Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe11.4Si1.6

Feng Xia Hu; Bao Gen Shen; Ji Rong Sun; Zhao Hua Cheng; Guang Hui Rao; Xi Xiang Zhang

doi:10.1063/1.1375836

Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe_11.4Si_1.6

Feng Xia Hu^*, Bao Gen Shen, Ji Rong Sun, Zhao Hua Cheng, Guang Hui Rao, Xi Xiang Zhang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Magnetization of the compound LaFe_11.4Si_1.6 with the cubic NaZn₁₃-type structure was measured as functions of temperature and magnetic field around its Curie temperature T_C of ∼208 K. It is found that the magnetic phase transition at T_C is completely reversible. Magnetic entropy change ΔS, allowing one to estimate the magnetocaloric effect, was determined based on the thermodynamic Maxwell relation. The achieved magnitude of |ΔS| reaches 19.4 J/kg K under a field of 5 T, which exceeds that of most other materials involving a reversible magnetic transition in the corresponding temperature range. The large entropy change is ascribed to the sharp change of magnetization, which is caused by a large negative lattice expansion at the T_C. An asymmetrical broadening of |ΔS| peak with increasing field was observed, which is resulted from the field-induced itinerant-electron metamagnetic transition from the paramagnetic to ferromagnetic state above the T_C.

Original language	English (US)
Pages (from-to)	3675-3677
Number of pages	3
Journal	Applied Physics Letters
Volume	78
Issue number	23
DOIs	https://doi.org/10.1063/1.1375836
State	Published - Jun 4 2001
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe11.4Si1.6",

abstract = "Magnetization of the compound LaFe11.4Si1.6 with the cubic NaZn13-type structure was measured as functions of temperature and magnetic field around its Curie temperature TC of ∼208 K. It is found that the magnetic phase transition at TC is completely reversible. Magnetic entropy change ΔS, allowing one to estimate the magnetocaloric effect, was determined based on the thermodynamic Maxwell relation. The achieved magnitude of |ΔS| reaches 19.4 J/kg K under a field of 5 T, which exceeds that of most other materials involving a reversible magnetic transition in the corresponding temperature range. The large entropy change is ascribed to the sharp change of magnetization, which is caused by a large negative lattice expansion at the TC. An asymmetrical broadening of |ΔS| peak with increasing field was observed, which is resulted from the field-induced itinerant-electron metamagnetic transition from the paramagnetic to ferromagnetic state above the TC.",

author = "Hu, {Feng Xia} and Shen, {Bao Gen} and Sun, {Ji Rong} and Cheng, {Zhao Hua} and Rao, {Guang Hui} and Zhang, {Xi Xiang}",

year = "2001",

month = jun,

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doi = "10.1063/1.1375836",

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volume = "78",

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journal = "Applied Physics Letters",

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T1 - Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe11.4Si1.6

AU - Hu, Feng Xia

AU - Shen, Bao Gen

AU - Sun, Ji Rong

AU - Cheng, Zhao Hua

AU - Rao, Guang Hui

AU - Zhang, Xi Xiang

PY - 2001/6/4

Y1 - 2001/6/4

N2 - Magnetization of the compound LaFe11.4Si1.6 with the cubic NaZn13-type structure was measured as functions of temperature and magnetic field around its Curie temperature TC of ∼208 K. It is found that the magnetic phase transition at TC is completely reversible. Magnetic entropy change ΔS, allowing one to estimate the magnetocaloric effect, was determined based on the thermodynamic Maxwell relation. The achieved magnitude of |ΔS| reaches 19.4 J/kg K under a field of 5 T, which exceeds that of most other materials involving a reversible magnetic transition in the corresponding temperature range. The large entropy change is ascribed to the sharp change of magnetization, which is caused by a large negative lattice expansion at the TC. An asymmetrical broadening of |ΔS| peak with increasing field was observed, which is resulted from the field-induced itinerant-electron metamagnetic transition from the paramagnetic to ferromagnetic state above the TC.

AB - Magnetization of the compound LaFe11.4Si1.6 with the cubic NaZn13-type structure was measured as functions of temperature and magnetic field around its Curie temperature TC of ∼208 K. It is found that the magnetic phase transition at TC is completely reversible. Magnetic entropy change ΔS, allowing one to estimate the magnetocaloric effect, was determined based on the thermodynamic Maxwell relation. The achieved magnitude of |ΔS| reaches 19.4 J/kg K under a field of 5 T, which exceeds that of most other materials involving a reversible magnetic transition in the corresponding temperature range. The large entropy change is ascribed to the sharp change of magnetization, which is caused by a large negative lattice expansion at the TC. An asymmetrical broadening of |ΔS| peak with increasing field was observed, which is resulted from the field-induced itinerant-electron metamagnetic transition from the paramagnetic to ferromagnetic state above the TC.

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Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe_11.4Si_1.6

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