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Electronic and magnetic phase diagram of polycrystalline Gd1-xCaxMnO3 manganites
Tekijät: Beiranvand A, Tikkanen J, Huhtinen H, Paturi P
Kustantaja: ELSEVIER SCIENCE SA
Julkaisuvuosi: 2017
Lehti:: Journal of Alloys and Compounds
Tietokannassa oleva lehden nimi: JOURNAL OF ALLOYS AND COMPOUNDS
Lehden akronyymi: J ALLOY COMPD
Vuosikerta: 720
Aloitussivu: 126
Lopetussivu: 130
Sivujen määrä: 5
ISSN: 0925-8388
eISSN: 1873-4669
DOI: https://doi.org/10.1016/j.jallcom.2017.05.231
Tiivistelmä
Based on the structural and magnetoresistive properties of Gd1-xCaxMnO3 (GCMO) (0 <= x <= 1) polycrystalline manganites, the magnetic phase diagram of GCMO is deduced. The results show that all of the compounds are ferrimagnetic in the ground state due to polarization of the large magnetic moments of Gd in the opposite direction of Mn ions. However, even disregarding the ordering of the Gd spins in the applied magnetic field direction, the series exhibit complicated magnetic behavior below magnetic ordering temperature (T-C or T-N). In the hole doped region x <= 0. 5, Mn ions order ferromagnetically. In the middle doping region (0.5 <= x <= 0.7), charge ordering can be observed above T-N and, below T-N, Mn ions are in antiferromagnetic state which is more obvious in the case with x = 0.8. In the electron doped region 0.8 <= x <= 0.9, Mn ions reveal magnetic cluster glass properties. Except for x = 0.9, which exhibits degenerate semiconductive behavior, the temperature dependence of resistance shows insulating behavior for all other GCMO concentrations. This can be associated with the small average ionic radius of rare earth cations and colossal magnetoresistance (CMR) is observed for GCMO with x = 0.8 and x = 0.9 when the applied magnetic field exceeds 9 T. (C) 2017 Elsevier B.V. All rights reserved.
Based on the structural and magnetoresistive properties of Gd1-xCaxMnO3 (GCMO) (0 <= x <= 1) polycrystalline manganites, the magnetic phase diagram of GCMO is deduced. The results show that all of the compounds are ferrimagnetic in the ground state due to polarization of the large magnetic moments of Gd in the opposite direction of Mn ions. However, even disregarding the ordering of the Gd spins in the applied magnetic field direction, the series exhibit complicated magnetic behavior below magnetic ordering temperature (T-C or T-N). In the hole doped region x <= 0. 5, Mn ions order ferromagnetically. In the middle doping region (0.5 <= x <= 0.7), charge ordering can be observed above T-N and, below T-N, Mn ions are in antiferromagnetic state which is more obvious in the case with x = 0.8. In the electron doped region 0.8 <= x <= 0.9, Mn ions reveal magnetic cluster glass properties. Except for x = 0.9, which exhibits degenerate semiconductive behavior, the temperature dependence of resistance shows insulating behavior for all other GCMO concentrations. This can be associated with the small average ionic radius of rare earth cations and colossal magnetoresistance (CMR) is observed for GCMO with x = 0.8 and x = 0.9 when the applied magnetic field exceeds 9 T. (C) 2017 Elsevier B.V. All rights reserved.
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