Single-crystal growth and the dependence on hole concentration and magnetic field of the magnetic ground state in the edge-sharing CuO 2 chain system Ca 2+xY 2-xCu 5O 10

Kazutaka Kudo, S. Kurogi, Y. Koike, T. Nishizaki, N. Kobayashi

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Abstract

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.

Original languageEnglish
Article number104413
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number10
DOIs
Publication statusPublished - Mar 1 2005
Externally publishedYes

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Hole concentration
Crystallization
Crystal growth
Ground state
crystal growth
Single crystals
Magnetic fields
Spin glass
ground state
single crystals
Magnetic susceptibility
magnetic fields
Superconducting transition temperature
Specific heat
Magnetization
spin glass
transition temperature
specific heat
magnetic permeability
magnetization

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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abstract = "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.",
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AU - Kudo, Kazutaka

AU - Kurogi, S.

AU - Koike, Y.

AU - Nishizaki, T.

AU - Kobayashi, N.

PY - 2005/3/1

Y1 - 2005/3/1

N2 - 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.

AB - 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.

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