Phonon density of states of PbFeBO4, PbMnBO4, and PbFe0.5Mn0.5BO4 studied by inelastic neutron scattering
Mullite-type PbFeBO4, PbMnBO4 and PbFe0.5Mn0.5BO4 show negative thermal expansion in the a-axis below and above the spin-ordering temperatures. Grüneisen parameters of some low frequency optical modes are negative as obtained from the DFT calculations. Raman spectra showed strong softening/hardening effects, confirming the spin-phonon interactions. Temperature-dependent phonon density of states can provide both phonon-phonon and spin-phonon interactions, leading to understand the anisotropic lattice thermal expansion. We therefore ask for 7 days of beamtime at IN4C and IN6.
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M. Mangir Murshed; Thorsten M. Gesing; GOGOLIN Mathias and KOZA Michael Marek. (2018). Phonon density of states of PbFeBO4, PbMnBO4, and PbFe0.5Mn0.5BO4 studied by inelastic neutron scattering. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-456
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