2004/04/20 by Masashi Hase, Haruhiko Kuroe, Kiyoshi Ozawa +5 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.other
paper · pdf · doi:10.1103/physrevb.70.104426
6 pages, 4 figures
arxiv created 2004/04/20 · openalex publication_date 2004/09/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have investigated magnetic properties of Rb2Cu2Mo3O12 powder. Temperature dependence of magnetic susceptibility and magnetic-field dependence of magnetization have shown that this cuprate can be considered as a compound of a one-dimensional spin-1∕2 Heisenberg system with ferromagnetic first-nearest-neighbor (1NN) and antiferromagnetic second-nearest-neighbor (2NN) competing interactions (competing system). Values of the 1NN and 2NN exchange interactions are estimated as J1=\ensuremath-138\phantom\rule0.3em0exK and J2=51\phantom\rule0.3em0exK (\ensuremathα\ensuremath≡J2∕J1=\ensuremath-0.37). This value of \ensuremathα suggests that the ground state is a spin-singlet incommensurate state. In spite of relatively large J1 and J2, no magnetic phase transition appears down to 2\phantom\rule0.3em0exK, while an antiferromagnetic transition occurs in other model compounds of the competing system with ferromagnetic 1NN interaction. For that reason, Rb2Cu2Mo3O12 is a suitable compound to study properties of the incommensurate ground state that are unconfirmed experimentally.