Volume 124, Number 2, October 2018
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||14 November 2018|
Nonmagnetic impurity effect on magnetic correlation in the triangular-lattice antiferromagnet Ba3Mn1−xZnxSb2O9(0 < x < 0.16)
1 School of Physics & Electronic Engineering, Zhengzhou University of Light Industry - Zhengzhou, 450002, PRC
2 School of Physics and Wuhan National Pulsed High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, PRC
3 High Magnetic Field Laboratory, Chinese Academy of Science - Hefei 230031, PRC
4 School of Physics, Wuhan University - Wuhan 430072, PRC
Received: 18 April 2018
Accepted: 16 October 2018
The nonmagnetic impurity effects on the triangular-lattice antiferromagnet (TLAF) Ba3Mn1−xZnxSb2O9 () by Zn2+ () dilutions are investigated based on magnetic susceptibility, specific heat and electron spin resonance (ESR) measurements. The ac susceptibility and specific heat result reveal that the two-dimensional (2D) antiferromagnetic (AFM) ground state is stable rather than forming a spin-glass (SG) phase for Zn2+ substitution up to , where the AFM transition temperature (TN) shifts slowly from 10.2 K () to 8.2 K (). For all samples, the divergence of the temperature-dependent linewidth of ESR can be well described in terms of the Berezinskii-Kosterlitz-Thouless (BKT) scenario. The evolution of ESR spectra suggests that the nonmagnetic impurity does not induce magnetic defects decoupled with AFM matrix but rather change the bulk AFM properties.
PACS: 76.30.-v – Electron paramagnetic resonance and relaxation / 75.50.Ee – Antiferromagnetics
© EPLA, 2018
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