ENERGY GAPS OF ND1.85CE0.15CUO4-Y AND ND1.85TH0.15CUO4-Y DETERMINED BY FAR-INFRARED SPECTROSCOPY

被引：23

作者：

WANG, SH ^{[1
]}

SONG, Q ^{[1
]}

CLAYMAN, BP ^{[1
]}

PENG, JL ^{[1
]}

ZHANG, L ^{[1
]}

SHELTON, RN ^{[1
]}

机构：

[1] UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.64.1067

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Reflectance spectra of polycrystalline n-type ceramic superconductors Nd1.85R0.15CuO4-y(R=Ce and Th) were measured over the range from 2 to 300 K from 20 to 10 000 cm-1. The spectra and reflectance ratios show a number of prominent features. Those which show no significant temperature dependence over this temperature range are assigned to lattice vibrations of free-carrier excitations. Increases in reflectivity below about 50 cm-1 occur on the transition into the superconducting state. Energy gaps inferred from them for excitations along the c axis are in the range predicted by BCS theory. © 1990 The American Physical Society.

引用

页码：1067 / 1070

页数：4

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