We present temperature-magnetic-field-and pressure-dependent Raman scattering studies of single crystal Mn3O4, combined with temperature- and field-dependent x-ray diffraction studies, revealing the novel magnetostructural phases in Mn3O4. Our temperature-dependent studies show that the commensurate magnetic transition at T2=33 K in the binary spinel Mn3O4 is associated with a structural transition from tetragonal to orthorhombic structures. Field-dependent studies show that the onset and nature of this structural transition can be controlled with an applied magnetic field, and reveal evidence for a field-tuned quantum phase transition to a tetragonal spin-disordered phase for H[11̄0]. Pressure-dependent Raman measurements indicate that the magnetic easy-axis direction in Mn3O4 can be controlled-and the ferrimagnetic transition temperature increased-with applied pressure. Finally, combined pressure- and magnetic-field-tuned Raman measurements reveal a rich magnetostructural phase diagram-including a pressure- and field-induced magnetically frustrated tetragonal phase in the P-H (pressure-magnetic field) phase diagram-that can be generated in Mn 3O4 with applied pressure and magnetic field.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Nov 18 2011|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics