We have succeeded in growing large-size single crystals of Ca 2+xY 2-xCu 5O 10 with 0≤x≤ 1.67 and measured the magnetic susceptibility, specific heat, and magnetization curve, in order to study the magnetic ground state in the edge-sharing CuO 2 chain as a function of hole concentration and magnetic field. In the range 0≤x≤ 1.3, 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 ∼1/3 per 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-xCuO 2 has been found in Ca 2+xY 2-xCu 5O 10.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Mar 1 2005|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics