Disappearance of the Spin Gap in a Zn doped 2-Leg Ladder Compound Sr(Cu1-xZnx)2O3

Details Disappearance of the Spin Gap in a Zn doped 2-Leg Ladder Compound Sr(Cu1-xZnx)2O3 Disappearance of the Spin Gap in a Zn doped 2-Leg Ladder Compound Sr(Cu1-xZnx)2O3

1997-06-17

arxiv.org/abs/cond-mat/9706170v1

Physics

Condensed Matter

RevTex, 9 pages, 4 figures

Scientific paper

10.1143/JPSJ.67.740

An inelastic neutron scattering study was performed on a Zn-substituted spin-1/2 Heisenberg 2-leg ladder compound Sr(Cu1-xZnx)2O3 (x < 0.04) to investigate nonmagnetic impurity effects on the quantum spin system with a large spin gap of about 400 K. The magnitude of the spin gap was found to be independent of Zn concentration, 33 meV, while the integrated magnetic scattering which corresponds to the singlet-triplet excitation decreased monotonically with increasing x. On account of the total-sum rule, this result supports the existence of a finite in-gap density of states at E = 0 which was suggested from the T-linear magnetic specific heat.

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