Single-crystal growth and dependences on the hole concentration and magnetic field of the magnetic ground state in the edge-sharing CuO$_2$ chain system Ca$_{2+x}$Y$_{2-x}$Cu$_5$O$_{10}$

K. Kudo; S. Kurogi; Y. Koike; T. Nishizaki; N. Kobayashi

doi:10.1103/PhysRevB.71.104413

paper

Single-crystal growth and dependences on the hole concentration and magnetic field of the magnetic ground state in the edge-sharing CuO $_{2}$ chain system Ca $_{2 + x}$ Y $_{2 - x}$ Cu $_{5}$ O $_{10}$

arXiv:cond-mat/0408628 · doi:10.1103/PhysRevB.71.104413

Abstract

We have succeeded in growing large-size single-crystals of Ca $_{2 + x}$ Y $_{2 - x}$ Cu $_{5}$ O $_{10}$ with $0 \leq x \leq 1.67$ 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 $0 \leq x \leq 1.3$ , 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 $\sim$ 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 one suggested in Ca $_{1 - x}$ CuO $_{2}$ has been found in Ca $_{2 + x}$ Y $_{2 - x}$ Cu $_{5}$ O $_{10}$ .

13 pages, 12 figures, 1 table

Single-crystal growth and dependences on the hole concentration and magnetic field of the magnetic ground state in the edge-sharing CuO2​ chain system Ca2+x​Y2−x​Cu5​O10​

Abstract

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Single-crystal growth and dependences on the hole concentration and magnetic field of the magnetic ground state in the edge-sharing CuO $_{2}$ chain system Ca $_{2 + x}$ Y $_{2 - x}$ Cu $_{5}$ O $_{10}$