406 F. Egami, M. IsHiMOTO and S. Taniguchi 



A cknowledgeinen ts 



The authors are deeply indebted to Prof. N. Ui of Gunma University, 

 Drs. C. lida, J. Okuda, K. Takata and Mr. S. Tsukamoto of Nagoya Uni- 

 versity for their kind collaboration and help with physical measurements and 

 chemical analyses. 



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