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Anomalous Magnetotransport Properties of Bi Doped La 0.67 Sr 0.33 MnO 3
Author(s) -
Kambhala Nagaiah,
Samatham S. Shanmukharao,
Venkatesh R.,
Ganesan V.,
Angappane S.
Publication year - 2018
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.201700194
Subject(s) - magnetoresistance , condensed matter physics , antiferromagnetism , materials science , ferromagnetism , colossal magnetoresistance , metal , doping , charge ordering , atmospheric temperature range , metal–insulator transition , magnetic field , charge (physics) , physics , thermodynamics , metallurgy , quantum mechanics
We have studied the magnetotransport properties of La 0.67− x Bi x Sr 0.33 MnO 3 ( x = 0, 0.3, 0.4, 0.5). The x ≤ 0.3 samples show metal–insulator transitions, whereas x ≥ 0.4 samples exhibit an insulating behaviour at zero field. Notably, two low‐temperature upturns were observed for La 0.37 Bi 0.3 Sr 0.33 MnO 3 , which indicates the existence of two different mechanisms. La 0.27 Bi 0.4 Sr 0.33 MnO 3 shows field‐induced metallic behavior due to the melting of charge ordering with applied magnetic field. A large magnetoresistance of ∼100% is observed for La 0.27 Bi 0.4 Sr 0.33 MnO 3 at ∼90 K. On the other hand, La 0.37 Bi 0.3 Sr 0.33 MnO 3 exhibits a nearly constant large magnetoresistance of ∼80% between ∼30 and 250 K, which decreases outside this temperature range. The observed anomalous low‐temperature magnetotransport properties of La 0.67− x Bi x Sr 0.33 MnO 3 are shown to arise from the coexisting phases of ferromagnetic metallic and antiferromagnetic charge‐ordered insulating states.