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An inelastic neutron scattering study was performed on a Zn-substitutedspin-1/2 Heisenberg 2-leg ladder compound Sr(Cu1-xZnx)2O3 (x < 0.04) toinvestigate nonmagnetic impurity effects on the quantum spin system with alarge spin gap of about 400 K. The magnitude of the spin gap was found to beindependent of Zn concentration, 33 meV, while the integrated magneticscattering which corresponds to the singlet-triplet excitation decreasedmonotonically with increasing x. On account of the total-sum rule, this resultsupports the existence of a finite in-gap density of states at E = 0 which wassuggested from the T-linear magnetic specific heat.Comment: RevTex, 9 pages, 4 figure

journal of the physical society of japan

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