Abstrakt
KTm(MoO4)(2) belongs to the family of binary alkaline rare-earth molybdates. This compound can be considered to be an almost ideal quantum two-level system at low temperatures.
Magnetocaloric properties of KTm(MoO4)(2) single crystals were investigated using specific heat and magnetization measurement in the magnetic field applied along the easy axis. Large conventional magnetocaloric effect (-Delta S-M approximate to 10.3 J/(kg K)) was observed in the magnetic field of 5 T in a relatively wide temperature interval.
The isothermal magnetic entropy change of about 8 J/(kgK) has been achieved already for the magnetic field of 2 T. Temperature dependence of the isothermal entropy change under different magnetic fields is in good agreement with theoretical predictions for a quantum two-level system with Delta approximate to 2.82 cm(-1).
Investigation of magnetocaloric properties of KTm(MoO4)(2) suggests that the studied system can be considered as a good material for magnetic cooling at low temperatures.