Journal
PHYSICAL REVIEW B
Volume 88, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.104411
Keywords
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Funding
- Russian Foundation for Basic Research [12-02-00557-a, 10-02-01105-a, 11-02-92707-IND-a]
- Program of Russian Scientific Schools
- German Research Society (DFG) within the Transregional Collaborative Research Center [TRR 80]
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We present the results of magnetization, electron spin resonance (ESR), and nuclear magnetic resonance (NMR) measurements on single-crystal samples of the frustrated S = 1/2 chain cuprate LiCu2O2 doped with nonmagnetic Zn2+. As shown by the x-ray techniques, the crystals of Li(Cu1-xZnx)(2)O-2 with x < 0.12 are single-phase, whereas for higher Zn concentrations the samples were polyphase. ESR spectra for all monophase samples (0 <= x < 0.12) can be explained within the model of a planar spin structure with a uniaxial type anisotropy. The NMR spectra of the highly doped single-crystal sample Li(Cu0.9Zn0.1)(2)O-2 can be described in the frame of a planar spin-glass-like magnetic structure with short-range spiral correlations in the crystal ab planes with strongest exchange bonds. The value of magnetic moments of Cu2+ ions in this structure is close to the value obtained for undoped crystals: (0.8 +/- 0.1) mu(B)
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