We demonstrate the synthesis and magnetic properties of a quasi-two-dimensional frustrated quantum spin system (CuCl) La (Nb1-x Tax) 2 O7. We observed persistence of the spin-singlet state in (CuCl) LaNb2 O7 up to x∼0.4, accompanied by a slight reduction in the spin gap with increasing x. In spite of unaltered cell parameters and a preserved CuCl plane, (CuCl) LaTa2 O7 exhibits collinear antiferromagnetic (CAF) order with TN ∼7 K as observed in (CuBr) LaNb2 O7. In the intermediate region (0.4<x<1), we observed CAF order with a significantly reduced magnetic moment but with a nearly constant TN, suggesting that the CAF state coexists with the spin-singlet state in agreement with recent μSR results.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2009 Nov 13|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics