Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1816756 | Physica B: Condensed Matter | 2006 | 4 Pages |
Abstract
We have performed muon spin relaxation (μSR) experiments on undoped CaMnO3 and electron-doped Ca1-xSmxMnO3 for x=0.1,0.15 and 0.3. Undoped CaMnO3 is a G-type antiferromagnet with a Néel temperature of TNâ122K. The μSR signal shows three well-defined frequencies, which decrease continuously with temperature and becomes zero at TNâ122K. The electron-doped Ca0.85Sm0.15MnO3 which shows colossal magnetoresistive (CMR) behaviour, undergoes a structural and magnetic transition at Tcâ125K. The μSR signal shows heavily damped oscillating signal. The frequency decreases continuously with increasing temperature. Ca0.9Sm0.1MnO3 and Ca0.7 Sm0.3MnO3 show only relaxation and do not show any frequency. We have determined temperature variation of the muon relaxation rates below and above the magnetic and charge order transitions under zero and longitudinal magnetic fields, which give important information about the nature of these transitions.
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Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Tapan Chatterji, D. Andeica, R. Suryanarayanan, A. Revcolevschi,