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Paramagnetic and antiferromagnetic resonances in the diamagnetically diluted Haldane magnet PbNi2V2O8 | | A. I. Smirnov
; V. N. Glazkov
; H.-A. Krug von Nidda
; A. Loidl
; L. N. Demianets
; A. Ya. Shapiro
; | | Date: |
24 Dec 2001 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | The impurity-induced antiferromagnetic ordering of the doped Haldane magnet Pb(Ni{1-x}Mg{x})2V2O8 (0 < x <0.06) was studied by electron spin resonance (ESR) on ceramic samples in the frequency range 9-110 GHz. Below the Néel temperature a transformation of the ESR spectrum was found, indicating an antiferromagnetic resonance mode of spin precession. The excitation gap of the spin-wave spectrum increases with increasing Mg-concentration $x$ in the same manner as the Néel temperature, reaching its maximum value of 80 GHz at x > 0.04. At small concentrations x < 0.02 the signals of antiferromagnetic resonance were found to coexist with the signal of the paramagnetic resonance indicating a microscopic separation of the magnetic phases. | | Source: | arXiv, cond-mat/0112443 | | Services: | Forum | Review | PDF | Favorites | |
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