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Tuning the magnetic and structural transitions in TbCo2Mnx compounds

Journal Article


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Abstract


  • The wide ranging magnetic behavior in intermetallic compounds continues to attract broad interest. Effective

    control of their magnetic properties is of great importance for fundamental research and potential applications.

    In this work the structural and magnetic properties of TbCo2Mnx compounds are studied by a combination of

    temperature dependent synchrotron x-ray diffraction, neutron powder diffraction, specific heat, and magnetic

    measurements. Magnetization measurements show that the addition of Mn can modify the magnetic behavior

    significantly: first, the magnetic transition temperatures increase from ∼227 K to 332 K with x = 0.0 to 0.3;

    secondly, the nature of the magnetic transitions change from the first order to second order, as identified by three

    methods (Banerjee criterion, master curves of magnetic entropy changes, and detailed crystal structure analysis

    through neutron diffraction). Both synchrotron x-ray diffraction and neutron diffraction confirm that a structural

    transition, from cubic Fd3¯m to rhombohedral R3¯m on cooling, occurred accompanying the magnetic transition.

    To further clarify the nature of the second order magnetic phase transitions, we have carried out a detailed critical

    exponent analysis. The derived critical exponents are close to the theoretical prediction from the mean-field model,

    indicating the magnetic interactions are long range. This work benefits our general understanding of magnetic

    interactions in intermetallic compounds and provides guidance to design a functional magnetic material for room

    temperature magnetic devices.

Authors


  •   Fang, Chunsheng (external author)
  •   Wang, Jian Li.
  •   Hong, Fang (external author)
  •   Hutchison, Wayne D. (external author)
  •   Md Din, M F. (external author)
  •   Studer, Andrew J. (external author)
  •   Kimpton, Justin A. (external author)
  •   Dou, Shi Xue
  •   Cheng, Zhenxiang

Publication Date


  • 2017

Citation


  • Fang, C., Wang, J., Hong, F., Hutchison, W. D., Din, M., Studer, A. J., Kimpton, J. A., Dou, S. & Cheng, Z. (2017). Tuning the magnetic and structural transitions in TbCo2Mnx compounds. Physical Review B: Covering condensed matter and materials physics, 96 (6), 064425-1-064425-11.

Scopus Eid


  • 2-s2.0-85028761305

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3760&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2710

Start Page


  • 064425-1

End Page


  • 064425-11

Volume


  • 96

Issue


  • 6

Place Of Publication


  • United States

Abstract


  • The wide ranging magnetic behavior in intermetallic compounds continues to attract broad interest. Effective

    control of their magnetic properties is of great importance for fundamental research and potential applications.

    In this work the structural and magnetic properties of TbCo2Mnx compounds are studied by a combination of

    temperature dependent synchrotron x-ray diffraction, neutron powder diffraction, specific heat, and magnetic

    measurements. Magnetization measurements show that the addition of Mn can modify the magnetic behavior

    significantly: first, the magnetic transition temperatures increase from ∼227 K to 332 K with x = 0.0 to 0.3;

    secondly, the nature of the magnetic transitions change from the first order to second order, as identified by three

    methods (Banerjee criterion, master curves of magnetic entropy changes, and detailed crystal structure analysis

    through neutron diffraction). Both synchrotron x-ray diffraction and neutron diffraction confirm that a structural

    transition, from cubic Fd3¯m to rhombohedral R3¯m on cooling, occurred accompanying the magnetic transition.

    To further clarify the nature of the second order magnetic phase transitions, we have carried out a detailed critical

    exponent analysis. The derived critical exponents are close to the theoretical prediction from the mean-field model,

    indicating the magnetic interactions are long range. This work benefits our general understanding of magnetic

    interactions in intermetallic compounds and provides guidance to design a functional magnetic material for room

    temperature magnetic devices.

Authors


  •   Fang, Chunsheng (external author)
  •   Wang, Jian Li.
  •   Hong, Fang (external author)
  •   Hutchison, Wayne D. (external author)
  •   Md Din, M F. (external author)
  •   Studer, Andrew J. (external author)
  •   Kimpton, Justin A. (external author)
  •   Dou, Shi Xue
  •   Cheng, Zhenxiang

Publication Date


  • 2017

Citation


  • Fang, C., Wang, J., Hong, F., Hutchison, W. D., Din, M., Studer, A. J., Kimpton, J. A., Dou, S. & Cheng, Z. (2017). Tuning the magnetic and structural transitions in TbCo2Mnx compounds. Physical Review B: Covering condensed matter and materials physics, 96 (6), 064425-1-064425-11.

Scopus Eid


  • 2-s2.0-85028761305

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3760&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2710

Start Page


  • 064425-1

End Page


  • 064425-11

Volume


  • 96

Issue


  • 6

Place Of Publication


  • United States