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Low-energy excitations in crystalline perovskite oxides: Evidence from noise experiments

Ghosh, Arindam and Raychaudhuri, AK and Sreekala, R and Rajeswari, M and Venkatesan, T (1998) Low-energy excitations in crystalline perovskite oxides: Evidence from noise experiments. In: Physical Review B: Condensed Matter, 58 (22). pp. 14665-14668.

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Official URL: http://adsabs.harvard.edu/abs/1998cond.mat.11398G


In this paper we report measurements of 1/f noise in a crystalline metallic oxide with perovskite structure down to 4.2 K. The results show existence of localized excitations with average activation energy approximate to 70-80 meV which produce a peak in the noise at T approximate to 35-40 K. Ln addition, it shows clear evidence of tunnelling-type two-level systems las in glasses) which show up in noise measurements below 30 K.

Item Type: Journal Article
Publication: Physical Review B: Condensed Matter
Publisher: American Physical Society
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 22 Dec 2009 07:43
Last Modified: 19 Sep 2010 05:25
URI: http://eprints.iisc.ac.in/id/eprint/18876

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