Melting and Dimensionality of the Vortex Lattice in Underdoped
  YBa2Cu3O6.60

A. Schilling; A. Schilling; B. Billon; B. Keimer; C. Bernhard; C. Bernhard; C. E. Stronach; C.M. Aegerter; C.M. Aegerter; D. A. Bonn; D. R. Noakes; D.A. Bonn; D.A. Bonn; D.G. Fleming; D.R. Harshman; D.R. Harshman; D.S. Fisher; E. Rodriguez; E.H. Brandt; G. Blatter; H. Safar; I. Maggio-Aprile; J. Chakhalian; J. E. Sonier; J. H. Brewer; J.A. Fendrich; J.A. Fendrich; J.E. Sonier; J.E. Sonier; J.H. Brewer; J.W. Schneider; M. Ichioka; M.C. Marchetti; N.E. Hussey; R. F. Kiefl; R. I. Miller; R. Liang; R. Liang; R.G. Beck; S. R. Dunsiger; S.L. Lee; S.L. Lee; S.L. Lee; S.T. Johnson; T. Blasius; T. M. Riseman; T.M. Riseman; U. Welp; W. A. MacFarlane; W. N. Hardy; W.K. Kwok

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Melting and Dimensionality of the Vortex Lattice in Underdoped YBa2Cu3O6.60

Abstract

Muon spin rotation measurements of the magnetic field distribution in the vortex state of the oxygen deficient high-Tc superconductor YBa{2}Cu{3}O{6.60} reveal a vortex-lattice melting transition at much lower temperature than that in the fully oxygenated material. The transition is best described by a model in which adjacent layers of ``pancake'' vortices decouple in the liquid phase. Evidence is also found for a pinning-induced crossover from a solid 3D to quasi-2D vortex lattice, similar to that observed in the highly anisotropic superconductor Bi{2+x}Sr{2-x}CaCu{2}O{8+y}.Comment: 8 pages, 4 figures, 5 postscript file

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