Abstract
We have performed muon spin relaxation ( μ SR ) experiments on undoped CaMnO 3 and electron-doped Ca 1 - x Sm x MnO 3 for x = 0.1 , 0.15 and 0.3. Undoped CaMnO 3 is a G-type antiferromagnet with a Néel temperature of T N ≈ 122 K . The μ SR signal shows three well-defined frequencies, which decrease continuously with temperature and becomes zero at T N ≈ 122 K . The electron-doped Ca 0.85Sm 0.15MnO 3 which shows colossal magnetoresistive (CMR) behaviour, undergoes a structural and magnetic transition at T c ≈ 125 K . The μ SR signal shows heavily damped oscillating signal. The frequency decreases continuously with increasing temperature. Ca 0.9Sm 0.1MnO 3 and Ca 0.7 Sm 0.3MnO 3 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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