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Journal of Thermal Analysis and Calorimetry

, Volume 81, Issue 3, pp 591–594 | Cite as

Drastic cooling rate dependence of thermal anomaly associated with the superconducting transition in k-(BEDT-TTF)4Hg2.89Br8

  • S. Yamashita
  • A. Naito
  • Y. Nakazawa
  • K. Saito
  • H. Taniguchi
  • K. Kanoda
  • M. Oguni
Article

Summary

Using a thermal relaxation calorimetry technique, we have measured heat capacities of κ-(BEDT-TTF)4Hg2.89Br8 system under magnetic fields between 0 and 6 T. With the increase of cooling rate from room temperature to liquid helium temperature, we have observed a remarkable but systematic tendency that the thermal anomaly associated with the superconductive transition shifts to the lower temperatures. The course of this phenomenon is attributable to the degree of disorder in the mercury chains which give an incommensurate potential to the superconducting planes.

cooling rate incommensurate lattice organic superconductor 

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • S. Yamashita
    • 1
  • A. Naito
    • 2
  • Y. Nakazawa
    • 3
  • K. Saito
    • 4
  • H. Taniguchi
    • 5
  • K. Kanoda
    • 6
  • M. Oguni
    • 7
  1. 1.Department of Chemistry, Faculty of Science, Tokyo Institute of Technology
  2. 2.Department of Chemistry, Graduate School of Science and Engineerring
  3. 3.Department of Chemistry, Graduate School of Science and Engineerring
  4. 4.Department of Chemistry, Graduate School of Pure and Applied Sciences
  5. 5.Department of Physics, Saitama University
  6. 6.Department of Applied Physics, the University of Tokyo
  7. 7.Department of Chemistry, Graduate School of Science and Engineerring, Tokyo Institute of Technology

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