Spin-phonon coupling in hexagonal Sr0.6Ba0.4MnO3

Abstract We have probed the magnetic properties of hexagonal Sr 0.6 Ba 0.4 MnO 3 (SBMO) and its correlations with the vibrational spectra. Magnetization measurements reveal two antiferromagnetic transitions at 325 K and at 227 K. Temperature dependent Raman spectra of SBMO suggest that though structural symmetry is maintained across the transition temperatures, imprints of these magnetic transitions are noticed in anomalous behavior of Mn displacement E 1g mode position in the same temperature range. A 1g mode related to non-magnetic oxygen ion does not show such anomaly and follows an anharmonic behavior. Deviation from the anharmonic behavior of the E 1g mode and its absence in A 1g highlight the spin-phonon coupling in SBMO. The spin-phonon coupling parameter is evaluated to be 2.2 cm −1 .