Volume 115, Number 6, September 2016
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 November 2016|
Spin-dimensionality change induced by Co-doping in the chiral magnet Fe1−xCoxSi
1 High Magnetic Field Laboratory, Chinese Academy of Sciences - Hefei 230031, China
2 Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig D-38106 Braunschweig, Germany
3 University of Science and Technology of China - Hefei 230026, China
4 Department of Applied Physics, Nanjing University of Aeronautics and Astronautics Nanjing 210016, China
5 Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China - Hefei 230026, China
Received: 13 June 2016
Accepted: 17 October 2016
Dimensionality is one of the most important parameters in the determination of the physical properties. Therefore, tuning of effective dimensionality is of significant importance for modulating the functionality of materials. In this work, we find that the spin-dimensionality can be changed by Co-doping in the Fe1−xCoxSi system. Investigation of the critical behavior shows that the effective critical exponents for x = 0.3 agree with the three-dimensional (3D) Heisenberg model with (d is the spatial-dimensionality, and n is the spin-dimensionality). With the increase of Co-content, the effective critical exponents for x = 0.5 fulfill the 3D-XY model with , while those for x = 0.6 approach the 3D-Ising model with . These results indicate the lowering of the spin-dimensionality with the increase of Co-content in Fe1−xCoxSi. We suggest that the modulation of the spin-dimensionality in Fe1−xCoxSi should result from the enhancement of the anisotropic magnetic interaction induced by the doping of Co.
PACS: 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.40.-s – Critical-point effects, specific heats, short-range order
© EPLA, 2016
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