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Osakabe, Toyotaka; Kato, Yoshihiro*; Honmoto, Satoru*; Kuwahara, Keitaro*
Koatsuryoku No Kagaku To Gijutsu, 25(1), p.57 - 63, 2015/03
In this article, we describe an unique technique for electrical insulation of metallic gasket to perform simultaneous measurements of electrical resistivity and neutron diffraction under high pressure. The anodic oxide coating was adopted as the insulation layer of the aluminum (JIS A2017) gasket used in the hybrid-anvil device for neutron diffraction. In the feasibility tests of the coated gaskets, maximum pressure of about 6 GPa was generated without electrical breakdown of the coating or disconnection of Au leads.
Osakabe, Toyotaka; Kato, Yoshihiro*; Honmoto, Satoru*; Kuwahara, Keitaro*
no journal, ,
no abstracts in English
Osakabe, Toyotaka; Honmoto, Satoru*; Kato, Yoshihiro*; Kuwahara, Keitaro*
no journal, ,
no abstracts in English
Osakabe, Toyotaka; Honmoto, Satoru*; Kuwahara, Keitaro*
no journal, ,
no abstracts in English
P
under low temperature and high pressureHonmoto, Satoru*; Osakabe, Toyotaka; Kuwahara, Keitaro*
no journal, ,
We have carried out high-pressure neutron magnetic diffraction experiments and high-pressure transport measurements on filled skutterudite compound PrFeP under identical pressurization conditions up to 5.5 GPa. This compound shows metal-to-insulator transition at 2.4 GPa and simultaneously antiferromagnetic transition. At first, the metal-to-insulator transition is thought to be a kind of Slater transition accompanied by the antiferromagnetic transition. According to the analysis of resistivity data, we, however, found the insulator state arose from the hybridization between f-electrons of Pr ions and conduction electrons. Furthermore, the hybridization gap grows up to about 4 GPa and in reversal shrinks with increasing pressure. On the other hand, the pressure dependence of the antiferromagnetic transition temperature appears to show negative correlation to that of the gap. We can not interpret the behavior microscopically at present, but, predict that this is closely related to the Fermi surface instability of this compound.
Osakabe, Toyotaka; Kuwahara, Keitaro*; Honmoto, Satoru*; Kato, Yoshihiro*
no journal, ,
no abstracts in English
