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Volume dependence of the magnetic coupling in LaFe13−xSix based compounds

Appl. Phys. Lett. 92, 101904 (2008); doi:10.1063/1.2894194

Published 10 March 2008

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L. Jia,1 J. R. Sun,1 F. W. Wang,1 T. Y. Zhao,1 H. W. Zhang,1 B. G. Shen,1 D. X. Li,2 S. Nimori,3 Y. Ren,4 and Q. S. Zeng5,6
1Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
2Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313 Japan
3Tsukuba Magnet Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba, 305-0003 Japan
4X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
5Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
6HPSynC-Geophysical Laboratory, Carnegie Institution of Washington, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
The effects of pressure and hydrogenation, the former causes a lattice contraction while the latter causes an expansion of the sample, have been systematically studied for LaFe13−xSix (x=1.3–2.1). It is found that the typical change of the Curie temperature is ~150  K when ~1.6  H/f.u. is absorbed and ~−106  K as the pressure sweeps from 0  to  1  GPa. One of the most remarkable results of the present work is the presence of a universal relation between Curie temperature and phase volume. The former linearly grows with the increase of lattice constant (~1510  K/Å), irrespective of how the phase volume is modified. This result implies the exclusive dependence of the magnetic coupling in LaFe13−xSix on the Fe–Fe distances and the interstitial hydrogen does not affect the electronic structure of the compounds. ©2008 American Institute of Physics
History: Received 13 December 2007; accepted 18 February 2008; published 10 March 2008
Permalink: http://link.aip.org/link/?APPLAB/92/101904/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.30.Kz
    Magnetic phase boundaries
  • 61.72.jj
    Interstitials
  • 61.66.Dk
    Crystal structure of specific alloys
  • 71.20.Gj
    Electronic structure of other crystalline metals and alloys
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (9)
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