Two-dimensional feature of the Nernst effect in normal state of underdoped x single crystals

H. H. Wen; Z. Y. Liu; Z. A. Xu; Z. Y. Weng; F. Zhou; Z. X. Zhao

doi:10.1209/epl/i2003-00569-0

All issues

Volume 63 / No 4 (August 2003)

Europhys. Lett., 63 4 (2003) 583-589

Abstract

Issue		Europhys. Lett. Volume 63, Number 4, August 2003


Page(s)		583 - 589
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-00569-0
Published online		01 November 2003

Europhys. Lett., 63 (4), pp. 583-589 (2003)

Two-dimensional feature of the Nernst effect in normal state of underdoped $\chem{La}$ $_{2-x}$ $\chem{Sr}$ _x $\chem{CuO_4}$ single crystals

H. H. Wen¹, Z. Y. Liu¹, Z. A. Xu², Z. Y. Weng³, F. Zhou¹ and Z. X. Zhao¹

¹ National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences P.O. Box 603, Beijing 100080, PRC
² Physics Department, Zhejiang University - Zhejiang, PRC
³ Center for Advanced Study, Tsinghua University - Beijing 100084, PRC

Received: 14 March 2003
Accepted: 18 June 2003

Abstract

The Nernst effect has been measured for an underdoped and an optimally doped $\chem{La}$ $_{2-x}$ $\chem{Sr}$ _x $\chem{CuO_4}$ single crystal with the magnetic field applied along different directions. For both samples, when $H\parallel c$ , a significant Nernst voltage appears above $T_{\ab{c}}$ and keeps measurable up to a high temperature (100 $\un{K}$ ). However, when $H \parallel ab$ -plane the Nernst signal along the c-axis drops below the noise level quickly above $T_{\ab{c}}$ for the underdoped sample. Moreover, the in-plane Nernst data with field at different angles shows a nice scaling behavior with the c-axis component of the field. All these give a strong indication for a 2D feature of the Nernst signal in the normal state of underdoped cuprate superconductors.

PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.72.Dn – $\chem{La}$ -based cuprates

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