Abstract
MnPS3 intercalated with BEDT-TTF (ET) has been studied by Electron Spin Resonance (ESR) technique in the temperature range of 10–300K. A single and symmetric ESR peak was observed. The peak is much narrower than the expected from the paramagnetic Mn2+ ion. The ESR signal intensity, line width and effective g-value were observed to change dramatically at about 45 K, indicating a magnetic phase transition. That is, while the intensity is monotonically increased until a critical temperature Tc=45 K, both the line width and g-value remain almost constant above Tc. However, a very sharp decrease in ESR signal intensity, accompanied by line broadening below Tc, indicates a very strong spin frustration at lower temperatures. Some small and relatively smooth changes also occurred at about 30 K, 100 K and 170 K. However, below 30 K, the magnetization however starts to increase again and the line-width decreases with decreasing temperature. This points to the onset of a second transition toward ferromagnetic phase.
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