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Journal Articles

Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO

Kim, J.*; Fujiwara, Akihiko*; Sawada, Tomohiro*; Kim, Y.*; Sugimoto, Kunihisa*; Kato, Kenichi*; Tanaka, Hiroshi*; Ishikado, Motoyuki*; Shamoto, Shinichi; Takata, Masaki*

IUCrJ, 1(3), p.155 - 159, 2014/05

https://doi.org/10.1107/S2052252514005636

Times Cited Count：2 Percentile：21.44(Chemistry, Multidisciplinary)

Using a charge density analysis based on synchrotron radiation X-ray powder diffraction data, we found that the charge carriers only accumulated in the iron layer of the superconducting phase of LaFeAsO $_{1-x}$ F $_{x}$ at low temperatures. Analysis of the electrostatic potential distribution revealed the concerted enhancement of the electronic polarization of the As ions and the carrier redistribution.

Journal Articles

Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu $_{6-x}$ SrC $_{60}$

Ishii, Kenji; Fujiwara, Akihiko*; Suematsu, Hiroyoshi*; Kubozono, Yoshihiro*

Physical Review B, 65(13), p.134431_1 - 134431_6, 2002/03

https://doi.org/10.1103/PhysRevB.65.134431

Times Cited Count：32 Percentile：78.13(Materials Science, Multidisciplinary)

We have studied crystal structure, magnetism and electric transport properties of a europium fulleride EuC $_{60}$ and its Sr-substituted compounds, Eu $_{6-x}$ SrC $_{60}$ . They have a structure, which is an isostructure of other C $_{60}$ ( represents an alkali atom or an alkaline earth atom). Magnetic measurements revealed that magnetic moment is ascribed to the divalent europium atom with = 7/2 spin, and a ferromagnetic transition was observed at = 10 - 14 K. In EuC $_{60}$ , we also confirm the ferromagnetic transition by heat capacity measurement. The striking feature in Eu $_{6-x}$ SrC $_{60}$ is very large negative magnetoresistance at low temperature; the resistivity ratio ( = 9 T)/( = 0 T) reaches almost 10 $^{-3}$ at 1 K in EuC $_{60}$ . Such large magnetoresistance is the manifestation of a strong - interaction between conduction carriers on C $_{60}$ and 4 electrons of Eu.