ABOVE-T(C) ANOMALIES OF THE INFRARED-ACTIVE PHONONS IN RBA2CU4O8 (R=DY, HO) AND Y2BA4CU7O15-DELTA SUPERCONDUCTORS

被引：9

作者：

LITVINCHUK, AP ^{[1
]}

THOMSEN, C ^{[1
]}

CARDONA, M ^{[1
]}

KARPINSKI, J ^{[1
]}

KALDIS, E ^{[1
]}

RUSIECKI, S ^{[1
]}

机构：

[1] ETH, FESTKORPERPHYS LAB, CH-8093 ZURICH, SWITZERLAND

来源：

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1993年 / 92卷 / 01期

关键词：

D O I：

10.1007/BF01309161

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report a far-infrared reflectivity study of DyBa2Cu4O8, HoBa2Cu4O8 and YBa4Cu7O15-delta superconductors in the temperature range 10-300 K. The assignment of the z-polarized infrared-acitve vibrations of the rare-earth-ion (R) was verified by the substitution of R. Since the structure of the Y2Ba4Cu7O15-delta compound in z-direction is an ordered sequence of YBa2Cu3O7-delta and YBa2Cu4O8 blocks, the phonon spectrum of Y2Ba4Cu7O15-delta is a superposition of their respective phonon modes. The temperature dependence of the infrared-active phonons in RBa2Cu4O8 and Y2Ba4Cu7O15-delta was analyzed. A narrowing of the plane-oxygen phonon upon sample cooling was found to occur at T(c), as it was reported for single-chain YBa2Cu3O7 materials; however a pronounced frequency softening of this mode for both RBa2Cu4O8 and Y2Ba4Cu7O15-delta was found to start well above T(c), suggesting the interaction of infrared-active phonons with an excitation gap similar to that observed in spin-dependent measurements.

引用

页码：9 / 15

页数：7

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