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Giant magnetocaloric effect and short-range ordering of magnetic refrigerant materials R$$_5$$Pd$$_2$$(R=Tb, Ho)

Kitazawa, Hideaki*; Kawamura, Yukihiko*; Keller, L.*; Toyoizumi, Saori*; Terada, Noriki*; Suzuki, Hiroyuki*; Mamiya, Hiroaki*; Doenni, A.*; Lee, S.*; Metoki, Naoto  ; Kaneko, Koji  ; Igawa, Naoki ; Tamaki, Akira*

Neutron Scattering study has been carried out in order to reveal the magnetic structure of the antiferromagnet Ho$$_5$$Pd$$_2$$, which shows giant magnetocaloric effect. We observed short rage magnetic order at k=0.18, 0.18, 0.18 above the antiferromagnetic transition temperature $$T$$$$_N$$. Tb$$_5$$Pd$$_2$$ also showed magnetic short range correlation above the temperature higher than 2$$times$$$$T$$$$_N$$.

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