High-pressure structural stability of multiferroic hexagonal RMnO3 (R=Y, Ho, Lu)
Structural changes in RMnO{sub 3} (R= Y, Ho, Lu) under high pressure were examined by synchrotron x-ray diffraction methods at room temperature. Compression occurs more readily in the ab plane than along the c axis. With increased pressure, a pressure-induced hexagonal to orthorhombic phase transition was observed starting at {approx}22 GPa for Lu(Y)MnO{sub 3}. When the pressure is increased to 35 GPa, a small volume fraction of Lu(Y)MnO{sub 3} is converted to the orthorhombic phase and the orthorhombic phase is maintained on pressure release. High-pressure infrared absorption spectroscopy and Mn K-edge near-edge x-ray absorption spectroscopy confirm that the hexagonal P6{sub 3}cm structure is stable below {approx}20 GPa and the environment around the Mn ion is not changed. Shifts in the unoccupied p-band density of states with pressure are observed in the Mn K-edge spectra. A schematic pressure-temperature phase diagram is given for the small ion RMnO{sub 3} system.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE SC OFFICE OF SCIENCE (SC)
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1040501
- Report Number(s):
- BNL-96280-2011-JA; R&D Project: 12106; TRN: US201210%%677
- Journal Information:
- American Physical Society, Vol. 83, Issue 22
- Country of Publication:
- United States
- Language:
- English
Similar Records
R{sub 3}Mn{sub 1.5}CuV{sub 0.5}O{sub 9} (R = Y, Ho, Er, Tm, Yb and Lu) and Lu{sub 3}Mn{sub 3-3x}Cu{sub 2x}V {sub x}O{sub 9}: New noncentrosymmetric oxides related to YMnO{sub 3}
New RMnO{sub 3+δ} (R=Y, Ho; δ≈0.35) phases with modulated structure