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Large magnetocaloric effect induced by intrinsic structural transition in Dy1-x HoxMnO3

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7 Author(s)
Shao, Mingjie ; Department of Physics, Shanghai University, Shanghai 200444, China ; Cao, Shixun ; Yuan, Shujuan ; Shang, Jin
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We report the magnetic and magnetocaloric properties of Dy1-xHoxMnO3 (0 ≤ x ≤ 1). Large entropy change of 12.5 J/kg K and refrigeration capacity of 312 J/kg at 7 T for HoMnO3 is calculated based on isothermal magnetization measurements. The peak temperature of magnetic entropy change for all samples keeps the same 10.5 K, indicating that Ho3+ doping only affects the value of magnetic entropy. An unambiguous intrinsic structural transition near 7 K is first observed by strain measurement, which is believed as the origin of magnetic symmetry transition of Dy1-xHoxMnO3 and induces the magnetocaloric effect with the cooperation interaction between Dy3+/Ho3+and Mn3+ spins.

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Applied Physics Letters  (Volume:100 ,  Issue: 22 )