Magnetothermal cooling with a phase separated manganite

Details Magnetothermal cooling with a phase separated manganite Magnetothermal cooling with a phase separated manganite

2009-12-01

arxiv.org/abs/0912.0296v1

Physics

Condensed Matter

Materials Science

16 pages, 4 figure

Scientific paper

We show that temperature of a current (I = 20 mA) carrying manganite (Nd0.5Ca0.5Mn0.93Ni0.07O3) in presence of a magnetic field (H) decreases abruptly as much as deltaT = 45 K (7 K) accompanied by a step like decrease in magnetoresistance at a critical value of H when the base temperature is 40 K (100 K). The magnitude of deltaT and the position of magnetoresistance step decrease towards lower H with decreasing amplitude of the current. We discuss possible origins of the current and magnetic- field driven temperature change which may find applications in magnetothermal refrigeration besides magnetocaloric effect.

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