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Understanding the magnetic dynamics and magnetostructural coupling in the paramagnetic phase of TbMnO3 by muon-spin spectroscopy
Authors: Vilarinho, R; Vilao, RC; Alberto, H; Marinopoulos, AG; Gil, JM; Luetkens, H; Guguchia, Z; Mihalik, M; Mihalik Jr, M; Moreira, JA
Ref.: Phys. Rev. B 108 (17), 174401 (2023)
Abstract: In this work we present a comprehensive study of the spin dynamics and fluctuations in the ordered magnetic phases of the prototype multiferroic material TbMn O 3 . From the temperature dependence of the dynamical and static components of the time-dependent asymmetry, we demonstrate the existence of strong local magnetic-field disorder arising from the modulated Mn 3 + spin arrangement and the effect of the Tb 3 + ordering at low temperatures. We provide evidence for an unusual magnetostructural coupling in the paramagnetic phase of TbMn O 3 by means of muon spin spectroscopy. No short-range magnetic ordering definitively occurs in the paramagnetic phase and the unusual properties found in the temperature dependence of the magnetic susceptibility are due to a magnetostructural coupling, likely involving oxygen displacements.
