CAJ | 학술논문

最近的研究表明,在低温低场时,Gd_5Ge_4的一级磁结构相变被阻止而进入一种磁玻璃态,即在反铁磁母体中随机分布着铁磁团簇.结合这一最新研究结果,通过对Gd_5Ge_4样品不同低温的磁场诱导的磁化强度进行两次循环测量,研究发现在不同条件下Gd_5Ge_4的磁结构相变存在可逆性与不可逆性,并结合磁玻璃态进行了分析讨论.验证了Gd_5Ge_4的等温磁化行为和结构变化的一致性,这为证明在磁和晶格之间存在耦合作用提供了直接的实验证据,揭示了一级磁结构相变对巨磁热效应的产生起了重要作用.
최근적연구표명,재저온저장시,Gd_5Ge_4적일급자결구상변피조지이진입일충자파리태,즉재반철자모체중수궤분포착철자단족.결합저일최신연구결과,통과대Gd_5Ge_4양품불동저온적자장유도적자화강도진행량차순배측량,연구발현재불동조건하Gd_5Ge_4적자결구상변존재가역성여불가역성,병결합자파리태진행료분석토론.험증료Gd_5Ge_4적등온자화행위화결구변화적일치성,저위증명재자화정격지간존재우합작용제공료직접적실험증거,게시료일급자결구상변대거자열효응적산생기료중요작용.
Recent research have shown that the first order magnetic structural transition in Gd_5Ge_4 can be arrested at low temperatures and low magnetic fields.This effect gives rise to a low temperature magnetic glass state with ferromagnetic clusters embedded in antiferromagnetic matrix.Based on this new result,we have found that Gd_5Ge_4 undergoes reversible and irreversible magnetic structural phase transformations in different measuring conditions.It is shown that the magnetic behaviors are related to the structure transition.The first order magnetic structural phase transition plays an important role to the giant magnetocaloric effect.