Heffner, R.H.; Sonier, J.E.; MacLaughlin, D.E.; Nieuwenhuys, G.J.; Mezei, F.; Ehlers, G.; Mitchell, J.F.; Cheong, S.-W.: Inhomogeneity in the spin channel of ferromagnetic CMR manganites. Physica B 326 (2003), p. 494-499
10.1016/S0921-4526(02)01675-7
Abstract:
Colossal magnetoresistance manganites are archetypes in which to study the strong coupling between spin, charge and lattice degrees of freedom in materials. We present muon-spin lattice relaxation data in ferromagnetic (FM) ground state materials from the manganites series La1-xCaxMnO3. These measurements reveal several characteristic relaxation modes arising from the strong spin-charge-lattices interactions. We also present results from neutron-spin-echo spectroscopy , which directly measures the spin-spin correlation function in a time domain comparable to ?SR. A qualitative model for FM transition in the manganites involving microscopic phase separation is suggested by these data.