Effect of chemical pressure on superconductivity of Nd(Sr_2−xBa_x)(Cu_2.7Mo_0.3)O_z system

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• 作者：Lee ; H.K. ; Trodahl ; H.J.
• 关键词：Superconductivity ; Chemical pressure ; Cuprate ; Raman
• 刊名：Physica C
• 出版年：2003
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：May, 2003
• 卷：388-389
• 期：Complete
• 页码：377-378
• 文件大小：85.8 K

摘要

Nd(Sr_2−xBa_x)(Cu_2.7Mo_0.3)O_z (x=0–1.0) samples were synthesized and examined with respect to the chemical pressure effect. It is found that the non-superconducting phase NdSr₂(Cu_2.7Mo_0.3)O_z can be made superconducting by substitution Ba at the Sr site. Raman measurements indicate that the movement of the apical oxygen toward the CuO₂ planes induced by the chemical pressure is similar to that observed in Y(Ba_2−xSr_x)Cu₃O_z system. Thermoelectric power measurements show that all the samples are underdoped and hole density on the CuO₂ planes decreases as the Sr:Ba ratio raised. These results are discussed in relation to the local structural changes induced by the chemical pressure.