Abstract
In the system Pr0.65Ca0.28Sr0.07MnO3 (PCSM) the field induced metal-insulator transition exhibits changes of the resistivity up to 11 orders in magnitude. In order to study this colossal magnetoresistance effect (CMR) we carried out measurements on a PCSM single crystal, applying a broad range of experimental methods. Resistivity, magnetization and magnetic AC-susceptibility were measured in magnetic fields up to 140 kOe and in the temperature range 1.5 K T 800 K. With decreasing temperature and in zero magnetic field PCSM undergoes a sequence of phase transitions from a paramagnetic into a charge ordered insulating and finally antiferromagnetic phase. The conductivity in these phases is dominated by variable range hopping processes. By applying magnetic fields H ≥ 10 kOe a ferromagnetic metallic phase is induced. This transition exhibits an extremely marked hysteresis behavior. Below T ≈ 100 K metastable states can be generated, in which ferromagnetic metallic and insulating phases coexist.
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Hemberger, J. et al. (2001). Field Induced Metal-Insulator Transition in (Pr:Ca:Sr)MnO3 . In: Bonča, J., Prelovšek, P., Ramšak, A., Sarkar, S. (eds) Open Problems in Strongly Correlated Electron Systems. NATO Science Series, vol 15. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0771-9_25
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DOI: https://doi.org/10.1007/978-94-010-0771-9_25
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-6896-0
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