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We present a study of a microtwinned single crystal of LaMnO3 by means of implanted muons. Two muon stopping sites are identified from the symmetry of the internal field in the ordered phase. The temperature dependence of these fields yields the behavior of the staggered magnetization from which a static critical exponent ( = 0.36(2)) is extracted and discussed. The muon spinspin relaxation rate shows a critical slowing down (contrary to preliminary findings) with a critical exponent n = 0.7(1), witnessing the Ising nature of the dynamic fluctuations. The muon precession frequencies vs. applied magnetic field reveal the saturation of the weak ferromagnetic domain structure originated by the Dzialoshinski-Moriya antisymmetric exchange.

physical review. b, condensed matter

Staggered magnetization, critical behavior, and weak ferromagnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LaMnO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>by muon spin rotation

Staggered magnetization, critical behavior, and weak ferromagnetic properties ofLaMnO3by muon spin rotation