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Magnetotransport Irreversibility in Single Crystalline La 0.18 Pr 0.40 Ca 0.42 MnO 3 Thin Films
Author(s) -
Kumari Suman,
Siwach Praveen K.,
Maurya Kamlesh K.,
Awana Veer P. S.,
Singh Hari K.
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201800617
Subject(s) - condensed matter physics , isothermal process , materials science , antiferromagnetism , magnetization , electrical resistivity and conductivity , scaling , ferromagnetism , supercooling , spin glass , phase transition , metal–insulator transition , magnetic field , metal , thermodynamics , physics , geometry , mathematics , quantum mechanics , metallurgy
Magnetotransport irreversibility in single crystalline La 0.18 Pr 0.40 Ca 0.42 MnO 3 thin films is probed with respect to intrinsic electronic phase separation (IEPS). Temperature‐dependent magnetization and resistivity measurements show that (i) the high temperature non‐hysteretic regime is dominated by the antiferromagnetic insulator (AFMI) and the charge ordered (CO) phases; (ii) at intermediate temperatures hysteretic regime is akin to a spin liquid; and (iii) the glass transition occurs at temperature T g below which the spin liquid freezes. The suppression of the ferromagnetic and insulator–metal transitions ( T C and T IM ) during cooling confirms supercooled magnetic liquid. Magnetic field‐dependent resistivity ( ρ–H ) measured during cooling and warming highlights the differences in the spin‐ordered structures through (i) reversible behavior at T < T g ; (ii) colossal irreversibility in the isothermal cooling and warming ρ–H at T g < T < T C / T IM ; and (iii) reversible ρ–H at low/moderate fields but irreversible behavior at high fields at T > T IM (warming). The present study demonstrates that the scaling of area between the isothermal cooling and warming cycle ρ–H curves with temperature mimics the ρ–T behavior and hence also reflects the insulator–metal transition. The observed irreversibility and the area scaling in the different spin regimes have been explained in terms of the intrinsic electronic phase separation.