Tunable magnetocaloric effect in RTi MoGe (R= Tb, Er) (x=0, 0.15) compoundsR. Nirmala1 and S. K. Malik2
1 Tata Institute of Fundamental Research - Mumbai 400-005, India
2 International Centre for Condensed Matter Physics - ICCMP, University of Brasilia - Brasilia, Brazil
received 9 July 2007; accepted in final form 22 August 2007; published October 2007
published online 13 September 2007
The tetragonal layered compounds TbTiGe and ErTiGe order antiferromagnetically at 276 K and 39 K, respectively. Partial substitution of Mo for Ti in these two compounds modifies the magnetic interactions giving rise to a ferromagnetic ground state which results in an enhanced magnetocaloric effect. The magnetic entropy change in for a magnetic field change of 5 T is as against for ErTiGe in the vicinity of the magnetic transition. Thus, magnetocaloric properties of such layered materials may be tunable by suitable chemical substitutions.
75.30.Sg - Magnetocaloric effect, magnetic cooling.
75.50.Cc - Other ferromagnetic metals and alloys.
75.47.-m - Magnetotransport phenomena; materials for magnetotransport.
© Europhysics Letters Association 2007