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Published:
Dec 16, 1994Keywords:
Superconductivity Paraconductivity Fluctuations Dimensionality
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The copyright of a submitted article is only transferred to the publishers if and when the article is accepted for publication. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, electrostatic, mechanical, photocopying, recording or otherwise without the prior written permission of the publishers.
Main Article Content
Paraconductivity of (Bi,Pb) 2Sr2Ca2Cu3-xGexOy
Abstract
The paraconductivity of (Bi, Pb)7Sr2Ca 2Cu 3-x (0 < x < 0.3) superconducting system has been investigated' The paraconductivity above T was determined from the Anderson-Zou fit to the format-state resistivity. Using the Aslamazov-Larkin theory, the dimensionality of the materials was determined. The value of the critical exponent -1) obtained for all the samples indicates that the superconductivity of the system in which Ge replaces Cu is of two-dimensional nature. Thus, the substitution of Ge for Cu does not affect the homogeneity in the superconducting fluctuations in the Cu-0 planes. There is evidence that the a-b plane conductivity dominates, although the crystallites in the polycrystalline samples are randomly oriented
