SR study of carbon-doped superconductors

K. Papagelis; J. Arvanitidis; K. Prassides; A. Schenck; T. Takenobu; Y. Iwasa

doi:10.1209/epl/i2003-00102-1

All issues

Volume 61 / No 2 (January 2003)

Europhys. Lett., 61 2 (2003) 254-260

Abstract

Issue		Europhys. Lett. Volume 61, Number 2, January 2003


Page(s)		254 - 260
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-00102-1
Published online		01 January 2003

Europhys. Lett., 61 (2), pp. 254-260 (2003)

${\mu^+}$ SR study of carbon-doped $\chem{MgB_2}$ superconductors

K. Papagelis¹, J. Arvanitidis¹, K. Prassides¹, A. Schenck², T. Takenobu³ and Y. Iwasa³

¹ School of Chemistry, Physics and Environmental Science, University of Sussex Brighton BN1 9QJ, UK
² Institute for Particle Physics, ETH Zurich - CH-5232 Villigen PSI, Switzerland
³ Institute for Materials Research, Tohoku University - Sendai 980-8577, Japan and CREST, Japan Science and Technology Corporation - Kawaguchi 332-0012, Japan

Received: 24 July 2002
Accepted: 7 November 2002

Abstract

The evolution of the superconducting properties of the carbon-doped $\chem{MgB_2}$ superconductors, $\chem{MgB}$ $_{2-x}$ $\chem{C}$ _x ( $x= 0.02$ , 0.04, 0.06) have been investigated by the transverse-field muon spin rotation (TF- $\mu^+$ SR) technique. The low-temperature depolarisation rate, $\sigma(0)$ at 0.6 $\un{T}$ which is proportional to the second moment of the field distribution of the vortex lattice decreases monotonically with increasing electron doping and decreasing $T_\ab{c}$ . In addition, the temperature dependence of $\sigma(T)$ has been analysed in terms of a two-gap model. The size of the two superconducting gaps decreases linearly as the carbon content increases.

PACS: 76.75.+i – Muon spin rotation and relaxation / 74.70.Ad – Metals, alloys and binary compounds (including A15, Laves phases, etc.) / 74.20.-z – Theories and models of superconducting state

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