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Crystal Growth, Structure, and Transport Properties of the Five-Leg Spin Ladder Compound La8Cu7O19

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

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 218 KB
Volume: 156
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.9017

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✦ Synopsis

The crystallization region of La 8 Cu 7 O 19 exists in a narrow temperature (1045+10503C) and composition range (1:4.5+ 1:5.0; La 2 O 3 :CuO molar ratio) in the La 2 O 3 +CuO system in an air ambient. In this narrow range, we have succeeded in growing large La 8 Cu 7 O 19 single crystals, for the 5rst time, by a modi5ed slow cooling method. Single-crystal X-ray di4raction analysis reveals that La 8 Cu 7 O 19 crystallizes in a monoclinic structure with space group C2/c and has the lattice parameters a ‫؍‬ 13.82(7) A > , b ‫؍‬ 3.734(8) A > , c ‫؍‬ 34.77(10) A > , and ‫؍‬ 99.3(4)3. The electrical transport behavior of the as-grown and hole-doped La 8 Cu 7 O 19 single crystals are semiconducting. A lowest resistivity of 11.0 m -cm is measured at 293 K along the ladder direction (# #b-axis) for the hole-doped samples.

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