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charge-ordering in La_(0.33) Ca_(0.67) MnO_3 Perovskite

Wuhan University Journal of Natural Sciences 2000年第1期5卷 79-79页

作者： WANG Ren-hui GUI Jia-nian Zhu Yi-mei ( Department of Physics, Wuhan University, Wuhan 430072, China Brookhaven National Laboratory, Upton, NY 11973, USA)

Structure model of charge-ordered La_0.33 Ca_0.67 MnO_3, perovskite is one of current focused study in condensed matter physics. There are great discrepancies in previous studies in this field. Our transmission electron microscopy study confirms Wigner crystal model with transverse displacement and is not consisent with the hi-stripe model with longitudinal displacement. We observed incommensurate modulation and anti-phase domains with a displacement vector a_co/3 in charge--ordered La_0.33 Ca_0.67 MnO_3, perovskite.

关键词： charge-ordering perovskite structure La_(0.33) Ca_(0.67) MnO_3 electron microscopy domain structure transition metal oxides colossal magnetoresistance

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Experimental evidence of magnetic training effect of electronic phase in Nd-Ca half-doped manganite

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Journal of Rare Earths 2020年第10期38卷 1076-1085,I0002页

作者： Hamdi Trabelsi Corresponding author.E-mail address:hamdi.trabelsi@outlook.fr.Department of Physics Faculty of SciencesSfax UniversitySfax3000Tunisia

Cooling and heating modes are shown to be able to significantly modify the magnetic and electrical properties of the half-doped perovskite *** present paper reports on a precise investigation of this phenomenon(the so-called training effect) carried out on Nd0.5Ca0.5MnO3 manganite,which allow a fine tuning of the magnetic ground *** of the X-ray diffraction pattern shows that the synthesized sample is single phase and crystallizes in the orthorhombic structure with Pnma space *** magnetometry measurements,we have found that the sample is the seat of interesting phenomena like charge ordering,magnetic phase separation,spin-glass and inverse magnetocaloric ***-field-driven magnetization(M(μ0 H)) measurements evidence the metamagnetic transition which not only depends on field value,but also on the thermal process(cooling or heating).Metamagnetic irreversibility in the magnetic field range(±5 T) and memory effect are observed at low temperatures due to the kinetic arrest *** is worthwhile to mention that the coercive field increases with decreasing temperature and reaches 955 Oe at 20 K,which is sufficiently large compared with that one in the soft magnetic and makes the material quite interesting for spintronic *** electrical resistivity in a zero field was measured on both cooling and warming modes,and the data obtained were fitted by using different theoretical *** low temperatures,the resistivity shows the presence of insulator-metal transition and is found to be in conformity with the magnetization data.A magnetic training effect due to the thermo-magnetic history dependent behavior is observed,where the resistivity is consistently irreversible.

关键词： Pechini method charge-ordering Inverse magnetocaloric effect Kinetic arrest Training effect Electrical resistivity

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