Microwave observation of the vortex locked-in state in YBa2Cu3O7 thin films with columnar defects

Samuel Lofland, S. M. Bhagat, M. Rajeswari, T. Venkatesan, D. Kanjilal, L. Senapati, G. K. Mehta

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

We report the angular dependence of microwave magnetoabsorption of both pristine and 270-MeV-Ag-ion-irradiated YBa2Cu3O7-δ (YBCO) c-axis-oriented films. At these ion energies, columnar defects are introduced into YBCO, and Nelson and Vinokur [Phys. Rev. B. 68, 2398 (1992)] have predicted a state in which vortices are locked to such columnar defects. This has been confirmed by Budhani et al. [Phys. Rev. Lett. 72, 566 (1994)] using dc measurements. Such dc measurements effectively measure the depth of the pinning potential. We show evidence of a similar effect in the microwave-frequency regime. Here the bottom rather than the edge of the pinning potential is being probed. A simple analysis suggests a distribution of accommodation angles.

Original languageEnglish (US)
Pages (from-to)8489-8493
Number of pages5
JournalPhysical Review B
Volume51
Issue number13
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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