2004/09/13 by David Bono, D. Bono, P. Mendels +6 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.93.187201
published as Physical Review Letters 93 (2004) 187201 · 4 figures, only minor changes as compared to previous version
arxiv created 2004/09/13 · openalex publication_date 2004/10/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present \ensuremathμSR experiments in the S=(3)/(2) kagom'e bilayer compound Ba2Sn2ZnGa_10\ensuremath-7pCr7pO22 [BSZCGO(p)] and compare it to the isostructural SrCr9pGa_12\ensuremath-9pO19 [SCGO(p)], including for the latter new results for p\ensuremath≥0.89. 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 et al. is extended to all fields and T range. Its connection 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.