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Journal of Applied Physics / Volume 111 / Issue 1 / ARTICLES / Magnetism and Superconductivity

J. Appl. Phys. 111, 013913 (2012); http://dx.doi.org/10.1063/1.3674323 (6 pages)

Reentrant spin-glass behavior induced by the frustration of Fe-Fe interactions in Laves phase Nb1−xHfxFe2 alloys

Tian Gao1,2, Katsuhiko Nishimura2, Takahiro Namiki2, and Hiroshi Okimoto2

1Department of Physics, Shanghai University of Electric Power, Shanghai 201300, People’s Republic of China
2Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan

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(Received 25 August 2011; accepted 3 December 2011; published online 6 January 2012)

We carried out magnetization and specific-heat measurements of metallic compounds Nb1−xHfxFe2 (x = 0 and 0.65), which exhibit reentrant spin-glass freezing. The frequency dependence of ac susceptibility and the bifurcation between zero-field-cooled and field-cooled magnetization curves suggest the complex coexistence of magnetic phases at low temperatures. A long-time relaxation of magnetization is possibly due to the cluster-type and traditional reentrant spin-glass transition, which may be induced by the frustration of long-range Fe-Fe interactions. We did not observe any discontinuity indicating long-range magnetic phase transition in the data of specific heat versus temperature, but a broad hump characteristic of spin-glass freezing. The difference between the behaviors of two samples proves the existence of two types of reentrant spin-glass in alloys. The moment arrangements are briefly discussed.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL DETAILS
  3. RESULTS AND DISCUSSION
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

freezing, frustration, hafnium alloys, iron alloys, magnetic moments, magnetic relaxation, magnetic structure, magnetic susceptibility, magnetic transitions, magnetisation, niobium alloys, phase separation, specific heat

PACS

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 65.40.Ba

    Heat capacity

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

  • 75.30.Cr

    Saturation moments and magnetic susceptibilities

  • 64.75.Op

    Phase separation and segregation in alloying

  • 75.25.-j

    Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3674323

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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