Nature of conduction in disordered Nd2-xCexCuO4-δ films -: art. no. 014538

被引：15
|
作者：
Woods, SI [1 ]
Katz, AS
Applebaum, SI
de Andrade, MC
Maple, MB
Dynes, RC
机构：
[1] IBM Corp, Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA
[2] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
来源：
PHYSICAL REVIEW B | 2002年 / 66卷 / 01期
关键词：
D O I：
10.1103/PhysRevB.66.014538
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have used resistivity and Hall measurements on ion-irradiated thin films of the cuprate superconductor Nd2-xCexCuO4-delta (NCCO) to explore the full range of transport behavior as a function of disorder in this material from superconductivity to variable-range-hopping (VRH) conduction. The cotangent of the Hall angle (cot Theta(H)) in lightly irradiated samples exhibited a temperature dependence related to that of resistivity, providing support for a recent theory of Varma and Abrahams. The most highly irradiated samples exhibited rho(T)proportional toexp[(T-o/T)(0.5)] at low temperatures, evidence of VRH in the presence of a Coulomb gap. The change of the Hall number with disorder and temperature is analyzed in the framework of possible two-carrier conduction in NCCO.
引用
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页码：1 / 4
页数：4
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