Direct observation of melting of the vortex solid in Bi2Sr2CaCu2O8+delta single crystals


Oral A. , BARNARD J. C. , BENDİNG S. J. , KAYA I. I. , OOİ S., TAMEGAİ T., ...Daha Fazla

PHYSICAL REVIEW LETTERS, cilt.80, sa.16, ss.3610-3613, 1998 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 80 Konu: 16
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1103/physrevlett.80.3610
  • Dergi Adı: PHYSICAL REVIEW LETTERS
  • Sayfa Sayıları: ss.3610-3613

Özet

A scanning Hall probe microscope has been used to directly observe the vortex lattice melting transition in Bi2Sr2CaCu2O8+delta single crystals. Below the melting line, the system settles into a fairly well-ordered vortex solid which undergoes pronounced rotations as the field is increased due to incommensurability effects. Vortex contrast is lost abruptly and discontinuously at the melting line consistent with a first order transition. Vortex profiles appear to be strongly broadened by two-dimensional fluctuations which grow much stronger as the melting line is approached from below, suggesting that melting and decoupling are almost simultaneous.