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$mu$SR study of the quantum dynamics in the frustrated $S=3/2$ kagome bilayers | | David Bono
; P. Mendels
; G. Collin
; N. Blanchard
; F. Bert
; A. Amato
; C. Baines
; A.D. Hillier
; | | Date: |
10 Sep 2004 | | Journal: | Physical Review Letters 93 (2004) 187201 DOI: 10.1103/PhysRevLett.93.187201 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | LPS), P. Mendels (LPS), G. Collin (LLB), N. Blanchard (LPS), F. Bert (LPS), A. Amato (PSI), C. Baines (PSI), A.D. Hillier (ISIS | | Abstract: | We present $mu$SR experiments in the $S=3/2$ kagome bilayer compound Ba$_{2}$Sn$_{2}$ZnGa$_{10-7p}$Cr$_{7p}$O$_{22}$ (BSZCGO$(p)$) and compare it to the isostructural SrCr$_{9p}$Ga$_{12-9p}$O$_{19}$ (SCGO$(p)$), including for the latter new results for $pgeq0.89$. Quantum-dynamical low energy magnetic excitations are evidenced in this novel compound. We study the evolution of the muon relaxation rate with $p$, $T$ and field. A phenomenological model for the muon relaxation based on sporadic dynamics due to spin excitations in a singlet sea proposed by Uemura emph{et al.} [Phys. Rev. Lett. extbf{73}, 3306 (1994)]. is extended to all fields and $T$-range. Its connexion to the RVB picture is discussed, and we argue that such coherent states might mediate the interactions between "impurities" which induce the spin glass freezing. | | Source: | arXiv, cond-mat/0409257 | | Services: | Forum | Review | PDF | Favorites | |
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