Charge distribution in (Tl,Pb)Sr2Ca2Cu3O9−σ (Tc=124K): an 17O NMR study

✍ Scribed by Z.P. Han; R. Dupree; A.P. Howes; R.S. Liu; P.P. Edwards

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 177 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)92076-1

✦ Synopsis

170 NMR measurements on (TI,Pb)Sr2Ca2Cu309_ 8 (Tc=124K) show that the Kmght shift of the outer two Cu-O planes (with pyramidal coordlnauon for copper) has a very different behavior to that of the inner plane (with square coordination for copper). The former has a larger magmtude and a weaker temperature dependence in the normal state, whereas the latter is smaller but has a stronger temperature dependence, tmplymg a nonhomogeneous charge distnbuUon and a weak interaction among the Cu-O layers. The results are compared with those for (Bi,Pb)2Sr2Ca2Cu3Olo. ~ (Te=107K) and Tl2Ba2Ca2Cu3010 ~ (Tc=125K).