Quantum phase transition in (CuCl) la (Nb1-x Tax) 2 O7

A. Kitada, Y. Tsujimoto, H. Kageyama, Y. Ajiro, M. Nishi, Y. Narumi, K. Kindo, M. Ichihara, Y. Ueda, Y. J. Uemura, K. Yoshimura

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21 Citations (Scopus)


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.

Original languageEnglish
Article number174409
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
Publication statusPublished - 2009 Nov 13
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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