Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the β-Pyrochlore KOs<sub>2</sub>O<sub>6</sub>

Dubois, Cédric; Santi, Gilles; Cuttat, Ignace; Berthod, Christophe; Jenkins, Nathan; Petrovic, Alexander; Manuel, Alfred-Adrien; Fischer, Oystein; Kazakov, S.; Bukowski, Z.; Karpinski, J.

doi:10.1103/PhysRevLett.101.057004

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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 Kazakov, S. Bukowski, Z. Karpinski, J. 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		DOI: 10.1103/PhysRevLett.101.057004
Full text		Article (Published version) (1.8 MB) - Free access
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. doi: 10.1103/PhysRevLett.101.057004 https://archive-ouverte.unige.ch/unige:23841