Journal
PHYSICAL REVIEW B
Volume 71, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.71.064506
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A large nonlinear response of a single crystal of ZrB12 to an ac field (frequency 40-2500 Hz) for H-0>H-c2 has been observed. Direct measurements of the ac wave form and the exact numerical solution of the Ginzburg-Landau equations, as well as the phenomenological relaxation equation, permit the study of the surface superconducting state dynamics. It is shown that the low-frequency response is defined by transitions between the metastable superconducting states under the action of an ac field. The relaxation rate that determines such transition dynamics is found.
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