ePubs
The open archive for STFC research publications
Home
About ePubs
Content Policies
News
Help
Privacy/Cookies
Suggest an Enhancement
Contact ePubs
Full Record Details
Persistent URL
http://purl.org/net/epubs/work/51177
Record Status
Checked
Record Id
51177
Title
Effect of covalent bonding on magnetism and the missing neutron intensity in copper oxide compounds
Contributors
AC Walters (UCL)
,
TG Perring (STFC Rutherford Appleton Lab.)
,
J-S Caux (ITP, Amsterdam)
,
AT Savici (BNL)
,
GD Gu (BNL)
,
C-C Lee (BNL)
,
W Ku (BNL)
,
IA Zaliznyak (BNL)
Abstract
Theories involving highly energetic spin fluctuations are among the leading contenders for explaining high-temperature superconductivity in the cuprates1. These theories could be tested by inelastic neutron scattering (INS), as a change in the magnetic scattering intensity that marks the entry into the superconducting state provides a precise quantitative measure of the spin-interaction energy involved in the superconductivity.However, the absolute intensities of spin fluctuations measured in neutron scattering experiments vary widely, and are usually much smaller than expected from fundamental sum rules, resulting in "missing" INS intensity. Here, we solve this problem by studying magnetic excitations in the one-dimensional related compound, Sr2CuO3, for which an exact theory of the dynamical spin response has recently been developed. In this case, the missing INS intensity can be unambiguously identified and associated with the strongly covalent nature of magnetic orbitals.We find that whereas the energies of spin excitations in Sr2CuO3 arewell described by the nearestneighbour spin-1/2 Heisenberg Hamiltonian, the corresponding magnetic INS intensities are modified markedly by the strong 2p-3d hybridization of Cu and O states. Hence, the ionic picture of magnetism, where spins reside on the atomic-like 3d orbitals of Cu2C ions, fails markedly in the cuprates.
Organisation
ISIS
,
ISIS-MAPS
,
STFC
Keywords
Physics
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Nat Phys
5, no. 12 (2009): 867-872.
doi:10.1038/nphys1405
2009
Showing record 1 of 1
Recent Additions
Browse Organisations
Browse Journals/Series
Login to add & manage publications and access information for OA publishing
Username:
Password:
Useful Links
Chadwick & RAL Libraries
SHERPA FACT
SHERPA RoMEO
SHERPA JULIET
Journal Checker Tool
Google Scholar