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Phys. Rev. B 63, 020501 (2000) [4 pages]

Vortex matter transition in Bi2Sr2CaCu2O8+y under tilted fields

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S. Ooi1 *, T. Shibauchi1 †, K. Itaka1, N. Okuda1, and T. Tamegai1,2
1Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2CREST, Japan Science and Technology Corporation (JST), Japan

Rapid Communication Received 14 August 2000; published 14 December 2000

Vortex phase diagram under tilted fields from the c axis in Bi2Sr2CaCu2O8+y is studied by local magnetization hysteresis measurements using Hall probes. When the field is applied at large angles from the c axis, an anomaly (Hp*) other than the well-known peak effect (Hp) is found at fields below Hp. The angular dependence of the field Hp* is nonmonotonic and clearly different from that of Hp and depends on the oxygen content of the crystal. The results suggest existence of a vortex matter transition under tilted fields. Possible mechanisms of the transition are discussed.


©2000 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v63/e020501
DOI: 10.1103/PhysRevB.63.020501
PACS: 74.72.Hs, 74.60.Ec, 74.25.Dw, 74.25.Ha

* Present address: National Research Institute for Metals, Sengen 1-2-1, Tsukuba 305-0047, Japan.
† Present address: IBM T.J. Watson Research Center, Yorktown Heights, NY 10598, and MST-STC, Los Alamos National Laboratory, MS-K763, Los Alamos, NM 87545.

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