Hole Doping of the CuO2 Chains in (La,Sr,Ca)14Cu24O41.
Hole Doping of the CuO2 Chains in (La,Sr,Ca)14Cu24O41.
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DOI：
10.1103/physrevlett.77.1378
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发表时间：
1996-08
影响因子：
8.6
通讯作者：
Carter;Batlogg;Cava;Krajewski;Peck;Rice
中科院分区：
文献类型：
--
作者：
Carter;Batlogg;Cava;Krajewski;Peck;Rice
在具有CuO 2链和Cu 2 O3梯形结构单元的（La，Sr，Ca）14 Cu 24 O 41化合物中实现了空穴掺杂。空穴进入O/Cu比较大的结构单元，即CuO 2链。由于大的自旋能隙，梯子保持未掺杂和磁惰性。未掺杂的链中的磁矩相互作用很弱，每增加一个空穴就产生一个CuO 2单元，从而降低电阻率.在最大空穴浓度（100. 6/CuO 2）的剩余磁矩形成单重基态，可能是由于二聚作用，激发能隙为140 K。
Substantial hole doping has been achieved in (La, Sr, Ca) 14 C u 24 O 41 compounds with Cu O 2 chain and C u 2 O 3 ladder building blocks. Holes enter the structural units with larger O/Cu ratios which are the Cu O 2 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 Cu O 2 unit and decreases the resistivity. At the maximum hole concentration (∼ 0. 6/CuO 2) the residual moments form a singlet ground state possibly due to dimerization with an excitation gap of∼ 140 K to the triplet state.