Staggered magnetization, critical behavior, and weak ferromagnetic properties of LaMnO3 by muon spin rotation - art. no. 064414

We present a study of a microtwinned single crystal of LaMnO3 by means of i mplanted muons. Two muon stopping sites are identified from the symmetry of the internal field in the ordered phase. The temperature dependence of the se fields yields the behavior of the staggered magnetization,. from which a static critical exponent [beta =0.36(2)] is extracted and discussed. The m uon spin-spin relaxation rate shows a critical slowing down (contrary to pr eliminary findings), with a critical exponent n = 0.7(1), demonstrating the Ising nature of the dynamic fluctuations. The muon precession frequencies vs the applied magnetic field reveal the saturation of the weak ferromagnet ic domain structure originated by the Dzialoshinski-Moriya antisymmetric ex change.