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Tuneable magnetic phase transitions in layered CeMn2Ge2-xSix compounds

Journal Article


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Abstract


  • 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.

Authors


Publication Date


  • 2015

Citation


  • Md Din, M. F., Wang, J. L., Cheng, Z. X., Dou, S. X., Kennedy, S. J., Avdeev, M. & Campbell, S. J. (2015). Tuneable magnetic phase transitions in layered CeMn2Ge2-xSix compounds. Scientific Reports, 5 11288-1-11288-15.

Scopus Eid


  • 2-s2.0-84935005039

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2498&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1496

Start Page


  • 11288-1

End Page


  • 11288-15

Volume


  • 5

Abstract


  • 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.

Authors


Publication Date


  • 2015

Citation


  • Md Din, M. F., Wang, J. L., Cheng, Z. X., Dou, S. X., Kennedy, S. J., Avdeev, M. & Campbell, S. J. (2015). Tuneable magnetic phase transitions in layered CeMn2Ge2-xSix compounds. Scientific Reports, 5 11288-1-11288-15.

Scopus Eid


  • 2-s2.0-84935005039

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2498&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1496

Start Page


  • 11288-1

End Page


  • 11288-15

Volume


  • 5