High-resolution calorimetric study of pb(mg_{1/3}nb_{2/3})o_{3} single crystal |
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Authors: | Nikola Novak Raša Pirc Magdalena Wencka Zdravko Kutnjak |
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Institution: | Institute Jo?ef Stefan, Jamova 39, 1000 Ljubljana, Slovenia. |
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Abstract: | Motivated by the long-standing unresolved enigma of the relaxor ferroelectric ground state, we performed a high-resolution heat capacity and polarization study of the field-induced phase transition in the relaxor ferroelectric single crystal Pb(Mg_{1/3}Nb_{2/3})O_{3} (PMN) oriented along the 110] direction. We show that the discontinuous evolution of polarization as a function of the electric field or temperature is a consequence of a true first order transition from a glassy to ferroelectric state, which is accompanied by an excess heat capacity anomaly and released latent heat. We also find that in a zero field there is no ferroelectric phase transition in bulk PMN at any temperature, indicating that the nonergodic dipolar glass phase persists down to the lowest temperatures. |
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