2007/07/02 by Clarina dela Cruz, C. R. dela Cruz, B. Lorenz +9 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Dielectric #Dielectric properties of ceramics #Ferroelectric and Piezoelectric Materials #Ferroelectricity #Hydrostatic pressure #Materials science #Multiferroics #Multiferroics and related materials #Phase transition #Physical chemistry #Physics #Polarization (electrochemistry) #Quantum mechanics #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.76.174106
8 pages, 6 figures, submitted for review in Phys. Rev. B
arxiv created 2007/07/02 · openalex publication_date 2007/11/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Measurements of ferroelectric polarization and dielectric constant were done on RMn2O5 (R=Tb,Dy,Ho) with applied hydrostatic pressures of up to 18\phantom\rule0.3em0exkbar. At ambient pressure, distinctive anomalies were observed in the temperature profile of both physical properties at critical temperatures marking the onset of long range antiferromegnetic order (TN1) and ferroelectricity (TC1), as well as at temperatures when anomalous changes in the polarization, dielectric constant, and spin wave commensurability have been previously reported. In particular, the step in the dielectric constant at low temperatures (TC2), associated with both a drop in the ferroelectric polarization and an incommensurate magnetic structure, was shown to be suddenly quenched upon passing an R-dependent critical pressure. This was shown to correlate with the stabilization of the high ferroelectric polarization state, which is coincident with the commensurate magnetic structure. The observation is suggested to be due to a pressure-induced phase transition into a commensurate magnetic structure, as exemplified by the pressure-temperature (p\text\ensuremath-T) phase diagrams constructed in this work. The p\text\ensuremath-T phase diagrams are determined for all three compounds.