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Enhanced magnetic refrigeration capacity in phase separated manganites
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Specific heat of polycrystalline (LPCMO) at 0 and 50 kOe. shifts substantially in a wide range. (b) -dependent magnetization for selected magnetic fields. Symbols refer to measurements taken upon warming after cooling in zero field. Solid lines refer to field cooling measurements. The inhomogeneous magnetic state is composed of coexisting FM and CO regions at magnetic fields below .

Image of FIG. 2.
FIG. 2.

(a) Isothermal entropy change (open circles, left scale) and the corresponding adiabatic temperature change (solid squares, right scale) extracted from heat capacity measurements. The and have a large magnitude over a wide range . (b) Magnetic phase diagram for LPCMO constructed from Fig. 1(b). Symbols correspond to peaks in , the lines are guides to the eyes. Magnetic phase separation occurs everywhere inside the shaded region (see text for details), though with varying amounts of FM volume fraction. The dashed lines represent phase transitions (e.g., glass transition , antiferromagnetism for 0 kOe) that do not play a role in the MCE observed in (a).

Image of FIG. 3.
FIG. 3.

at various fixed field ranges extracted from data [Fig. 1(b)] and (Fig. 2). The large, low temperature only occurs in the presence of phase separation between FM and CO regions.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced magnetic refrigeration capacity in phase separated manganites