Crystal growth and transport properties of 4-leg spin-ladder compound La2Cu2O5: Occurrence of insulator-metal transition

C. Sekar; T. Watanabe; A. Matsuda; H. Shibata; Y. Zenitani; J. Akimitsu

doi:10.1016/S1466-6049(01)00127-1

Crystal growth and transport properties of 4-leg spin-ladder compound La₂Cu₂O₅: Occurrence of insulator-metal transition

C. Sekar^*, T. Watanabe, A. Matsuda, H. Shibata, Y. Zenitani, J. Akimitsu

^*Corresponding author for this work

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

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 language	English
Pages (from-to)	1201-1203
Number of pages	3
Journal	International Journal of Inorganic Materials
Volume	3
Issue number	8
DOIs	https://doi.org/10.1016/S1466-6049(01)00127-1
Publication status	Published - 2001
Externally published	Yes

Keywords

LaCuO
Metal-insulator transition
Spin-ladder

ASJC Scopus subject areas

Materials Chemistry

Access to Document

10.1016/S1466-6049(01)00127-1

Cite this

@article{e3dab2eff2874c4f98613f91049c7ad3,

title = "Crystal growth and transport properties of 4-leg spin-ladder compound La2Cu2O5: Occurrence of insulator-metal transition",

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.",

keywords = "LaCuO, Metal-insulator transition, Spin-ladder",

author = "C. Sekar and T. Watanabe and A. Matsuda and H. Shibata and Y. Zenitani and J. Akimitsu",

year = "2001",

doi = "10.1016/S1466-6049(01)00127-1",

language = "English",

volume = "3",

pages = "1201--1203",

journal = "International Journal of Inorganic Materials",

issn = "1466-6049",

publisher = "Elsevier BV",

number = "8",

}

TY - JOUR

T1 - Crystal growth and transport properties of 4-leg spin-ladder compound La2Cu2O5

T2 - Occurrence of insulator-metal transition

AU - Sekar, C.

AU - Watanabe, T.

AU - Matsuda, A.

AU - Shibata, H.

AU - Zenitani, Y.

AU - Akimitsu, J.

PY - 2001

Y1 - 2001

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.

KW - LaCuO

KW - Metal-insulator transition

KW - Spin-ladder

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