Growth and anisotropic resistivity of PrBa2Cu4O8 and Pr2Ba4Cu7O15-γ single crystals:: A direct probe of metallic Cu-O double chains

被引：60

作者：

Horii, S

Mizutani, U

Ikuta, H

Yamada, Y

Ye, JH

Matsushita, A

Hussey, NE

Takagi, H

Hirabayashi, I

机构：

[1] Nagoya Univ, Dept Crystalline Mat Sci, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[2] Nagoya Univ, Ctr Integrated Res Sci & Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[3] Shimane Univ, Interdisciplinary Fac Sci & Engn, Matsue, Shimane 6908504, Japan

[4] Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan

[5] Univ Tokyo, Inst Solid State Phys, Minato Ku, Tokyo 1068666, Japan

[6] ISTEC, Superconduct Res Lab, Atsuta Ku, Nagoya, Aichi 4568587, Japan

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.61.6327

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have successfully grown single crystals of PrBa2Cu4O8 (Pr124) and Pr2Ba4Cu7O15-y (Pr247) by means of a flux method under high pressure oxygen gas of 11 atm in Al2O3 or MgO crucibles. The most appropriate starting composition for the crystal growth was found to be Pr:Ba:Cu=1:2:3 for both Pr124 and Pr247, by examining the generated phases in samples prepared with widely varying composition and sintering temperature. The temperature dependence of resistivity of Pr124 single crystals exhibited no superconductivity, at least down to 2 K. Resistivity along the b-axis direction showed a highly conductive behavior, of which the origin is attributed to the double-chain site because of the large anisotropy between a- and b-axis resistivities. The anisotropy in resistivity between the a- and b-axis directions was found to be about 17 at room temperature, 275 at 85 K, and 190 at 5 K.

引用

页码：6327 / 6333

页数：7

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