Collapse of the vortex-lattice inductance and shear modulus at the melting transition in untwinned YBa2Cu3O7

Peter Matl, N. P. Ong, R. Gagnon, L. Taillefer

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The complex resistivity ρ(ω) of the vortex lattice in an untwinned crystal of 93-K YBa2Cu3O7 has been measured at frequencies ω/2π from 100 kHz to 20 MHz in a 2-T field H∥c, using a four-probe rf transmission technique that enables continuous measurements versus ω and temperature T. As T is increased, the inductance Ls(ω) = Imρ(ω)/ω increases steeply to a cusp at the melting temperature Tm, and then undergoes a steep collapse consistent with vanishing of the shear modulus c66. We discuss in detail the separation of the vortex-lattice inductance from the "volume" inductance, and other skin-depth effects. To analyze the spectra, we consider a weakly disordered lattice with a low pin density. Close fits are obtained to ρl(ω) over 2 decades in ω. Values of the pinning parameter κ and shear modulus c66 obtained show that c66 collapses by over 4 decades at Tm, whereas κ remains finite.

Original languageEnglish (US)
Article number214514
Pages (from-to)2145141-21451411
Number of pages19306271
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number21
DOIs
StatePublished - Jun 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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