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

In this paper we report measurements of 1/f noise in a crystalline metallic oxide with perovskite structure down to 4.2K. The results show existence of localized excitations with average activation energy \(\approx\) 70-80 meV which produce peak in the noise at T \(\approx\) 35-40K. In addition, it...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Ghosh, Arindam, Raychaudhuri, A K, Sreekala, R, Rajeswari, M, Venkatesan, T
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 28.11.1998
Subjects
Crystal structure
Crystallinity
Excitation
Noise
Perovskite structure
Perovskites
Online AccessGet full text

Cover

More Information
Summary:In this paper we report measurements of 1/f noise in a crystalline metallic oxide with perovskite structure down to 4.2K. The results show existence of localized excitations with average activation energy \(\approx\) 70-80 meV which produce peak in the noise at T \(\approx\) 35-40K. In addition, it shows clear evidence of tunnelling type two-level-systems (as in glasses) which show up in noise measurements below 30K.
ISSN:2331-8422
DOI:10.48550/arxiv.9811398