Correlation between superconducting carrier density and transition temperature in NbB 2+x

Hiroyuki Takagiwa; Sogo Kuroiwa; Maki Yamazawa; Jun Akimitsu; Kazuki Ohishi; Akihiro Koda; Wataru Higemoto; Ryosuke Kadono

doi:10.1143/JPSJ.74.1386

Correlation between superconducting carrier density and transition temperature in NbB _2+x

Hiroyuki Takagiwa, Sogo Kuroiwa, Maki Yamazawa, Jun Akimitsu, Kazuki Ohishi, Akihiro Koda, Wataru Higemoto, Ryosuke Kadono

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

7 Citations (Scopus)

Abstract

We report on the magnetic penetration depth, λ, in a type II superconductor NbB _2+x determined by muon spin rotation/relaxation measurements. We show in the sample with x = 0.1 that λ at 2.0 K is independent of an applied magnetic field. This suggests that the superconducting order parameter in NbB _2+x is isotropic, as expected for conventional BCS superconductors. Meanwhile, the superconducting carrier density (∝ λ ^-2) exhibits an interesting tendency of increase with increasing T _c (where T _c varies with x), which is described by the weak-coupling BCS theory.

Original language	English
Pages (from-to)	1386-1389
Number of pages	4
Journal	journal of the physical society of japan
Volume	74
Issue number	5
DOIs	https://doi.org/10.1143/JPSJ.74.1386
Publication status	Published - May 2005
Externally published	Yes

Keywords

Carrier density
Magnetic penetration depth
NbB
Superconductivity
μSR

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.74.1386

Cite this

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title = "Correlation between superconducting carrier density and transition temperature in NbB 2+x ",

abstract = "We report on the magnetic penetration depth, λ, in a type II superconductor NbB 2+x determined by muon spin rotation/relaxation measurements. We show in the sample with x = 0.1 that λ at 2.0 K is independent of an applied magnetic field. This suggests that the superconducting order parameter in NbB 2+x is isotropic, as expected for conventional BCS superconductors. Meanwhile, the superconducting carrier density (∝ λ -2) exhibits an interesting tendency of increase with increasing T c (where T c varies with x), which is described by the weak-coupling BCS theory.",

keywords = "Carrier density, Magnetic penetration depth, NbB, Superconductivity, μSR",

author = "Hiroyuki Takagiwa and Sogo Kuroiwa and Maki Yamazawa and Jun Akimitsu and Kazuki Ohishi and Akihiro Koda and Wataru Higemoto and Ryosuke Kadono",

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T1 - Correlation between superconducting carrier density and transition temperature in NbB 2+x

AU - Takagiwa, Hiroyuki

AU - Kuroiwa, Sogo

AU - Yamazawa, Maki

AU - Akimitsu, Jun

AU - Ohishi, Kazuki

AU - Koda, Akihiro

AU - Higemoto, Wataru

AU - Kadono, Ryosuke

PY - 2005/5

Y1 - 2005/5

N2 - We report on the magnetic penetration depth, λ, in a type II superconductor NbB 2+x determined by muon spin rotation/relaxation measurements. We show in the sample with x = 0.1 that λ at 2.0 K is independent of an applied magnetic field. This suggests that the superconducting order parameter in NbB 2+x is isotropic, as expected for conventional BCS superconductors. Meanwhile, the superconducting carrier density (∝ λ -2) exhibits an interesting tendency of increase with increasing T c (where T c varies with x), which is described by the weak-coupling BCS theory.

AB - We report on the magnetic penetration depth, λ, in a type II superconductor NbB 2+x determined by muon spin rotation/relaxation measurements. We show in the sample with x = 0.1 that λ at 2.0 K is independent of an applied magnetic field. This suggests that the superconducting order parameter in NbB 2+x is isotropic, as expected for conventional BCS superconductors. Meanwhile, the superconducting carrier density (∝ λ -2) exhibits an interesting tendency of increase with increasing T c (where T c varies with x), which is described by the weak-coupling BCS theory.

KW - Carrier density

KW - Magnetic penetration depth

KW - NbB

KW - Superconductivity

KW - μSR

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