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Journal Articles

Structural basis for the fast phase change of Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$; Ring statistics analogy between the crystal and amorphous states

Kohara, Shinji*; Kato, Kenichi*; Kimura, Shigeru*; Tanaka, Hitoshi*; Usuki, Takeshi*; Suzuya, Kentaro; Tanaka, Hiroshi*; Moritomo, Yutaka*; Matsunaga, Toshiyuki*; Yamada, Noboru*; et al.

Applied Physics Letters, 89(20), p.201910_1 - 201910_3, 2006/11

 Times Cited Count:183 Percentile:97.85(Physics, Applied)

The three-dimensional atomic configuration of amorphous Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ were derived by reverse Monte Carlo simulation with synchrotron-radiation X-ray diffraction data. The authors found that amorphous Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ can be regarded as "even-numbered ring structure", because the ring statistics is dominated by four- and six-fold rings analogous to the crystal phase. On the other hand, the formation of Ge-Ge homopolar bonds in amorphous GeTe constructs both odd- and even-numbered rings. They believe that the unusual ring statistics of amorphous Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ is the key for the fast crystallization speed of the material.

Journal Articles

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

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

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

 Times Cited Count:32 Percentile:79.32(Materials Science, Multidisciplinary)

We have studied crystal structure, magnetism and electric transport properties of a europium fulleride Eu$$_6$$C$$_{60}$$ and its Sr-substituted compounds, Eu$$_{6-x}$$Sr$$_x$$C$$_{60}$$. They have a $$bcc$$ structure, which is an isostructure of other $$M_6$$C$$_{60}$$ ($$M$$ represents an alkali atom or an alkaline earth atom). Magnetic measurements revealed that magnetic moment is ascribed to the divalent europium atom with $$S$$ = 7/2 spin, and a ferromagnetic transition was observed at $$T_C$$ = 10 - 14 K. In Eu$$_6$$C$$_{60}$$, we also confirm the ferromagnetic transition by heat capacity measurement. The striking feature in Eu$$_{6-x}$$Sr$$_x$$C$$_{60}$$ is very large negative magnetoresistance at low temperature; the resistivity ratio $$rho$$($$H$$ = 9 T)/$$rho$$($$H$$ = 0 T) reaches almost 10$$^{-3}$$ at 1 K in Eu$$_6$$C$$_{60}$$. Such large magnetoresistance is the manifestation of a strong $$pi$$-$$f$$ interaction between conduction carriers on C$$_{60}$$ and 4$$f$$ electrons of Eu.

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