X-ray diffraction and photoelectron spectroscopy of different Co-doped concentration GeTe have been made to identify the vacancies in rock-salt GeTe. The results show that Co occupies germanium vacancy and forms Co–Te bond, but the alloy retains a rock-salt structure when the concentration of doped Co is less than the vacancy ratio in crystalline GeTe. If we construct 8% germanium vacancy and relative distortion in rock-salt GeTe, the magnetism calculation based on spin-polarized density functional theory of Co-doped GeTe agrees well with superconducting quantum interference device magnetometer result. From experiment and calculation results, we can confirm the existence of vacancies in rock-salt GeTe and the ratio is 8%.
REFERENCES
1.
M.
Wuttig
and N.
Yamada
, Nature Mater.
6
, 824
(2007
).2.
W. J.
Wang
, R.
Zhao
, L. P.
Shi
, X. S.
Miao
, P. K.
Tan
, M. H.
Hong
, T. C.
Chong
, Y. H.
Wu
, and Y.
Lin
, J. Appl. Phys.
98
, 124313
(2005
).3.
R.
Ovshinsky
, Phys. Rev. Lett.
21
, 1450
(1968
).4.
G.
Bruns
, P.
Merkelbach
, C.
Schlockermann
, M.
Saling
, M.
Wuttig
, T. D.
Happ
, J. B.
Philipp
, and M.
Kund
, Appl. Phys. Lett.
95
, 043108
(2009
).5.
M.
Wuttig
, D.
Lusebrink
, D.
Wamwangi
, W.
Welnic
, M.
Gilleben
, and R.
Dronskowski
, Nature Mater.
6
, 122
(2007
).6.
A. V.
Kolobov
, J.
Haines
, A.
Pradel
, M.
Ribes
, P.
Fons
, J.
Tominaga
, C.
Stermer
, G.
Aquilanti
, and S.
Pascarelli
, Appl. Phys. Lett.
91
, 021911
2007
).7.
J. L. F.
Da Silva
, A.
Walsh
, S. -H.
Wei
, and H.
Lee
, J. Appl. Phys.
106
, 113509
(2009
).8.
A. V.
Kolobov
, J.
Tominaga
, P.
Fons
, and T.
Uruga
, Appl. Phys. Lett.
82
, 382
(2003
).9.
J.
Akola
and R. O.
Jones
, Phys. Rev. B
76
, 235201
(2007
).10.
JCPDS-ICCD Powder Diffraction Pattern File (PDF-2) Card No. 65-0415.
11.
D. H.
Kim
, J. S.
Yang
, K. W.
Lee
, S. D.
Bu
, and T. W.
Noh
, Appl. Phys. Lett.
81
, 2421
(2002
).12.
M. C.
Jung
, H. J.
Shin
, K.
Kim
, J. S.
Noh
, and J.
Chung
, Appl. Phys. Lett.
89
, 043503
(2006
).13.
L. V.
Yashina
, R.
Puttner
, V. S.
Neudachina
, T. S.
Zyubina
, V. I.
Shtanov
, and M. V.
Poygin
, J. Appl. Phys.
103
, 094909
(2008
).14.
B. J.
Tufts
, I. L.
Abrahams
, C. E.
Caley
, S. R.
Lunt
, G. M.
Miskelly
, M. J.
Sailor
, P. G.
Santangelo
, N. S.
Lewis
, A. L.
Roe
, and K. O.
Hodgson
, J. Am. Chem. Soc.
112
, 5123
(1990
).15.
Z.
Zsoldos
and L.
Guczl
, J. Phys. Chem.
96
, 9393
(1992
).16.
L.
Ji
, J.
Lin
, and H. C.
Zeng
, J. Phys. Chem. B
104
, 1783
(2000
).17.
Y.
Zhang
, H.
Xiong
, K.
Liew
, and J.
Li
, J. Mol. Catal. A: Chem.
237
, 172
(2005
).18.
JCPDS-ICCD Powder Diffraction Pattern File (PDF-2) Card No. 34-0420.
19.
W.
Wełnic
, A.
Pamungkas
, R.
Detemple
, C.
Steimer
, S.
Blügel
, and M.
Wuttig
, Nature Mater.
5
, 56
(2006
).20.
P. E.
Blöchl
, Phys. Rev. B
50
, 17953
(1994
).21.
G.
Kresse
and J.
Furthmüller
, Phys. Rev. B
54
, 11169
(1996
).22.
J. P.
Perdew
, K.
Burke
, and M.
Ernzerhof
, Phys. Rev. Lett.
77
, 3865
(1996
).23.
H. J.
Monkhorst
and J. D.
Pack
, Phys. Rev. B
13
, 5188
(1976
).© 2010 American Institute of Physics.
2010
American Institute of Physics
You do not currently have access to this content.
