We present recent μSR results on a single crystal of pure LaMnO3, showing the existence of two equal amplitude spontaneous muon frequencies below TN = 139.5 K. The local fields are 0.9510(3) and 0.6290(2) T at T = 0. The lower frequency site is identified by virtue of the dependence of the frequency on the applied field. The magnetic properties of the end member material are briefly discussed on the basis of these observations. Zero-field precessions are also observed in La0.92Ca0.08MnO3 and in La0.85Ca0.15MnO3 single crystals. A new magnetic phase appears in both of them between the ordered low-temperature and the paramagnetic high-temperature phases.
Magnetic order in pure LaMnO3 and in Ca-doped single crystals / R. DE RENZI; G. ALLODI; M. CESTELLI GUIDI; GUIDI G.; M. HENNION; L. PINSARD; A. AMATO. - In: PHYSICA. B, CONDENSED MATTER. - ISSN 0921-4526. - 289(2000), pp. 52-55. [10.1016/S0921-4526(00)00251-9]
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