Hole doping of the CuO2 chains in (La,Sr,Ca)(14)Cu24O41

被引：174
|
作者：
Carter, SA [1 ]
Batlogg, B [1 ]
Cava, RJ [1 ]
Krajewski, JJ [1 ]
Peck, WF [1 ]
Rice, TM [1 ]
机构：
[1] ETH ZURICH,CH-8093 ZURICH,SWITZERLAND
来源：
PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 07期
关键词：
D O I：
10.1103/PhysRevLett.77.1378
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Substantial hole doping has been achieved in (La,Sr,Ca)(14)Cu24O41 compounds with CuO2 chain and Cu2O3 ladder building blocks. Holes enter the structural units with larger O/Cu ratios which are the CuO2 chains. The ladders remain undoped and magnetically inert due to a large spin gap. The moments in the undoped chains interact weakly, and every hole added creates a nonmagnetic CuO2 unit and decreases the resistivity. At the maximum hole concentration (similar to 0.6/CuO2) the residual moments form a singlet ground state possibly due to dimerization with an excitation gap of similar to 140 K to the triplet state.
引用
收藏
页码：1378 / 1381
页数：4
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