Mechanism of the Lorentz-force-independent dissipation in Bi 2 Sr 2 </mml:mrow…
1991; American Physical Society; Volume: 67; Issue: 19 Linguagem: Inglês
10.1103/physrevlett.67.2737
ISSN1092-0145
AutoresYoichi Ando, Naofumi Motohira, K. Kitazawa, J. Takeya, S. Akita,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoA novel power law was found above 65 K in the I-V characterististics of ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{\mathit{y}}$ single crystals with the magnetic field perpendicular to the c axis. At 80 K, the power-law exponent decreased sharply up to 1.5 T but remained nearly constant above it, suggesting an abrupt crossover to a different mechanism. An unusual field dependence of resistivity was also found, which cannot be explained by simple flux-flow theory. The above novel features of the Lorentz-force-independent dissipation can be consistently explained by a model based on two-dimensional vortex-antivortex pair breaking.
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