Absence of Edge Localized Moments in the Doped Spin-Peierls System CuGe$_{1-x}$Si$_{x}$O$_3$

Details Absence of Edge Localized Moments in the Doped Spin-Peierls System CuGe$_{1-x}$Si$_{x}$O$_3$ Absence of Edge Localized Moments in the Doped Spin-Peierls System CuGe$_{1-x}$Si$_{x}$O$_3$

2001-08-02

arxiv.org/abs/cond-mat/0108036v2

Phys. Rev. Lett. 88, 037603 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.037603

We report the observation of nuclear quadrupole resonance (NQR) of Cu from the sites near the doping center in the spin-Peierls system CuGe$_{1-x}$Si$_{x}$O$_3$. The signal appears as the satellites in the Cu NQR spectrum, and has a suppressed nuclear spin-lattice relaxation rate indicative of a singlet correlation rather than an enhanced magnetic correlation near the doping center. Signal loss of Cu nuclei with no neighboring Si is also observed. We conclude from these observations that the doping-induced moments are not in the vicinity of the doping center but rather away from it.

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