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Magnetic energy change available to superconducting condensation in optimally doped YBa2Cu3O6.95
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Journal Article
Magnetic energy change available to superconducting condensation in optimally doped YBa2Cu3O6.95
2006
Overview
Understanding the magnetic excitations in high-temperature (high-
T
c
) copper-oxide superconductors is important because they may mediate the electron pairing for superconductivity
1
,
2
. By determining the wavevector (
Q
) and energy (ħ
ω
) dependence of the magnetic excitations, it is possible to calculate the change in the exchange energy available to the superconducting condensation energy
3
,
4
,
5
. For the high-
T
c
superconductor YBa
2
Cu
3
O
6+
x
, the most prominent feature in the magnetic excitations is the resonance
6
,
7
,
8
,
9
,
10
,
11
,
12
. Suggestions that the resonance contributes a major part of the superconducting condensation
4
,
13
have not gained acceptance because the resonance is only a small portion of the total magnetic scattering
12
,
13
,
14
. Here, we report an extensive mapping of magnetic excitations for YBa
2
Cu
3
O
6.95
(
T
c
∼93 K). Absolute intensity measurements of the full spectra allow us to estimate the change in the magnetic exchange energy between the normal and superconducting states, which is about 15 times larger than the superconducting condensation energy
15
,
16
—more than enough to provide the driving force for high-
T
c
superconductivity in YBa
2
Cu
3
O
6.95
.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
