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Anomalies of magnetoelastic properties and insulator-metal phase transitions induced by a magnetic field in substituted praseodymium manganites |
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| Authors: | Yu F Popov A M Kadomtseva G P Vorob’ev K I Kamilov V Yu Ivanov A A Mukhin A M Balbashov |
| Institution: | (1) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia;(2) General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 117942, Russia;(3) Moscow Power Institute, ul. Krasnokazarmennaya 14, Moscow, 105835, Russia |
| Abstract: | The magnetostriction of Pr0.6Ca0.4MnO3 and Pr0.65Ca0.28Sr0.07MnO3 manganite crystals is investigated in pulsed magnetic fields up to 250 kOe. The field-induced phase transitions from the charge-ordered antiferromagnetic (paramagnetic) state to the metallic ferromagnetic state are studied. It is found that these transitions are accompanied by abrupt negative jumps in the longitudinal and transverse magnetostrictions and a strong hysteresis at low temperatures. The threshold fields of transitions are determined, and the H-T phase diagrams are constructed. |
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