2000/07/18 by V. Kiryukhin, B. G. Kim, V. Podzorov +9 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Charge ordering #Condensed matter physics #Electrical resistivity and conductivity #Insulator (electricity) #Magnetic and transport properties of perovskites and related materials #Materials science #Metal #Metallurgy #Metal–insulator transition #Phase transition #Physics #Quantum mechanics #Rare-earth and actinide compounds #cond-mat
paper · pdf · doi:10.1103/physrevb.63.024420
9 pages, 9 encapsulated eps figures
arxiv created 2000/07/18 · openalex publication_date 2000/12/19 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
The insulator-metal transition in single crystal La_5/8\ensuremath-yPryCa3/8MnO3 with y\ensuremath≈0.35 was studied using synchrotron x-ray diffraction, electric resistivity, magnetic susceptibility, and specific heat measurements. Despite the dramatic drop in the resistivity at the insulator-metal transition temperature TMI, the charge-ordering (CO) peaks exhibit no anomaly at this temperature and continue to grow below TMI. Our data suggest then, that in addition to the CO phase, another insulating phase is present below TCO. In this picture, the insulator-metal transition is due to the changes that occur within this latter phase. The CO phase does not appear to play a major role in this transition. We propose that a percolationlike insulator-metal transition occurs via the growth of ferromagnetic metallic domains within the parts of the sample that do not exhibit charge ordering. Finally, we find that the low-temperature phase-separated state is unstable against x-ray irradiation, which destroys the CO phase at low temperatures.