Multiple Changes of Order of the Vortex Melting Transition in BSCCO with Dilute Columnar Defects

Details Multiple Changes of Order of the Vortex Melting Transition in BSCCO with Dilute Columnar Defects Multiple Changes of Order of the Vortex Melting Transition in BSCCO with Dilute Columnar Defects

2008-02-05

arxiv.org/abs/0802.0574v3

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.157003

A low concentration of columnar defects is reported to transform a first-order vortex lattice melting line in BSCCO crystals into alternating segments of first-order and second-order transitions separated by two critical points. As the density of CDs is increased, the critical points shift apart and the range of the intermediate second-order transition expands. A third, low temperature critical point was also observed in one sample. The measurement of equilibrium magnetization and the mapping of the melting line down to 27K was made possible by employment of the shaking technique.

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