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Active and Passive Electronic Components
Volume 15 (1993), Issue 3-4, Pages 147-153
http://dx.doi.org/10.1155/1993/32872

Thermoelectric Power of YBa2Cu3O7-X and YBa2Cu4O8 Under Pressure

Materials Science Division, National Aeronautical Laboratory, Bangalore 560017, India

Received 15 November 1992; Accepted 16 December 1992

Copyright © 1993 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Thermoelectric power (TEP) of YBa2Cu3O7-X (123) and YBa2Cu4O8 (124) samples are measured as a function of pressure. The TEP of an as-sintered 123 polycrystalline sample shows a broad maximum around 1.25 GPa whereas that of the cold-pressed sample decreases steadily. The ab-plane TEP of 123 single crystal decreases monotonically and the c-axis TEP exhibits a maximum around 1.5 GPa. Disappearance of the broad maximum in the polycrystalline sample upon cold-pressing is interpreted in terms of the crystallite orientation occurring under pressure. TEP of the 124 polycrystalline sample decreases sharply up to 4.5 GPa and at a lower rate with further increase in pressure, a trend similar to that is observed in the variation of Tc as a function of pressure.