Investigations of the zero-field (a,b)-plane conductivity of YBa2Cu3O7-d near the critical temperature
Crisan, A., Gordeev, S.N., Manton, S., Rassau, A.P., Popa, S., Beduz, C., De Groot, P.A.J., Gagnon, R. and Taillefer, L. (1998) Investigations of the zero-field (a,b)-plane conductivity of YBa2Cu3O7-d near the critical temperature. Physica C: Superconductivity, 309, (1-2), 1-7. (doi:10.1016/S0921-4534(98)00578-4).
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The resistive transition R(T) and the current–voltage characteristics (I–V) in the range 10−9–10−6 V and close to the critical temperature (Tc) were measured in a single-grain of melt-textured YBa2Cu3O7−δ (YBCO) and in a detwinned YBCO single-crystal, with the transport current parallel to the (a,b) planes and in zero external magnetic field using a SQUID picovoltmeter. In the case of the melt-textured sample, we measured the I–V curves also at higher levels of dissipation. For T<Tc, we interpreted the lower part of the I–V curves in the framework of the Jensen–Minnhagen model of current-induced unbinding of thermally-created vortex–antivortex pairs, which leads to V∝I(I−Ic1)a−1. Our results confirm a recently proposed current–temperature (I–T) phase diagram by S.W. Pierson. In addition, we determined for the first time the dependence of the characteristic (unbinding) current Ic1 with t=1−T/Tc for temperatures very close to Tc and low transport currents.
|Keywords:||YBCO, critical temperature, current, voltage|
|Subjects:||T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QC Physics
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||17 Nov 2006|
|Last Modified:||02 Mar 2012 11:25|
|Contributors:||Crisan, A. (Author)
Gordeev, S.N. (Author)
Manton, S. (Author)
Rassau, A.P. (Author)
Popa, S. (Author)
Beduz, C. (Author)
De Groot, P.A.J. (Author)
Gagnon, R. (Author)
Taillefer, L. (Author)
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