2004/08/28 by K. Kudo, S. Kurogi, Y. Koike +4
Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.71.104413
published as Phys. Rev. B 71, 104413 (2005). · 13 pages, 12 figures, 1 table
arxiv created 2004/08/28 · openalex publication_date 2005/03/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have succeeded in growing large-size single crystals of Ca2+xY_2\ensuremath-xCu5O10 with 0\ensuremath\leqslantx\ensuremath\leqslant1.67 and measured the magnetic susceptibility, specific heat, and magnetization curve, in order to study the magnetic ground state in the edge-sharing CuO2 chain as a function of hole concentration and magnetic field. In the range 0\ensuremath\leqslantx\ensuremath\leqslant1.3, it has been found that an antiferromagnetically ordered phase with the magnetic easy axis along the b axis is stabilized and that a spin-flop transition occurs by the application of magnetic fields parallel to the b axis. The antiferromagnetic transition temperature decreases with increasing x and disappears around x=1.4. Alternatively, a spin-glass phase appears around x=1.5. At x=1.67 where the hole concentration is \ensuremath∼1∕3\phantom\rule0.3em0exper Cu, it appears that a spin-gap state is formed owing to the formation of spin-singlet pairs. No sign of the coexistence of an antiferromagnetically ordered state and a spin-gap state as seen in Ca_1\ensuremath-xCuO2 has been found in Ca2+xY_2\ensuremath-xCu5O10.