Vortex dynamics at rf frequencies in Bi2Sr2CaCu2O8 single crystals

Sudershan, Y. S. ; Rastogi, Amit ; Bhat, S. V. ; Grover, A. K. ; Yamaguchi, Y. ; Oka, K. ; Nishihara, Y. (1998) Vortex dynamics at rf frequencies in Bi2Sr2CaCu2O8 single crystals Physica C: Superconductivity, 297 (3-4). pp. 253-261. ISSN 0921-4534

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09214...

Related URL: http://dx.doi.org/10.1016/S0921-4534(97)01895-9

Abstract

We have studied the low magnetic field high temperature region of the H-T phase diagram of Bi2Sr2CaCu2O8 single crystals using the technique of non-resonant rf response at a frequency of 20 MHz. With Hrf||a, H||c, the isothermal magnetic field scans below TC show that the frequency f(H) of the tank circuit decreases continuously with increase in H before saturating at H~HD(T). Such a decrease in f(H) reflects increasing rf penetration into the weakly screened region between CuO bilayers. The saturation of f(H) at its lowest value for H~HD(T) indicates complete rf penetration (and hence the disappearance of field dependence) due to the vanishing of the screening rf currents Irfc in those regions or equivalently when the phase coherence between adjacent superconducting layers vanishes. Therefore HD(T) represents the decoupling of the adjacent superconducting bilayers, and hence also a 3D to 2D decoupling transition of the vortex structure. Simultaneous monitoring of the field dependent rf power dissipation P(H) shows a maximum in dP/dH at HD(T). The observed HD(T) line in many crystals is in excellent agreement with the (1/t-1) behavior proposed for decoupling.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Bi2212; rf Absorption; Vortex Decoupling; H-T Phase Diagram
ID Code:14374
Deposited On:12 Nov 2010 09:02
Last Modified:23 May 2011 06:42

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