Abstract
Nanostructured TaS2 with different concentrations of intercalated Mn ions has been investigated using ac and dc magnetization measurements. The nanostructures are composed of tapes that are less than a micron wide, which themselves are comprised of tubular structures with an average diameter of about 100nm. The sample with a concentration x=0.15 of Mn exhibited a transition from paramagnetism to a cluster glass state at approximately 8K. The dynamics of this cluster glass state was better described by the Vogel–Fulcher–Tammann law than by critical slowing down, which suggests that the transition is not a continuous one. The cluster glass state exhibited aging-related memory, which is typically observed in canonical spin glasses and superspin glasses. The sample with x=0.23 underwent a paramagnetic to ferromagnetic transition at 85K. Nonlinear susceptibility measurements suggest that there is another transition close to but somewhat lower than 85K. With a small measuring field, both zero-field-cooled and field-cooled magnetizations exhibit peaks and dramatic downturns at low temperatures. The field-cooled magnetization also exhibits temperature hysteresis. The unusual behavior of the field-cooled magnetization is due to relaxation and cooling-rate effects. The overall behavior of nanostructured MnxTaS2 possesses the hallmarks of competition between clustered magnetic ground states in a disordered magnetic system.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call