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Spinons in the strongly correlated copper oxide chains in SrCuO2
I A Zaliznyak1, H Woo, T G Perring
1Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
Physical Review Letters
|September 28, 2004
Summary
Researchers studied spin dynamics in SrCuO2 using neutron scattering. They found a gapless magnetic excitation continuum, confirming the S=1/2 Heisenberg model and yielding an exchange constant J=226(12) meV.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- SrCuO2 is a strongly correlated copper oxide chain material.
- Understanding spin dynamics is crucial for correlated electron systems.
Purpose of the Study:
- Investigate spin dynamics in SrCuO2.
- Characterize magnetic excitations.
- Determine the exchange constant.
Main Methods:
- Inelastic neutron scattering experiments.
- Analysis using the Müller ansatz for two-spinon continuum.
Main Results:
- Observed a gapless continuum of magnetic excitations.
- Continuum well-described by the S=1/2 antiferromagnetic Heisenberg spin chain model.
- Lower boundary of continuum at ~360 meV.
- Exchange constant J=226(12) meV determined.
Conclusions:
- The spin dynamics of SrCuO2 are consistent with a one-dimensional S=1/2 Heisenberg antiferromagnet.
- The Müller ansatz effectively describes the observed magnetic excitation spectrum.