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Comparing study of magnetic‐ion and nonmagnetic‐ion doping effect at Mn site in La 0.825 Sr 0.175 MnO 3 compound
Author(s) -
Hao Changyi,
Zhao Bangchuan,
Kuang Guangli,
Sun Yuping
Publication year - 2011
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.201147075
Subject(s) - curie temperature , doping , ion , materials science , condensed matter physics , analytical chemistry (journal) , ferromagnetism , chemistry , physics , organic chemistry , chromatography
Structural, magnetic, and transport properties of La 0.825 Sr 0.175 MnO 3 samples doped with magnetic (Fe 3+ , Cr 3+ ) and nonmagnetic (Ga 3+ , Al 3+ ) ions have been studied comparatively. The structure does not change by nonmagnetic ion doping, whereas magnetic ion substitution can change the structure of the system significantly. All the doped samples show a lower Curie temperature as compared to that of the undoped sample. The change of Curie temperature T C for the magnetic‐ion‐doped samples is quite larger than that of the nonmagnetic‐ion‐doped samples. The electron configuration is suggested to play an important role in determining the change of T C for the magnetic‐ion‐doped samples, whereas the decrease of T C in nonmagnetic‐doped samples is considered to originate mainly from the variation of local lattice. The Fe‐doped sample shows semiconducting transport behavior in the whole studied temperature range besides a kink near T C . Except for two obvious M–I transitions, another inflexion‐like anomaly in the ρ ( T ) curve at low temperatures is observed for the Ga‐, Cr‐, and Al‐doped samples and the inflexion is suggested to be related to a two transport channel model in these samples.