Ferromagnetism, insulator-metal transition and ... - arXiv
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Ferromagnetism, insulator-metal transition and magnetotransport in Pr0.58Ca0.42MnO3 films: role of microstructural perturbations Vasudha Agarwala, P. K. Siwacha, G. D. Varmab, V. P. S. Awanaa, A. K. Srivastavaa and H. K. Singha# a
CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110012, India Department of Physics, Indian Institute of Technology, Roorkee, Uttarakhand-247667, India
b
Abstract Magnetic and magnetotransport properties of oriented polycrystalline Pr0.58Ca0.42MnO3 thin films prepared in flowing oxygen and air ambient has been investigated. The magnetic ground state of both the films is a frozen cluster glass. In the air annealed film charge order (CO) is quenched and ferromagnetic (FM) transition, which appears at TC148 K is followed by antiferromagnetic (AFM) transition at TN104 K. This film shows self-field hysteretic insulator-metal transition (IMT) at TIMC89 K and TIMW148 K in the cooling and warming cycle, respectively. Application of magnetic field (H) gradually enhances TIMC and TIMW, reduces the thermoresistive hysteresis and TIM (=TIMW-TIMC) diminishes. In contrast, the film annealed in flowing oxygen shows a CO transition at TCO236 K, which is followed by FM and AFM transitions at TC148 K and TN140 K, respectively. This film shows appreciably smaller magnetic moment and does not show IMT upto H=20 kOe. As H is increased to H=30 kOe, IMT having strong thermoresistive hysteresis and sharp resistivity jumps appears at TIMC66K and TIMW144 K in the cooling and warming cycle, respectively. As H increases to higher values the thermoresistive hysteresis is reduced, resistivity jumps are observed to disappear and TIM decreases. In the lower temperature regime (T=5 K and 40 K) the resistivity first decreases slowly with H and then shows sharp drop. The virgin cycle is not recoverable in subsequent cycles. The decrement far more pronounced in the oxygen annealed film and occurs at much higher H suggesting that the frozen cluster glass state is more robust in this film. At temperatures around TC, the -H hysteresis and the magnetic field induced drop in resistivity is more prominent in the oxygen annealed film. In the temperature regime dominated by CO (TC
