The electronic structure of elemental silicon has been studied under high pressure using high-energy Compton scattering utilizing synchrotron radiation. The experiment was realized using a special Laue monochromator and a novel assembly of compound refractive lenses. The extremely good focusing enabled us to utilize a Mao–Bell version of the Merrill–Basset diamond anvil cell with a Be gasket up to a pressure of 20 GPa. After the careful subtraction of background scattering, the Compton profile difference for the metastable Si-XII to the Si-V phase was extracted and compared with the theory. The results clearly demonstrate the feasibility and potential of the Compton scattering technique as a complementary tool in the study of electronic structure of materials under high pressure.

1.
K.
Hämäläinen
,
S.
Huotari
,
J.
Laukkanen
,
A.
Soininen
,
S.
Manninen
,
C.-C.
Kao
,
T.
Buslaps
, and
M.
Mezouar
,
Phys. Rev. B
62
,
R735
(
2000
).
2.
G.
Oomi
,
F.
Honda
,
T.
Kagayama
,
F.
Itoh
,
H.
Sakurai
,
H.
Kawata
, and
O.
Shimomura
,
J. Synchrotron Radiat.
5
,
932
(
1998
).
3.
A.
Snigirev
,
V.
Kohn
,
I.
Snigireva
,
B.
Lengeler
,
Nature (London)
384
,
49
(
1996
);
A.
Snigirev
,
I.
Snigireva
,
M.
Di Michiel
,
V.
Honkimäki
,
M. V.
Grigoriev
,
V. P.
Nazmov
,
E. F.
Reznikova
,
J.
Mohr
, and
V.
Saile
,
Proc. SPIE
5539
,
244
(
2004
).
4.
K H.
Mao
,
P. M.
Bell
,
J. W.
Shanner
, and
D. J.
Steinberg
,
J. Appl. Phys.
49
,
3276
(
1978
).
5.
L.
Merill
and
W. A.
Bassett
,
Rev. Sci. Instrum.
45
,
290
(
1974
).
6.
W. L.
Vos
and
J. A.
Schouten
,
J. Appl. Phys.
69
,
6745
(
1991
).
7.
D. D.
Ragan
,
R.
Gustavsen
, and
D.
Schiferl
,
J. Appl. Phys.
72
,
5539
(
1992
).
8.
J.
Yen
and
M.
Nicol
,
J. Appl. Phys.
72
,
5535
(
1992
).
9.
F.
Biggs
,
L. B.
Mendelsohn
, and
J. B.
Mann
,
At. Data Nucl. Data Tables
16
,
201
(
1975
).
10.
C.
Pisani
,
R.
Dovesi
, and
C.
Roetti
,
Hartree–Fock Ab-Initio of Crystalline Systems
,
Lecture Notes in Chemistry
Vol.
48
, (
Springer
, Heidelberg,
1988
).
11.
M.
Causa
,
R.
Dovesi
,
C.
Pisani
,
R.
Colle
, and
A.
Fortunelli
,
Phys. Rev. B
36
,
891
(
1987
).
12.
M. D.
Towler
,
M.
Causa’
, and
A.
Zupan
,
Comput. Phys. Commun.
98
,
181
(
1996
).
13.
Y.
Sakurai
,
Y.
Tanaka
,
A.
Bansil
,
S.
Kaprzyk
,
A. T.
Stewart
,
Y.
Nagashima
,
T.
Hyodo
,
S.
Nanao
,
H.
Kawata
, and
N.
Shiotani
,
Phys. Rev. Lett.
74
,
2252
(
1995
).
14.
A. D.
Becke
,
Phys. Rev. A
38
,
3098
(
1988
).
15.
J. P.
Perdew
and
A.
Zunger
,
Phys. Rev. B
23
,
5048
(
1981
).
16.
A. R.
Porter
,
M. D.
Towler
, and
R. J.
Needs
,
Phys. Rev. B
60
,
13534
(
1999
).
17.
Z.
Hu
and
I. L.
Spain
,
Solid State Commun.
51
,
263
(
1984
).
18.
M. I.
McMahon
,
R. J.
Nelmes
,
N. G.
Wright
, and
D. R.
Allan
,
Phys. Rev. B
50
,
739
(
1994
).
19.
H.
Olijnyk
,
S. K.
Sakka
, and
W. B.
Holzapfel
,
Phys. Lett.
103A
,
137
(
1984
).
20.
J.
Lin
,
J.
Shu
,
H.-K
Mao
, and
R. J.
Hemley
,
Rev. Sci. Instrum.
74
,
4732
(
2003
).
You do not currently have access to this content.