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Cu Nuclear Quadrupole Resonance Study of the Spin-Peierls Compound Cu1-xMgxGeO3: A Possibility of Precursory Dimerization | | Y. Itoh
; T. Machi
; N. Koshizuka
; T. Masuda
; K. Uchinokura
; | | Date: |
17 Jul 2001 | | Journal: | Phys. Rev. B 65 (2002) R100406 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | We report on a zero-field 63Cu nuclear quadrupole resonance (NQR) study of nonmagnetic Mg impurity substituted Cu1-xMgxGeO3 (single crystals; the spin-Peierls transition temperature Tsp~14, 13.5, and 11 K for x=0, 0.0043, and 0.020) in a temperature range from 4.2 K to 250 K. We found that below T*~77 K, Cu NQR spectra are broadened and nonexponential Cu nuclear spin-lattice relaxation increases for undoped and more remarkably for Mg-doped samples. The results indicate that random lattice distortion and impurity-induced spins appear below T*, which we associate with a precursor of the spin-Peierls transition. Conventional magnetic critical slowing down does not appear down to 4.2 K below Tsp. | | Source: | arXiv, cond-mat/0107353 | | Services: | Forum | Review | PDF | Favorites | |
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