Abstract
The magnetic entropy change () in a single crystal of the geometrically frustrated spin chain system has been determined under the influence of a wide range of temperatures and magnetic field variations. Our findings are consistent with the spin-density wave description of the zero field order, and with the suppression of the modulated state at low field. Metamagnetic transitions to the ferrimagnetic up-up-down configuration and full ferromagnetic alignment are observed upon the application of moderate magnetic fields in the direction. At low temperatures, an increase in supports the presence of short-range magnetic correlations coexisting with long-range order up to large fields. Depending on the temperature regime, local maxima or minima in can be found within the ferrimagnetic phase, which are identified with intermediate configurations among the chains. A new magnetic phase diagram has been constructed from the magnetic field and temperature dependence of magnetic entropy change.
- Received 17 January 2014
- Revised 26 March 2014
DOI:https://doi.org/10.1103/PhysRevB.89.144414
©2014 American Physical Society