₂ Cu[N(CN)₂]Br and k-(ET)₂ Cu(NCS)₂at temperatures down to 0.4 K. We find that, at low temperatures, the in-plane penetration depth (λ_||)varies as a fractional power law, λ_|| ∼T^3/2. While this may be taken as evidence for novel pair excitation processes, we show that the data are also consistent with a quasilinear variation of the superfluid density, as is expected for a d-wave superconductor with impurities or a small residual gap. Our data for the interplane penetration depth show similar features and give a direct measurement of the absolute value, λ⊥(0)=100 ±20 μm.

Original language	English (US)
Pages (from-to)	4172-4175
Number of pages	4
Journal	Physical review letters
Volume	83
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.83.4172
State	Published - Jan 1 1999

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Low-temperature penetration depth of k-(ET)2 Cu[N(CN)2]Br and k-(ET)2 Cu(NCS)2",

abstract = "We present high-precision measurements of the penetration depth of single crystals of k-(ET)2 Cu[N(CN)2]Br and k-(ET)2 Cu(NCS)2at temperatures down to 0.4 K. We find that, at low temperatures, the in-plane penetration depth (λ||)varies as a fractional power law, λ|| ∼T3/2. While this may be taken as evidence for novel pair excitation processes, we show that the data are also consistent with a quasilinear variation of the superfluid density, as is expected for a d-wave superconductor with impurities or a small residual gap. Our data for the interplane penetration depth show similar features and give a direct measurement of the absolute value, λ⊥(0)=100 ±20 μm.",

author = "A. Carrington and Bonalde, {I. J.} and R. Prozorov and Giannetta, {R. W.} and Kini, {A. M.} and J. Schlueter and Wang, {H. H.} and U. Geiser and Williams, {J. M.}",

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T1 - Low-temperature penetration depth of k-(ET)2 Cu[N(CN)2]Br and k-(ET)2 Cu(NCS)2

AU - Carrington, A.

AU - Bonalde, I. J.

AU - Prozorov, R.

AU - Giannetta, R. W.

AU - Kini, A. M.

AU - Schlueter, J.

AU - Wang, H. H.

AU - Geiser, U.

AU - Williams, J. M.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - We present high-precision measurements of the penetration depth of single crystals of k-(ET)2 Cu[N(CN)2]Br and k-(ET)2 Cu(NCS)2at temperatures down to 0.4 K. We find that, at low temperatures, the in-plane penetration depth (λ||)varies as a fractional power law, λ|| ∼T3/2. While this may be taken as evidence for novel pair excitation processes, we show that the data are also consistent with a quasilinear variation of the superfluid density, as is expected for a d-wave superconductor with impurities or a small residual gap. Our data for the interplane penetration depth show similar features and give a direct measurement of the absolute value, λ⊥(0)=100 ±20 μm.

AB - We present high-precision measurements of the penetration depth of single crystals of k-(ET)2 Cu[N(CN)2]Br and k-(ET)2 Cu(NCS)2at temperatures down to 0.4 K. We find that, at low temperatures, the in-plane penetration depth (λ||)varies as a fractional power law, λ|| ∼T3/2. While this may be taken as evidence for novel pair excitation processes, we show that the data are also consistent with a quasilinear variation of the superfluid density, as is expected for a d-wave superconductor with impurities or a small residual gap. Our data for the interplane penetration depth show similar features and give a direct measurement of the absolute value, λ⊥(0)=100 ±20 μm.

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