In order to investigate the paramagnetic ground state of the colossal magnetoresistance (CMR) Sm0.55Sr0.45MnO₃ compound we have used a wide set of techniques: magnetoresistance, magnetization, high-resolution neutron diffraction, small-angle neutron diffraction, and muon spin relaxation. According to these measurements the paramagnetic ground state would consist of {~}0.8 nm ferromagnetic clusters embedded in a short-range charge/orbital ordered matrix. The CMR effect occurs due to percolation of these ferromagnetic clusters.
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Teresa et al. (2002) studied this question.
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