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# Spinons in the strongly correlated copper oxide chains in SrCuO2

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### Abstract

We have investigated the spin dynamics in the strongly correlated chain copper oxide SrCuO$$_2$$ for energies up to $$\gtrsim 0.6$$ eV using inelastic neutron scattering. We observe an acoustic band of magnetic excitations which is well described by the "Muller-ansatz" for the two-spinon continuum in the S=1/2 antiferromagnetic Heisenberg spin chain. The lower boundary of the continuum extends up to $$\approx 360$$ meV, which corresponds to an exchange constant $$J = 226(12)$$ meV. Our finding that an effective Heisenberg spin Hamlitonian adequately describes the spin sector of this 1D electron system, even though its energy scale is comparable to that of charge excitations, provides compelling experimental evidence for spin-charge separation.

### Most cited references12

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### Backward Scattering in the One-Dimensional Electron Gas

(1974)
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### Absence of Mott Transition in an Exact Solution of the Short-Range, One-Band Model in One Dimension

(1968)
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### Magnetic Susceptibility of Ideal Spin 1/2 Heisenberg Antiferromagnetic Chain Systems,Sr2CuO3andSrCuO2

(1996)
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### Author and article information

###### Journal
31 December 2003
2003-12-31
###### Article
10.1103/PhysRevLett.93.087202
cond-mat/0312724