The evolution of magnetotransport properties with carrier concentration in single crystals

X. G. Luo; X. H. Chen; G. Y. Wang; C. H. Wang; Y. M. Xiong; H. B. Song; X. X. Lu

doi:10.1209/epl/i2006-10011-3

All issues

Volume 74 / No 3 (May 2006)

Europhys. Lett., 74 3 (2006) 526-532

Abstract

Issue		Europhys. Lett. Volume 74, Number 3, May 2006


Page(s)		526 - 532
Section		Interdisciplinary physics and related areas of science and technology
DOI		https://doi.org/10.1209/epl/i2006-10011-3
Published online		29 March 2006

Europhys. Lett., 74 (3), pp. 526-532 (2006)

The evolution of magnetotransport properties with carrier concentration in $\chem{Ca_{3}Co_{4}O_{9+\delta}}$ single crystals

X. G. Luo, X. H. Chen, G. Y. Wang, C. H. Wang, Y. M. Xiong, H. B. Song and X. X. Lu

Hefei National Laboratory for Physical Science at Microscale and Department of Physics University of Science and Technology of China - Hefei, Anhui 230026, PRC

Corresponding author: chenxh@ustc.edu.cn

Received: 15 January 2006
Accepted: 2 March 2006

Abstract

Magnetotransport properties are systematically investigated on $\chem{Ca_{3}Co_{4}O_{9+\delta}}$ single crystals with different carrier concentrations changed by oxygen content. The in-plane resistivity decreases rapidly with increasing carrier concentration. Large negative magnetoresistance was observed in all the single crystals. A magnetic-field–driven sign change of the slope in resistivity at $25\un{K}$ and a magnetic-dependent energy gap in the range 20– $60\un{K}$ are observed in highly doped crystals, while they are absent in the crystals with low carrier concentrations. In addition, a thermally activated resistivity induced by magnetic fields was observed at low temperatures below $12\un{K}$ in highly doped crystals. It is concluded that the magnetotransport properties are quite sensitive to the carrier concentration.

PACS: 81.40.Rs – Electrical properties (related to treatment conditions) / 75.47.-m – Magnetotransport phenomena; materials for magnetotransport / 72.15.Gd – Galvanomagnetic and other magnetotransport effects

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