Vortex penetration depth of κ-(ET) 2Cu[N(CN)2]Br

N. H. Tea, F. A.B. Chaves, U. Klostermann, R. Giannetta, M. B. Salamon, J. M. Williams, H. H. Wang, U. Geiser

Research output: Contribution to journalArticlepeer-review

Abstract

The magnetic field dependence of the in-plane penetration depth λ(H) for single crystal κ-(ET)2Cu[N(CN)2]Br has been measured at 3, 9.6, and 36 MHz. Over a limited range, λ scales with a characteristic field H * (T) that coincides with a shoulder in the λ vs. H curves. Above that field, λ increases sharply toward a second inflection point at H * * (T), which is close to the irreversibility line measured by magnetization. For fields larger than H * * the penetration depth diverges, suggesting that the vortex lattice has melted. The field dependence at one frequency agrees qualitatively with a model of pinned vortices at low fields giving way to flux flow at higher fields. However, the observed frequency dependence deviates significantly from the predictions of this model, suggesting that collective effects play a major role. Our technique also yields a new measurement for the interplane penetration depth λ ⊥ ~ 300 μm, implying an anisotropy ⊥ ⊥/λ > 200.

Original languageEnglish (US)
Pages (from-to)281-288
Number of pages8
JournalPhysica C: Superconductivity and its applications
Volume280
Issue number4
DOIs
StatePublished - Jul 15 1997

Keywords

  • Anisotropy
  • Flux lattice melting
  • Flux pinning
  • Penetration depth
  • Scaling

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Vortex penetration depth of κ-(ET) <sub>2</sub>Cu[N(CN)<sub>2</sub>]Br'. Together they form a unique fingerprint.

Cite this