Tuneable Magnetic Phase Transitions in Layered CeMn2Ge2-xSix Compounds

被引：38

作者：

Din, M. F. Md ^{[1
,4
]}

Wang, J. L. ^{[1
,2
]}

Cheng, Z. X. ^{[1
]}

Dou, S. X. ^{[1
]}

Kennedy, S. J. ^{[2
]}

Avdeev, M. ^{[2
]}

Campbell, S. J. ^{[3
]}

机构：

[1] Univ Wollongong, Inst Superconduct & Elect Mat, Wollongong, NSW 2522, Australia

[2] Australian Nucl Sci & Technol Org, Bragg Inst, Lucas Heights, NSW 2234, Australia

[3] Univ New S Wales, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia

[4] Natl Def Univ Malaysia, Fac Engn, Dept Elect & Elect Engn, Kuala Lumpur 57000, Malaysia

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

澳大利亚研究理事会;

关键词：

DOMINANT ANTIFERROMAGNETIC COMPONENTS; NEUTRON-DIFFRACTION; ENTROPY CHANGE; MN; BEHAVIOR; RMN2GE2; X=0.4; HO;

D O I：

10.1038/srep11288

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The structural and magnetic properties of seven CeMn2Ge2-xSix compounds with x = 0.0-2.0 have been investigated in detail. Substitution of Ge with Si leads to a monotonic decrease of both a and c along with concomitant contraction of the unit cell volume and significant modifications of the magnetic states - a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The magnetic phase diagram has been constructed over the full range of CeMn2Ge2-xSix compositions and co-existence of ferromagnetism and antiferromagnetism has been observed in CeMn2Ge1.2Si0.8, CeMn2Ge1.0Si1.0 and CeMn2Ge0.8Si1.2 with novel insight provided by high resolution neutron and X-ray synchrotron radiation studies. CeMn2Ge2-xSix compounds (x = 0, 0.4 and 0.8) exhibit moderate isothermal magnetic entropy accompanied with a second-order phase transition around room temperature. Analysis of critical behaviour in the vicinity of T-C(inter) for CeMn2Ge2 compound indicates behaviour consistent with three-dimensional Heisenberg model predictions.

引用

页数：15

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