New commensurate structure induced by pressure in YMn2O5 multiferroic
Among the multiferroics, YMn2O5 was studied in great details; with decreasing temperature, its magnetic phase sequence shows a transition from paramagnetic to an incommensurate (IC) spin structure at 44K, then a transition to a commensurate (CM) magnetic phase at 39K, finally a transition to another IC structure, accompanied by a sudden drop of the polarization, occurs at 23K. A previous study under pressure shows strong changes of the polarization, with a change of sign in the low temperature IC phase at 1GPa, suggesting that a CM phase is being stabilized by pressure. The nature of this phase is however unknown. To study it, we have started high pressure neutron diffraction measurements on G6.1 (LLB) up to 3GPa. Surprisingly, the IC modulation persists at high pressures, well above the change of sign of the polarization (1Gpa). Moreover, we observe a new CM phase with propagation vector (K=0,0,0.5) instead of (0.5,0, 0.25) at ambient pressure. We propose to study this new phase in details on D20 and to apply higher pressures to see if it can be obtained as single phase and better characterized.
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DEUTSCH Maxime; FERNANDEZ DIAZ Maria Teresa; Thomas C. Hansen; MAKAROVA Olga; I. MIREBEAU and PETIT Sylvain. (2014). New commensurate structure induced by pressure in YMn2O5 multiferroic. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2320
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