S=1 AND S=2 EPR SIGNALS IN MODIFIED CUO AND BACUO2

被引：19

作者：

SINGH, RJ

PUNNOOSE, A

MATHEW, J

MAURYA, BP

UMAR, M

HAQUE, MI

机构：

[1] ALIGARH MUSLIM UNIV, UNIV POLYTECH, ALIGARH, INDIA

[2] ALIGARH MUSLIM UNIV, AJMAL KHAN TIBBIYA COLL, ALIGARH, INDIA

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.49.1346

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

EPR spectra of (i) CuO annealed in air at different temperatures up to 900 degrees C and (ii) CuO reacted with BaO in the ratio 3:2 at different temperatures up to 900 degrees C were studied. In (i), evidence for the formation of monomers, dimers, and tetramers of copper ions was found. In (ii), in addition to those spectra obtained in (i), aggregates of four copper ions coupled through cyclic exchange with resultant electronic spin S = 2 and affected by the immediate barium neighbors were obtained. It is found that these copper aggregates giving the EPR signals are magnetically isolated from the main CuO cluster.

引用

页码：1346 / 1349

页数：4

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