Crystal growth and transport properties of 4-leg spin-ladder compound La2Cu2O5

Occurrence of insulator-metal transition

C. Sekar, T. Watanabe, Azusa Matsuda, H. Shibata, Y. Zenitani, J. Akimitsu

Research output: Contribution to journalArticle

Abstract

A remarkable metal-insulator transition has been observed, for the first time, in hole-doped spin ladder compound La2Cu2O5 (4-leg) single crystals. Hole-doping was carried out by means of high-oxygen-pressure annealing at 600°C under a pressure of 400 atm (20%O2+80%Ar at a total pressure of 2000 atm) using a hot-isostatic-pressing (HIP) furnace. In order to realize metallicity, a prolonged HIP-treatment for about 22 days or more is required. However, this annealing period is reduced to about 5-6 days, when the crystals are grown from the starting charges containing Ag in the form of Ag2O. Even in the as-grown state, the measured room-temperature resistivity is about two to three orders of magnitude lower than that of La2Cu2O5 Crystals grown from charges without silver. The results show that the silver addition facilitates the oxygenation of the La2Cu2O5 crystals.

Original languageEnglish
Pages (from-to)1201-1203
Number of pages3
JournalInternational Journal of Inorganic Materials
Volume3
Issue number8
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Metal insulator transition
Ladders
Crystallization
Crystal growth
Transport properties
Hot isostatic pressing
Silver
Crystals
Annealing
Oxygenation
Furnaces
Doping (additives)
Single crystals
Oxygen
Temperature

Keywords

  • LaCuO
  • Metal-insulator transition
  • Spin-ladder

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Crystal growth and transport properties of 4-leg spin-ladder compound La2Cu2O5 : Occurrence of insulator-metal transition. / Sekar, C.; Watanabe, T.; Matsuda, Azusa; Shibata, H.; Zenitani, Y.; Akimitsu, J.

In: International Journal of Inorganic Materials, Vol. 3, No. 8, 2001, p. 1201-1203.

Research output: Contribution to journalArticle

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AU - Sekar, C.

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AU - Matsuda, Azusa

AU - Shibata, H.

AU - Zenitani, Y.

AU - Akimitsu, J.

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N2 - A remarkable metal-insulator transition has been observed, for the first time, in hole-doped spin ladder compound La2Cu2O5 (4-leg) single crystals. Hole-doping was carried out by means of high-oxygen-pressure annealing at 600°C under a pressure of 400 atm (20%O2+80%Ar at a total pressure of 2000 atm) using a hot-isostatic-pressing (HIP) furnace. In order to realize metallicity, a prolonged HIP-treatment for about 22 days or more is required. However, this annealing period is reduced to about 5-6 days, when the crystals are grown from the starting charges containing Ag in the form of Ag2O. Even in the as-grown state, the measured room-temperature resistivity is about two to three orders of magnitude lower than that of La2Cu2O5 Crystals grown from charges without silver. The results show that the silver addition facilitates the oxygenation of the La2Cu2O5 crystals.

AB - A remarkable metal-insulator transition has been observed, for the first time, in hole-doped spin ladder compound La2Cu2O5 (4-leg) single crystals. Hole-doping was carried out by means of high-oxygen-pressure annealing at 600°C under a pressure of 400 atm (20%O2+80%Ar at a total pressure of 2000 atm) using a hot-isostatic-pressing (HIP) furnace. In order to realize metallicity, a prolonged HIP-treatment for about 22 days or more is required. However, this annealing period is reduced to about 5-6 days, when the crystals are grown from the starting charges containing Ag in the form of Ag2O. Even in the as-grown state, the measured room-temperature resistivity is about two to three orders of magnitude lower than that of La2Cu2O5 Crystals grown from charges without silver. The results show that the silver addition facilitates the oxygenation of the La2Cu2O5 crystals.

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