Metal-insulator transition in the S = 1/2 spin ladder system (Sr0.4Ca0.6)14Cu24-xCo xO41-δ

J. Akimitsu; M. Uehara; T. Nagata; S. Matsumoto; Y. Kitaoka; H. Takahashi; N. Môri

doi:10.1016/0921-4534(95)00726-1

Metal-insulator transition in the S = 1/2 spin ladder system (Sr_0.4Ca_0.6)₁₄Cu_24-xCo _xO_41-δ

J. Akimitsu, M. Uehara, T. Nagata, S. Matsumoto, Y. Kitaoka, H. Takahashi, N. Môri

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

We have confirmed that the (Sr_0.4Ca_0.6)₁₄Cu_24-xCo _xO_41-δ system with x = 0 has a spin gap of 735 K from NMR measurement. This system shows a metal-insulator transition at Co content x between 2.9 and 4.5 after high-pressure O₂ annealing (650°C, 8 MPa, 20 h). The behavior of the electrical resistivity for the high-pressure O₂ annealed sample with x = 4.8 can be characterized by the one-dimensional variable range hopping scheme at low temperature. These facts can be interpreted as the trapped hole carriers in the 1D CuO₂ chain being released into the ladder by Co doping x above 2.9 under high-pressure O₂ annealing.

Original language	English
Pages (from-to)	475-481
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	263
Issue number	1-4
DOIs	https://doi.org/10.1016/0921-4534(95)00726-1
Publication status	Published - May 1996
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(95)00726-1

Cite this

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title = "Metal-insulator transition in the S = 1/2 spin ladder system (Sr0.4Ca0.6)14Cu24-xCo xO41-δ",

abstract = "We have confirmed that the (Sr0.4Ca0.6)14Cu24-xCo xO41-δ system with x = 0 has a spin gap of 735 K from NMR measurement. This system shows a metal-insulator transition at Co content x between 2.9 and 4.5 after high-pressure O2 annealing (650°C, 8 MPa, 20 h). The behavior of the electrical resistivity for the high-pressure O2 annealed sample with x = 4.8 can be characterized by the one-dimensional variable range hopping scheme at low temperature. These facts can be interpreted as the trapped hole carriers in the 1D CuO2 chain being released into the ladder by Co doping x above 2.9 under high-pressure O2 annealing.",

author = "J. Akimitsu and M. Uehara and T. Nagata and S. Matsumoto and Y. Kitaoka and H. Takahashi and N. M{\^o}ri",

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T1 - Metal-insulator transition in the S = 1/2 spin ladder system (Sr0.4Ca0.6)14Cu24-xCo xO41-δ

AU - Akimitsu, J.

AU - Uehara, M.

AU - Nagata, T.

AU - Matsumoto, S.

AU - Kitaoka, Y.

AU - Takahashi, H.

AU - Môri, N.

PY - 1996/5

Y1 - 1996/5

N2 - We have confirmed that the (Sr0.4Ca0.6)14Cu24-xCo xO41-δ system with x = 0 has a spin gap of 735 K from NMR measurement. This system shows a metal-insulator transition at Co content x between 2.9 and 4.5 after high-pressure O2 annealing (650°C, 8 MPa, 20 h). The behavior of the electrical resistivity for the high-pressure O2 annealed sample with x = 4.8 can be characterized by the one-dimensional variable range hopping scheme at low temperature. These facts can be interpreted as the trapped hole carriers in the 1D CuO2 chain being released into the ladder by Co doping x above 2.9 under high-pressure O2 annealing.

AB - We have confirmed that the (Sr0.4Ca0.6)14Cu24-xCo xO41-δ system with x = 0 has a spin gap of 735 K from NMR measurement. This system shows a metal-insulator transition at Co content x between 2.9 and 4.5 after high-pressure O2 annealing (650°C, 8 MPa, 20 h). The behavior of the electrical resistivity for the high-pressure O2 annealed sample with x = 4.8 can be characterized by the one-dimensional variable range hopping scheme at low temperature. These facts can be interpreted as the trapped hole carriers in the 1D CuO2 chain being released into the ladder by Co doping x above 2.9 under high-pressure O2 annealing.

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Metal-insulator transition in the S = 1/2 spin ladder system (Sr_0.4Ca_0.6)₁₄Cu_24-xCo _xO_41-δ

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