Synthesis and Crystal structures of 326-type new cuprates, (Nd,Sr,Ca)_3Cu_2O_6

机译：326型新型铜酸盐（Nd，Sr，Ca）_3Cu_2O_6的合成及晶体结构

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We found a 326-type new cuprate, Nd_2CaCu_2O_6, under high pressure of 6 GPa. X-ray powder diffraction and HRTEM observations revealed that this compound crystallizes in tetragonal system with the space group, I4/mmm and lattice parameters, a chemical bounds 3.8262 (5) and c chemical bounds 19.027 (2) A. It is essentially isomorphous with La_2CaCu_2O_6, which has rock-salt-type blocks instead of fluorite-type ones as the charge reservoir layer. Carrier doping was tried by partial substitution of Sr for Nd in Nd_2CaCu_2O_6, and weak superconducting signal was observed at 18 K in a Nd_(1.6)Sr_(0.4)CaCu_2O_6 sample. The small superconducting volume fraction suggests that only a limited area becomes superconducting owing to a low hole concentration.

机译：我们在6 GPa的高压下发现了326型新的铜酸盐Nd_2CaCu_2O_6。 X射线粉末衍射和HRTEM观察表明，该化合物在具有空间群，I4 / mmm和晶格参数，化学键为3.8262（5）和c化学键为19.027（2）A的四方体系中结晶。 La_2CaCu_2O_6具有岩石盐型块体，而不是萤石型块体作为电荷存储层。通过在Nd_2CaCu_2O_6中用Sr代替Nd尝试进行载流子掺杂，在Nd_（1.6）Sr_（0.4）CaCu_2O_6样品中，在18 K处观察到微弱的超导信号。小的超导体积分数表明，由于空穴浓度低，只有有限的区域成为超导。

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《International symposium on superconductivity;ISS'96》|1997年|p.353-356|共4页
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M.Isobe; Y.Matsui; E.Takayama-Muromachi;
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中图分类 O5;
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high-T_c superconductor; high-pressure synthesis; HRTEM; magnetic susceptibility; electric resistivity;

机译：高T_c超导体;高压合成HRTEM;磁化率;电阻率;

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Synthesis and Crystal structures of 326-type new cuprates, (Nd,Sr,Ca)_3Cu_2O_6

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