Two-dimensional geometry of spin excitations in the high-transition-temperature superconductor YBa2Cu3O6+x
The fundamental building block of the copper oxide superconductors is a Cu 4 O 4 square plaquette. The plaquettes in most of these materials are slightly distorted to form a rectangular lattice, for which an influential theory predicts that high-transition-temperature (high- T c ) superconductivity...
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| Vydáno v: | Nature (London) Ročník 430; číslo 7000; s. 650 - 654 |
|---|---|
| Hlavní autoři: | , , , , , , , , , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
| Vydáno: |
London
Nature Publishing Group UK
05.08.2004
Nature Publishing Group |
| Témata: | |
| ISSN: | 0028-0836, 1476-4687, 1476-4687 |
| On-line přístup: | Získat plný text |
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| Shrnutí: | The fundamental building block of the copper oxide superconductors is a Cu
4
O
4
square plaquette. The plaquettes in most of these materials are slightly distorted to form a rectangular lattice, for which an influential theory predicts that high-transition-temperature (high-
T
c
) superconductivity is nucleated in ‘stripes’ aligned along one of the axes
1
,
2
,
3
. This theory received strong support from experiments that indicated a one-dimensional character for the magnetic excitations in the high-
T
c
material YBa
2
Cu
3
O
6.6
(ref.
4
). Here we report neutron scattering data on ‘untwinned’ YBa
2
Cu
3
O
6+
x
crystals, in which the orientation of the rectangular lattice is maintained throughout the entire volume. Contrary to the earlier claim
4
, we demonstrate that the geometry of the magnetic fluctuations is two-dimensional. Rigid stripe arrays therefore appear to be ruled out over a wide range of doping levels in YBa
2
Cu
3
O
6+
x
, but the data may be consistent with liquid-crystalline stripe order
5
. The debate about stripes has therefore been reopened. |
|---|---|
| Bibliografie: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 ObjectType-Article-2 ObjectType-Feature-1 content type line 23 |
| ISSN: | 0028-0836 1476-4687 1476-4687 |
| DOI: | 10.1038/nature02774 |