Transport properties of NdBa2Cu3O6+x
ceramics at the edge of the superconducting region upon a decrease in carrier density as a result of oxygen disordering in the Cu-O
x
planes |
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| Authors: | V F Gantmakher V V Sinitsyn G É Tsydynzhapov N A Doroshenko V P D’yakonov |
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| Institution: | (1) Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia;(2) Donetsk Physicotechnical Institute, Ukrainian National Academy of Sciences, 340114 Donetsk, Ukraine |
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| Abstract: | An initially nonsuperconducting ceramic sample with the composition NdBa2Cu3O6+x
is brought, by means of pressure and quenching, to a state with a high carrier density and a superconducting transition,
after which it is returned to the initial state by gradual annealing in several steps. The evolution of the magnetoresistance
of the sample showed that even in the most resistive state realized in the experiment the superconducting interaction influences
the resistance of the sample at fields all the way up to 5–6 T. In an 8 T field the change in resistance in this state in
the temperature interval from 0.4 K to 20 K is described well by a logarithmic law ΔR∝ logT.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 6, 475–480 (25 March 1997) |
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