Heavy fermion like behavior in layered Ce-based oxysulfides
We have succeeded to obtain an almost single phase of layered oxysulfide CeOCuS and found a heavy fermion like behavior in this compound. It crystallizes in tetragonal LaOAgS-type structure and the lattice parameters a and c are 0.3923 and 0.8333 nm, respectively. They are smaller than those expecte...
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Published in | Journal of alloys and compounds Vol. 408; pp. 101 - 103 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
09.02.2006
|
Subjects | |
Online Access | Get full text |
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Summary: | We have succeeded to obtain an almost single phase of layered oxysulfide CeOCuS and found a heavy fermion like behavior in this compound. It crystallizes in tetragonal LaOAgS-type structure and the lattice parameters
a and
c are 0.3923 and 0.8333 nm, respectively. They are smaller than those expected for trivalent Ce ion. This suggests that Ce ions exist in a mixed valence state. The temperature dependence of the specific heat,
C shows an upturn below about 7 K. It is expressed by the following relation,
C
=
γ
T
+
β
T
3
+
δ
T
3
ln
T
. The value of
γ
is about 324 mJ/mol K
2, which is comparable with that of conventional heavy fermion compounds. The temperature dependence of the electrical resistivity is metallic and obeys the following relation,
ρ
=
ρ
0
+
ρ
1
T
2
+
ρ
2
T
2
ln
T
, below 100 K. The temperature dependence of the magnetic susceptibility is expressed by the sum of Pauli paramagnetic and Curie Weiss terms. The Pauli paramagnetic term has a large value, which corresponds to about 10% that estimated from
γ
. The effective magnetic moment
μ
eff
,
1.62
μ
B
, is smaller than the free ion value of trivalent Ce and indicates about 64% of Ce ions is trivalent. |
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Bibliography: | SourceType-Scholarly Journals-2 ObjectType-Feature-2 ObjectType-Conference Paper-1 content type line 23 SourceType-Conference Papers & Proceedings-1 ObjectType-Article-3 |
ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2005.04.071 |