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Neutron diffraction study of rare-earth compound Ho$$_5$$Pd$$_2$$ with a large magnetocaloric effect

巨大磁気熱効果を示す希土類化合物Ho$$_5$$Pd$$_2$$の中性子回折による研究

北澤 英明*; 河村 幸彦*; 寺田 典樹*; 間宮 広明*; 鈴木 博之*; Doenni, A.*; 金子 耕士  ; 目時 直人  ; 井川 直樹 

Kitazawa, Hideaki*; Kawamura, Yukihiko*; Terada, Noriki*; Mamiya, Hiroaki*; Suzuki, Hiroyuki*; Doenni, A.*; Kaneko, Koji; Metoki, Naoto; Igawa, Naoki

多結晶Ho$$_5$$Pd$$_2$$の中性子回折実験をJRR-3にて行った。100K以下で、k=(0.18, 0.18, 0.18)の秩序ベクトルを伴う磁気ピークを観察した。ピーク線幅は最低温度5Kでも非常に広く、この物質は低温で長波長のモジュレーションを伴った短距離秩序が生じることが明らかとなった。

We have performed neutron powder diffraction experiments at JRR-3 using polycrystalline Ho$$_5$$Pd$$_2$$. The magnetic peaks with a propagation vector k = (0.18, 0.18, 0.18) are gradually developing below about 100 K. The peak width is significantly broader than an experimental resolution even temperature is 5 K. These results indicate that Ho$$_5$$Pd$$_2$$ is a short-range ordered antiferromagnet with a long wave length.

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