Search for a novel double honeycomb lattice superconductor
Search for a novel double honeycomb lattice superconductor
批准号:
13640347
负责人:
SHAMOTO Shin-ichi
金额:
$2.3万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (C)
财政年份:
2001
资助国家:
日本
项目状态:
已结题
起止时间:
2001 至 2002
中文摘要
我们在常压下合成了Li_xZrNCl (T_c=15 K)、Li_xNBr (T_c=13 K)和Na_xHfNCl (T_c=20-23 K)等双蜂窝晶格超导体。通过合成大量样品,我们成功地利用中子粉末衍射数据逐一进行Rietveld分析,确定了这些结构参数。结果表明,哈里森近似估计的传递积分与这些化合物的超导转变温度T_c之间有密切的关系。这部分是因为尽管Na_xHfNCl原子质量很大,即晶格坚硬,但它的德拜温度却很大。它基本上表明,最近相邻过渡金属原子之间的键距越长,T_c越高。基于这一发现,我们选择了YOCl、TaON和CeSI作为双蜂窝晶格超导体的高t_c候选者。我们的简单估计预测Na_xYOCl的T_c为30k。我们在dr - lab手套箱中成功合成Li_xYOCl粉末样品后,在湿度小于1ppm的气氛下,我们发现它是一种具有奇怪的磁化温度依赖性的绝缘体。这是首次发现双蜂窝晶格绝缘体。证明了在转移积分相图中,Na_xHfNCl位于绝缘子区域附近。这一结果表明Li_xYOCl样品在压力下可能是高t_c超导体。
英文摘要
We have synthesized double honeycomb lattice superconductors, such as Li_xZrNCl (T_c=15 K), Li_xNBr (T_c=13 K), and Na_xHfNCl (T_c=20-23 K) under ambient pressure. By synthesizing large amount of sample, we have succeeded to determine these structural parameters by Rietveld analysis using neutron powder diffraction data one by one. As a result, we found the close relationship between the transfer integral estimated by Harrison approximation and the superconducting transition temperature T_c in these compounds. This is partially because Na_xHfNCl has large Debye temperature in spite of the large mass of a Hf atom, I.e., stiff lattice. It basically suggests that the longer bond distance between the nearest neighbor transition metal atoms are, the higher T_c is. Based on this finding, we have selected YOCl, TaON, and CeSI as high-T_c candidates of double honeycomb lattice superconductors. Our simple estimation predicts that Na_xYOCl would have a T_c of 30 K. After we successfully sysnthesized Li_xYOCl powder sample in DRI-LAB glove box under an atmosphere of less than 1 ppm moisture, we found it was an insulator with curious temperature dependence of magnetization. This is the first discovery of a double honeycomb lattice insulator. It proves that Na_xHfNCl locates close to an insulator region in our transfer integral phase diagram. This result suggests that Li_xYOCl sample might be a high-T_c superconductor under pressure.
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S.Shamoto: "Double honeycomb lattice superconductors"Recent Research Developments in Physics,Transworld Research Network. 287-304 (2002)
S.Shamoto:“双蜂窝晶格超导体”物理学最新研究进展,Transworld研究网络。
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Y.Miyazaki et al.: "Incommensurate structure of Ca_<1-X>CuO_2"J.Solid State Chem.. 163. 540-545 (2002)
Y.Miyazaki 等:“Ca_<1-X>CuO_2 的不通约结构”J.Solid State Chem.. 163. 540-545 (2002)
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S.Shamoto et al.: "Phonon Density of States of Double Honeycomb Lattice Superconductors Studied by AGNES"Journal of the Physical Society of Japan. 70. 286-288 (2001)
S.Shamoto等人:“AGNES研究的双蜂窝晶格超导体的声子密度”日本物理学会杂志。
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Y.Miyazaki et al.: "Modulated Structure of the Composite Crystal Ca_<0.83>CuO_2"J.Solid State Chem.. 163. 540-545 (2002)
Y.Miyazaki等:“复合晶体Ca_<0.83>CuO_2的调制结构”J.Solid State Chem.. 163. 540-545 (2002)
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S.Shamoto, et al.: "Structures of Layered Superconductor Li_<0.19>ZrNBr and the Parent Compound β-ZrNBr"Journal of the Physical Society of Japan. 70. 283-285 (2001)
S.Shamoto等人:“层状超导体Li_ 0.19 ZrNBr和母体化合物β-ZrNBr的结构”日本物理学会杂志70. 283-285(2001)。
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共 16 条
Elementary excitation measured under a temperature gradient by neutron scattering
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批准号:25287094
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$12.56万
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财政年份:2013
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负责人:SHAMOTO Shin-ichi
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依托单位:
Nanostructures studied by high-Q resolution total scattering spectrometer
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批准号:19310082
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$11.07万
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财政年份:2007
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负责人:SHAMOTO Shin-ichi
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依托单位:
Single Crystal Growth of Double Honeycomb Lattice Superconductor Related Materials
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批准号:15340108
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$10.3万
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财政年份:2003
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负责人:SHAMOTO Shin-ichi
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依托单位:
Exfoliation of a layered high-T_c superconductor
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批准号:11640331
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项目类别:Grant-in-Aid for Scientific Research (C)
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资助金额:$2.24万
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财政年份:1999
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负责人:SHAMOTO Shin-ichi
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依托单位:
海外基金