Magnetocaloric effect in HoMnO3 crystal
Magnetocaloric effect in HoMnO3 crystal
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DOI：
10.1063/1.3386541
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发表时间：
2010-04-05
影响因子：
4
通讯作者：
Barman, S. Roy
中科院分区：
文献类型：
--
作者：
Midya, A.;Mandal, P.;Barman, S. Roy
我们研究了HoMnO_3单晶的磁学和磁热性质。由于Mn3+和Ho3+的长程有序，HoMnO3表现出一系列复杂的相变。在Ho3+的反铁磁有序温度附近，磁化强度的场变化产生了变磁相变，并在7T时产生了13.1J/kgK的熵变。磁场变化7T时的绝热温变(约6.5K)和相对制冷功率(约320J/kg)也可作为低温下的磁致冷剂。
We have investigated the magnetic and magnetocaloric properties of HoMnO3 single crystal. HoMnO3 displays a series of complicated phase transitions due to the long range ordering of Mn3+ and Ho3+ moments. Field variation in magnetization generates a metamagnetic transition and produces an entropy change of 13.1 J/kg K at 7 T in the vicinity of antiferromagnetic ordering temperature of Ho3+. The values of adiabatic temperature change (similar to 6.5 K) and relative cooling power (similar to 320 J/kg) for a field change of 7 T are also appreciable to consider HoMnO3 as a magnetic refrigerant at low temperature.