Large displacement of germanium atoms in crystalline Ge2 Sb2 Te5

S. Shamoto; N. Yamada; T. Matsunaga; Th Proffen; J. W. Richardson; J. H. Chung; T. Egami

doi:10.1063/1.1861976

Large displacement of germanium atoms in crystalline Ge2 Sb2 Te5

S. Shamoto
, N. Yamada
, T. Matsunaga
, Th Proffen
, J. W. Richardson
, J. H. Chung
, T. Egami

Department of Physics

Research output: Contribution to journal › Article › peer-review

60 Citations (Scopus)

Abstract

Local structure of NaCl-type crystalline Ge2 Sb2 Te5 has been studied by the atomic pair distribution function analysis of pulsed neutron powder diffraction data. We have found the large displacement of germanium atoms in this crystalline phase. Usually, such a large lattice distortion has disadvantages for the electric conductivity. The electronic band structure, however, implies that this significant distortion in addition to the lattice defect at Na site reduces only thermal conductivity, while the highly ordered tellurium atoms at Cl site keep high electric conductivity.

Original language	English
Article number	081904
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	8
DOIs	https://doi.org/10.1063/1.1861976
Publication status	Published - 2005 Feb 21

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1861976

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@article{0452c6ca4a464fd2a833703094887a88,

title = "Large displacement of germanium atoms in crystalline Ge2 Sb2 Te5",

abstract = "Local structure of NaCl-type crystalline Ge2 Sb2 Te5 has been studied by the atomic pair distribution function analysis of pulsed neutron powder diffraction data. We have found the large displacement of germanium atoms in this crystalline phase. Usually, such a large lattice distortion has disadvantages for the electric conductivity. The electronic band structure, however, implies that this significant distortion in addition to the lattice defect at Na site reduces only thermal conductivity, while the highly ordered tellurium atoms at Cl site keep high electric conductivity.",

author = "S. Shamoto and N. Yamada and T. Matsunaga and Th Proffen and Richardson, \{J. W.\} and Chung, \{J. H.\} and T. Egami",

note = "Funding Information: The authors thank Professor T. Kajitani for his encouragement, E. Maxy, Dr. J. Nakamura, and K. Kawahara for their help, and Professor Y. Kameda for fruitful discussion. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan. This work has benefited from the use of NPDF at the Lujan Center at Los Alamos Neutron Science Center, Los Alamos National Laboratory and Argonne National Laboratory are funded by DOE under Contract No. W-7405-ENG-36 and W-31-109-ENG-38, respectively. The upgrade of NPDF has been funded by NSF through Grant No. DMR 00-76488.",

year = "2005",

month = feb,

day = "21",

doi = "10.1063/1.1861976",

language = "English",

volume = "86",

pages = "1--3",

journal = "Applied Physics Letters",

issn = "0003-6951",

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TY - JOUR

T1 - Large displacement of germanium atoms in crystalline Ge2 Sb2 Te5

AU - Shamoto, S.

AU - Yamada, N.

AU - Matsunaga, T.

AU - Proffen, Th

AU - Richardson, J. W.

AU - Chung, J. H.

AU - Egami, T.

N1 - Funding Information: The authors thank Professor T. Kajitani for his encouragement, E. Maxy, Dr. J. Nakamura, and K. Kawahara for their help, and Professor Y. Kameda for fruitful discussion. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan. This work has benefited from the use of NPDF at the Lujan Center at Los Alamos Neutron Science Center, Los Alamos National Laboratory and Argonne National Laboratory are funded by DOE under Contract No. W-7405-ENG-36 and W-31-109-ENG-38, respectively. The upgrade of NPDF has been funded by NSF through Grant No. DMR 00-76488.

PY - 2005/2/21

Y1 - 2005/2/21

N2 - Local structure of NaCl-type crystalline Ge2 Sb2 Te5 has been studied by the atomic pair distribution function analysis of pulsed neutron powder diffraction data. We have found the large displacement of germanium atoms in this crystalline phase. Usually, such a large lattice distortion has disadvantages for the electric conductivity. The electronic band structure, however, implies that this significant distortion in addition to the lattice defect at Na site reduces only thermal conductivity, while the highly ordered tellurium atoms at Cl site keep high electric conductivity.

AB - Local structure of NaCl-type crystalline Ge2 Sb2 Te5 has been studied by the atomic pair distribution function analysis of pulsed neutron powder diffraction data. We have found the large displacement of germanium atoms in this crystalline phase. Usually, such a large lattice distortion has disadvantages for the electric conductivity. The electronic band structure, however, implies that this significant distortion in addition to the lattice defect at Na site reduces only thermal conductivity, while the highly ordered tellurium atoms at Cl site keep high electric conductivity.

UR - https://www.scopus.com/pages/publications/17044377602

UR - https://www.scopus.com/pages/publications/17044377602#tab=citedBy

U2 - 10.1063/1.1861976

DO - 10.1063/1.1861976

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AN - SCOPUS:17044377602

SN - 0003-6951

VL - 86

SP - 1

EP - 3

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 8

M1 - 081904

ER -

Large displacement of germanium atoms in crystalline Ge2 Sb2 Te5

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