Negative magnetocaloric effect from highly sensitive metamagnetism in CoMnSi1-xGex

[摘要] We report a negative magnetocaloric effect in CoMnSi1-xGex arising from a metamagnetic magnetoelastic transition. The effect is of relevance to magnetic refrigeration over a wide range of temperature, including room temperature. In addition we report a very high shift in the metamagnetic transition temperature with applied magnetic field. This is driven by competition between antiferromagnetic and ferromagnetic order which can be readily tuned by applied pressure and compositional changes.

[发布日期] 2006-12-01

[关键词] MAGNETIC-PROPERTIES;ENTROPY CHANGE;TEMPERATURE;TRANSITION;PRESSURE;ALLOYS;SYSTEM