Off-diagonal Seebeck effect and anisotropic thermopower in Bi2Sr2CaCu2O8 thin films

Th. Zahner; R. Schreiner; R. Stierstorfer; O. Kus; S. T. Li; R. Roessler; J. D. Pedarnig; D. Bäuerle; H. Lengfellner

doi:10.1209/epl/i1997-00521-4

All issues

Volume 40 / No 6 (December II 1997)

Europhys. Lett., 40 6 (1997) 673-678

Abstract

Issue		Europhys. Lett. Volume 40, Number 6, December II 1997


Page(s)		673 - 678
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1997-00521-4
Published online		01 September 2002

Europhys. Lett., 40 (6), pp. 673-678 (1997)

Off-diagonal Seebeck effect and anisotropic thermopower in Bi₂Sr₂CaCu₂O₈ thin films

Th. Zahner¹, R. Schreiner¹, R. Stierstorfer¹, O. Kus¹, S. T. Li², R. Roessler², J. D. Pedarnig², D. Bäuerle² and H. Lengfellner¹

¹ Institut für Experimentelle und Angewandte Physik, Universität Regensburg 93040 Regensburg, Germany
² Institut für Angewandte Physik, Johannes-Kepler-Universität Linz, 4040 Linz, Austria

Received: 9 July 1997
Accepted: 1 November 1997

Abstract

The anisotropy $\Delta S$ of the thermopower in thin films of the high-T_c superconductor $\rm Bi_{2} Sr_{2} CaCu_{2} O_{8}$ is investigated using off–c-axis epitaxial film growth and the off-diagonal Seebeck effect. The measurements represent a new method for the investigation of anisotropic transport properties in solids, taking advantage of the availability of oriented grown crystalline thin films instead of using bulk crystals. First results for the temperature dependence $\Delta S(T)$ in $\rm Bi_{2}Sr_{2}CaCu_{2}O_{8}$ thin films are presented and described within a two-band model. Subjecting the films to heat treatments in different gases at relatively low temperatures, $\Delta S$ could reversibly be changed in a wide range.

PACS: 73.50.Lw – Thermoelectric effects / 74.72.Hs – Bi-based cuprates / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)

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