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The structure of the high-energy spin excitations in a high-transition-temperature superconductor
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Journal Article
The structure of the high-energy spin excitations in a high-transition-temperature superconductor
2004
Overview
In conventional superconductors, lattice vibrations (phonons) mediate the attraction between electrons that is responsible for superconductivity
1
. The high transition temperatures (high-
T
c
) of the copper oxide superconductors has led to collective spin excitations being proposed as the mediating excitations in these materials
2
. The mediating excitations must be strongly coupled to the conduction electrons, have energy greater than the pairing energy, and be present at
T
c
. The most obvious feature in the magnetic excitations of high-
T
c
superconductors such as YBa
2
Cu
3
O
6+
x
is the so-called ‘resonance’
3
,
4
,
5
,
6
. Although the resonance may be strongly coupled to the superconductivity
3
,
4
,
5
,
6
,
7
,
8
, it is unlikely to be the main cause, because it has not been found in the La
2-
x
(Ba,Sr)
x
CuO
4
family and is not universally present in Bi
2
Sr
2
CaCu
2
O
8+
δ
(ref.
9
). Here we use inelastic neutron scattering to characterize possible mediating excitations at higher energies in YBa
2
Cu
3
O
6.6
. We observe a square-shaped continuum of excitations peaked at incommensurate positions. These excitations have energies greater than the superconducting pairing energy, are present at
T
c
, and have spectral weight far exceeding that of the ‘resonance’. The discovery of similar excitations in La
2–
x
Ba
x
CuO
4
(ref.
10
) suggests that they are a general property of the copper oxides, and a candidate for mediating the electron pairing.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
