Magnetocaloric effect of electron-doped manganite La{sub 0.9}Te{sub 0.1}MnO{sub 3}

Journal Article · Wed Aug 01 00:00:00 EDT 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2767383· OSTI ID:21057476

Yang, J; Lee, Y P; Li, Y ^[1]

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1. Quantum Photonic Science Research Center, Hanyang University, Seoul 133-791, Korea and Department of Physics, Hanyang University, Seoul 133-791 (Korea, Republic of)

The magnetocaloric effect of an electron-doped manganite La{sub 0.9}Te{sub 0.1}MnO{sub 3} has been investigated. The sample of La{sub 0.9}Te{sub 0.1}MnO{sub 3} undergoes the paramagnetic-ferromagnetic transition at 239 K. It is obtained that the effective magnetic moment ({mu}{sub eff}=4.923{mu}{sub B}) and the saturation moment ({mu}{sub S}=4.08{mu}{sub B}/Mn) are close to the respective expected values. The isothermal magnetization versus applied magnetic field at various temperatures between 180 and 300 K was measured, and the temperature dependence of magnetic entropy change |{delta}S{sub M}| for La{sub 0.9}Te{sub 0.1}MnO{sub 3} was understood. It is found that the sample shows a large magnetic entropy change near T{sub C} and the magnitude of magnetic entropy change is comparable to some hole-doped manganites. However, the relative cooling power of the electron-doped manganite La{sub 0.9}Te{sub 0.1}MnO{sub 3} is higher than that of some hole-doped manganites, which is an advantage for the engineer to design the magnetic refrigeration materials. Moreover, the temperature dependence of magnetic entropy change |{delta}S{sub M}| cannot be explained well based on the Landau theory of phase transition, and the contribution of the Jahn-Teller effect needs to be taken into account for La{sub 0.9}Te{sub 0.1}MnO{sub 3}.

• OSTI ID: 21057476
• Journal Information: Journal of Applied Physics, Vol. 102, Issue 3; Other Information: DOI: 10.1063/1.2767383; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADIABATIC DEMAGNETIZATION
CERAMICS
DOPED MATERIALS
ELECTRONS
ENTROPY
FERROMAGNETIC MATERIALS
JAHN-TELLER EFFECT
LANTHANUM COMPOUNDS
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANATES
PARAMAGNETISM
PHASE TRANSFORMATIONS
REFRIGERATION
TELLURIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K