CONDUCTIVITY AND PARACONDUCTIVITY IN (BI,PB)2SR2CAN-1CUNOX WHISKERS

被引：16

作者：

CHEN, XF ^{[1
]}

MARONE, MJ ^{[1
]}

TESSEMA, GX ^{[1
]}

SKOVE, MJ ^{[1
]}

NEVITT, MV ^{[1
]}

MILLER, DJ ^{[1
]}

VEAL, BW ^{[1
]}

机构：

[1] ARGONNE NATL LAB,ARGONNE,IL 60439

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.48.1254

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have measured the resiStiVitY Of (Bi,Pb)2Sr2Can-1CunOx single-crystal whiskers in the a and c directions. Our results indicate that the whiskers may be either 2:2:1:2 (n = 1) or 2:2:2:3 (n = 2) or have both phases present. Well above T(c), the resistivity in the a direction decreases linearly with temperature. We also studied the paraconductivity due to thermal fluctuations above T(c). The paraconductivity in the a direction shows quasi-one-dimensional behavior for temperatures close to T(c). This quasi-one-dimensional behavior may be due to a percolative conduction path. For the c direction, the resistivity is best fit by rho(c) = Ae(-Eg/kT), where T is the temperature. However, as T approaches T(c) from above, rho(c) increases much faster than a thermally activated law, perhaps because of the fluctuations.

引用

页码：1254 / 1257

页数：4

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