☆ 4.4 Article

Magnetic and ESR studies in a Quasi-two-dimensional Triangular magnet Ba3MnNb2O9

SOLID STATE COMMUNICATIONS (2014)

Journal

SOLID STATE COMMUNICATIONS

Volume 191, Issue -, Pages 66-69

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

DOI: 10.1016/j.ssc.2014.04.020

Keywords

Antiferromagnetic; Electron spin resonance

Categories

Physics, Condensed Matter

Funding

National Natural Science Foundation of China [51002060, 11174092]
Program for New Century Excellent Talents in University [NCET-10-0413]

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Abstract

We report the magnetic, specific heat and electron spin resonance (ESR) studies on Ba3MnNb2O9, as one of quasi-two-dimensional triangular-lattice magnet. The magnetic susceptibility and specific heat measurement show that it undergoes an magnetic transition at T-N=3.2 K. The magnetic capacity (C-mag) follows T-2 dependence, and magnetic entropy (Smog) reaching to 14.5 J K(-1)mol(-1) at 32 K satisfactorily agrees with the theoretical estimations of Mn2+ ion in high-spin configuration with S=5/2. From the ESR spectra, the Lande factor (g(eff)), the linewidth (Delta H-pp) and the ESR intensity (1) are derived and analyzed as a function of temperature. As temperature decreases to 7*similar to 18 K, the g-factor shows a minima with g(eff)=1.984(2) before shifts to larger value at lower temperatures, and the ESR intensity starts to be suppressed below this temperature. This anomalous phenomenon is explained in terms of the establishment of short-range AFM spin correlations at much higher temperatures above T-N. (C) 2014 Elsevier Ltd. All rights reserved.

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