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EuRhAl4Si2, crystallizes in tetragonal crystal structure and ordersantiferromagnetically at ~12 K. The isothermal magnetization along the twoprinciple directions is highly anisotropic despite Eu2+ being an S-state ion.The variation of entropy change, which is a measure of MCE, with field andtemperature, calculated from the isothermal magnetization data taken at varioustemperatures along the principal crystallographic directions presentinteresting behavior in EuRhAl4Si2. In the magnetically ordered state theentropy change is non-monotonic below spin flip fields; however, in theparamagnetic region, it is negative irrespective of the strength of appliedmagnetic field. For H || [001] the maximum entropy change at 7 T is -21 J/Kg Karound TN, which is large and comparable to the largest known values in thistemperature range. The variation of the MCE with field strongly depends uponthe direction of the applied magnetic field. Magnetic phase diagram ofEuRhAl4Si2 derived from M(H) data is also constructed.

Magnetocaloric effect and magnetic phase diagram of EuRhAl4Si2