UNIGE document Scientific Article
previous document  unige:23841  next document
add to browser collection
Title

Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the β-Pyrochlore KOs2O6
Authors
Dubois, Cédric
Santi, Gilles
Cuttat, Ignace
Berthod, Christophe
Jenkins, Nathan
Petrovic, Alexander
Manuel, Alfred-Adrien
Fischer, Oystein
show hidden authors show all authors [1 - 11]
Published in Physical Review Letters. 2008, vol. 101, no. 5, p. 057004
Abstract We performed the first scanning tunneling spectroscopy measurements on the pyrochlore superconductor KOs2O6 (Tc=9.6  K) in both zero magnetic field and the vortex state at several temperatures above 1.95 K. This material presents atomically flat surfaces, yielding spatially homogeneous spectra which reveal fully gapped superconductivity with a gap anisotropy of 30%. Measurements performed at fields of 2 and 6 T display a hexagonal Abrikosov flux line lattice. From the shape of the vortex cores, we extract a coherence length of 31–40 Å, in agreement with the value derived from the upper critical field Hc2. We observe a reduction in size of the vortex cores (and hence the coherence length) with increasing field which is consistent with the unexpectedly high and unsaturated upper critical field reported.
Identifiers
Full text
Article (Published version) (1.8 MB) - public document Free access
Other version: http://link.aps.org/doi/10.1103/PhysRevLett.101.057004
Structures
Faculté des sciences / Section de physique / Département de physique de la matière quantique
Citation
(ISO format) 		DUBOIS, Cédric et al. Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the β-Pyrochlore KOs2O6. In: Physical Review Letters, 2008, vol. 101, n° 5, p. 057004. https://archive-ouverte.unige.ch/unige:23841

174 hits

97 downloads

Contact an author

Update request

Update

Deposited on : 2012-11-07

Export document
Format :
Citation style :