Peak effect and vortex phase diagram of YBa2Cu4O 8

Kazumasa Katayama, Yuzo Yoshida, Shuichi Kawamata, Takekazu Ishida, Kenji Shibata, Takahiko Sasaki, Norio Kobayashi, Seiji Adachi, Setsuko Tajima

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


Magnetization measurements of Y124 single crystals have been carried out up to 16 T by means of the torque magnetometer in an inclined magnetic field from the c-axis by 5°. At temperatures near Tc, the peak line seems to start from a critical point (2200 G, 76 K). However, the melting line has been observed by means of the AC susceptibility in fields higher than 2200 G. The peak onset field ∼2200 G is rather independent of temperature at temperatures above 40 K while it increases rapidly at temperatures below 35 K. The peak line always increases as temperature decreases, and it shows anomaly at 25 K. These profiles are different from Y123 and Bi2212, for which the positive temperature derivative or the T-independent peak has been known so far. The nature of the melting transition remains to be clarified while the AC susceptibility is suggestive of the first-order transition.

Original languageEnglish
Pages (from-to)382-385
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Issue numberPART 1
Publication statusPublished - 2003 Oct
EventProceedings of the 15th International Symposium on Superconduc - Yokohama, Japan
Duration: 2002 Nov 112002 Nov 13


  • Peak effect
  • Phase diagram
  • Single crystal
  • Vortex
  • YBaCuO


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