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 journalArticle

27 Citations (Scopus)

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

Fingerprint

Vortex flow
Microwaves
vortices
Ions
microwaves
Thin films
Defects
Microwave frequencies
defects
accommodation
thin films
microwave frequencies
ions
barium copper yttrium oxide
energy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Lofland, S., Bhagat, S. M., Rajeswari, M., Venkatesan, T., Kanjilal, D., Senapati, L., & Mehta, G. K. (1995). Microwave observation of the vortex locked-in state in YBa2Cu3O7 thin films with columnar defects. Physical Review B, 51(13), 8489-8493. https://doi.org/10.1103/PhysRevB.51.8489
Lofland, Samuel ; Bhagat, S. M. ; Rajeswari, M. ; Venkatesan, T. ; Kanjilal, D. ; Senapati, L. ; Mehta, G. K. / Microwave observation of the vortex locked-in state in YBa2Cu3O7 thin films with columnar defects. In: Physical Review B. 1995 ; Vol. 51, No. 13. pp. 8489-8493.
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Lofland, S, Bhagat, SM, Rajeswari, M, Venkatesan, T, Kanjilal, D, Senapati, L & Mehta, GK 1995, 'Microwave observation of the vortex locked-in state in YBa2Cu3O7 thin films with columnar defects', Physical Review B, vol. 51, no. 13, pp. 8489-8493. https://doi.org/10.1103/PhysRevB.51.8489

Microwave observation of the vortex locked-in state in YBa2Cu3O7 thin films with columnar defects. / Lofland, Samuel; Bhagat, S. M.; Rajeswari, M.; Venkatesan, T.; Kanjilal, D.; Senapati, L.; Mehta, G. K.

In: Physical Review B, Vol. 51, No. 13, 01.01.1995, p. 8489-8493.

Research output: Contribution to journalArticle

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AU - Lofland, Samuel

AU - Bhagat, S. M.

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AB - 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.

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