LOW-ENERGY RAMAN CONTINUUM IN OVERDOPED Y 1− xCa xBa 2Cu 3O 7 FILMS
We investigate Y 1− x Ca x Ba 2Cu 3O 7 films on SrTiO 3(100) substrates which are overdoped due to high oxygen contents and Ca substitution. The good in-plane orientation of the c-axis-oriented films allows us to study excitations with A 1g and B 1g symmetry. Our analysis reveals that at high doping...
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Published in | The Journal of physics and chemistry of solids Vol. 59; no. 10; pp. 1958 - 1961 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
1998
|
Online Access | Get full text |
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Summary: | We investigate Y
1−
x
Ca
x
Ba
2Cu
3O
7 films on SrTiO
3(100) substrates which are overdoped due to high oxygen contents and Ca substitution. The good in-plane orientation of the
c-axis-oriented films allows us to study excitations with A
1g and B
1g symmetry. Our analysis reveals that at high doping the B
1g Raman-active phonon at 340
cm
−1 behaves significantly differently from what has been observed so far, showing vanishing softening as well as strong broadening and no increasing intensity below
T
c. The observed behavior correlates with the fact that the energy of the so-called “2
Δ peak” that forms out of the continuum in B
1g symmetry is below the phonon energy at higher doping. |
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ISSN: | 0022-3697 1879-2553 |
DOI: | 10.1016/S0022-3697(98)00143-7 |