2005/09/07 by R. S. Freitas, J. F. Mitchell, P. Schiffer
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #Shape Memory Alloy Transformations #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.72.144429
19 pages, 6 figures, to be published in Physical Review B
arxiv created 2005/09/07 · openalex publication_date 2005/10/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have studied the low-frequency dielectric properties of the phase-separated manganite Pr0.7Ca0.3MnO3 as a function of applied magnetic field in the low temperature phase-separated state. The dielectric constant is strongly field dependent and also depends on the magnetic field history of the sample. The dielectric behavior appears to be associated with the hopping of polaronic charge carriers, and we can derive the field dependent hopping energy barrier from the frequency dependence of the dielectric constant. This analysis allows us to associate the metal-insulator transition observed in this material with the field-induced suppression of the polaron activation energy.