μsR studies of layered organic superconductors: Vortex phases, penetration depth and anomalous superfluid properties

F. L. Pratt, S. J. Blundell, T. Lancaster, M. L. Brooks, S. L. Lee, N. Toyota, T. Sasaki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Muon-spin rotation (μSR) measurements have been used to study the superconducting vortex properties of layered organic superconductors based on molecular donors such as BEDT-TTF. The μSR is particularly sensitive to the degree of local ordering of pancake vortices and can detect when the pancake layers become decoupled by intrinsic or defect-driven decoupling mechanisms, or by thermally driven motion. Further novel features of the vortex system occur when the field is tilted away from a crystal axis. Knowledge of the vortex phase behaviour allows appropriate parameter regions to be selected for reliable determination of the superconducting penetration depth λ and studies of the temperature dependence of λ have shown a T-linear term at low fields that is suppressed with increasing field. Systematic studies of λ across the range of organic superconductors have revealed a strong correlation between λ and Tc. In contrast to the linear scaling Tc ∝ λ-2 seen in high Tc cuprates, the organics show an overall correlation better described as T c ∝ λ-3. One interpretation is that the superconducting carriers are only a small fraction of the total carrier concentration in these low-Tc superconductors. Understanding this result may give us some important clues about the nature of the superconductivity in the organics.

Original languageEnglish
Pages (from-to)417-420
Number of pages4
JournalSynthetic Metals
Volume152
Issue number1-3
DOIs
Publication statusPublished - 2005 Sep 20

Keywords

  • Magnetic measurements
  • Organic superconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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