Coexistence of positive and negative magnetic entropy changes in CeMn2(Si1-xGex)2 compounds

doi:10.1088/1674-1056/24/9/097104

Abstract A series of CeMn₂(Si_1-xGe_x)₂ (x=0.2, 0.4, 0.6, 0.8) compounds are prepared by the arc-melting method. All the samples primarily crystallize in the ThCr₂Si₂-type structure. The temperature dependences of zero-field-cooled (ZFC) and FC magnetization measurements show a transition from antiferromagnetic (AFM) state to ferromagnetic (FM) state at room temperature with the increase of the Ge concentration. For x=0.4, the sample exhibits two kinds of phase transitions with increasing temperature: from AFM to FM and from FM to paramagnetic (PM) at around T_N ～ 197 K and T_C ～ 300 K, respectively. The corresponding Arrott curves indicate that the AFM-FM transition is of first-order character and the FM-PM transition is of second-order character. Meanwhile, the coexistence of positive and negative magnetic entropy changes can be observed, which are corresponding to the AFM-FM and FM-PM transitions, respectively.

Keywords: magnetocaloric effect CeMn₂(Si_0.6Ge_0.4)₂ compound metamagnetic transition positive entropy change

Received: 11 May 2015
Revised: 12 June 2015
Accepted manuscript online:

PACS:	71.20.Eh	(Rare earth metals and alloys)
	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	75.50.Ee	(Antiferromagnetics)
	75.47.Np	(Metals and alloys)

Fund: Project supported by the Beijing Natural Science Foundation, China (Grant No. 2152034) and the National Natural Science Foundation of China (Grant Nos. 11274357 and 51271196).

Corresponding Authors: Zuo Wen-Liang, Shen Bao-Gen
E-mail: wlzuo@iphy.ac.cn;shenbg@aphy.iphy.ac.cn

Cite this article:

Zuo Wen-Liang (左文亮), Hu Feng-Xia (胡凤霞), Sun Ji-Rong (孙继荣), Shen Bao-Gen (沈保根) Coexistence of positive and negative magnetic entropy changes in CeMn₂(Si_1-xGe_x)₂ compounds 2015 Chin. Phys. B 24 097104

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Coexistence of positive and negative magnetic entropy changes in CeMn2(Si1-xGex)2 compounds

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Coexistence of positive and negative magnetic entropy changes in CeMn₂(Si_1-xGe_x)₂ compounds