Giant reversible magnetocaloric effect in a multiferroic GdFeO3 single crystal
Giant reversible magnetocaloric effect in a multiferroic GdFeO3 single crystal
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DOI：
10.1103/physrevb.96.174405
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发表时间：
2017-11-06
影响因子：
3.7
通讯作者：
Mandal, P.
中科院分区：
文献类型：
--
作者：
Das, M.;Roy, S.;Mandal, P.
通过磁化强度和热容测量研究了GdFeO_3单晶在2-36 K温度范围内的磁热性质。对于0-9 T的场变化，观察到了显着大且可逆的磁熵变，Delta S-m = -52.5 J/kg K。绝热温度变化Δ T-ad也很大，为22 K，略高于Gd ~（3+）磁矩的反铁磁有序温度（T-N（Gd）= 2.5 K），场变化为0-8 T。这些磁热参数在测量的最低温度下仍然很大，并且在相同的温度范围内明显大于稀土（R）正铁氧体（RFeO 3）和几种潜在的磁制冷剂的其他成员。Δ S-m和Δ T-ad对于小的场变化也是相当大的。大的磁热参数值表明，GdFeO 3可以被认为是一种潜在的制冷剂在低温磁制冷技术，如在燃料工业中的氢液化。此外，GdFeO 3具有非常低的电导率，并且在磁化中没有表现出热滞后和场滞后，满足良好磁制冷剂的必要条件。
The magnetocaloric properties of single crystalline GdFeO3 have been investigated in the temperature range 2-36 K by magnetization and heat-capacity measurements. Remarkably large and reversible magnetic entropy change, Delta S-m = -52.5 J/kg K, has been observed for a field change of 0-9 T. The adiabatic temperature change, Delta T-ad, is also found to be very large, 22 K, slightly above the antiferromagnetic ordering temperature (T-N(Gd) = 2.5 K) of the Gd3+ moment, for a field change of 0-8 T. These magnetocaloric parameters remain large down to the lowest temperature measured and are significantly larger than that reported for the other members of rare-earth (R) orthoferrites (RFeO3) and several potential magnetic refrigerants in the same temperature range. Both Delta S-m and Delta T-ad are also quite large for a small field change. The large values of magnetocaloric parameters suggest that GdFeO3 could be considered as a potential refrigerant in low-temperature magnetic refrigeration technology, such as liquefaction of hydrogen in the fuel industry. Moreover, GdFeO3 has very low electrical conductivity and exhibits no thermal and field hysteresis in magnetization, fulfilling the necessary conditions for a good magnetic refrigerant.