2008/02/26 by A. M. L. Lopes, J. P. Araujo, João P. Araújo +4 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Condensed matter physics #Electric field #Magnetic and transport properties of perovskites and related materials #Materials science #Multiferroics and related materials #Phase (matter) #Phase diagram #Phase transition #Physics #Polar #Quantum mechanics #Superconductivity #Transition temperature #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.100.155702
8 pages, 4 figures
arxiv created 2008/02/26 · openalex publication_date 2008/04/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In this Letter a detailed study of the electric field gradient (EFG) across the Pr(1-x)Ca(x)MnO(3) phase diagram and its temperature dependence is given. Clearly, distinct EFG behavior for samples outside or inside the charge order (CO) region are observed. The EFG temperature dependence evidences a new phase transition occurring over the broad CO region of the phase diagram. This transition is discontinuous and occurs at temperatures between the charge ordering and the Néel temperatures. The prominent features observed in the EFG are associated with polar atomic vibrations which eventually lead to a spontaneous local electric polarization below CO transition.