New layered nickel arsenides (Ni2As2)(Ba3Sc2O5), (Ni2As2)(Ba4Sc2O6) and (Ni2As2)(Ba4Sc3O8)

被引：1

作者：

Machida, Kenji ^{[1
]}

Ogino, Hiraku ^{[1
]}

Yamamoto, Akiyasu ^{[1
]}

Kishio, Kohji ^{[1
]}

Shimoyama, Jun-ichi ^{[1
]}

机构：

[1] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, Tokyo To 1138656, Japan

来源：

SUPERCONDUCTIVITY CENTENNIAL CONFERENCE 2011 | 2012年 / 36卷

关键词：

Superconductivity; layered nickel pnictides; perovskite; CRYSTAL-STRUCTURE; SUPERCONDUCTOR;

D O I：

10.1016/j.phpro.2012.06.275

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We have discovered three new layered nickel pnictides with perovskite-type layer, (Ni2As2)(Ba3Sc2O5), (Ni2As2)(Ba4Sc2O6) and (Ni2As2)(Ba4Sc3O8). They have tetragonal crystal structures with space groups of I4/mmm for (Ni2As2)(Ba3Sc2O5) and (Ni2As2)(Ba4Sc3O8), and P4/nmm for (Ni2As2)(Ba4Sc2O6). Their lattice constants were a = 4.158 angstrom and c = 27.51 angstrom for (Ni2As2)(Ba3Sc2O5), a = 4.150 angstrom and c = 16.42 angstrom for (Ni2As2)(Ba4Sc2O6), and a = 4.15 angstrom and c = 37.0 angstrom for (Ni2As2)(Ba4Sc3O8). (Ni2As2)(Ba3Sc2O5) and (Ni2As2)(Ba4Sc2O6) exhibited bulk superconductivity with T-c(onset)'s of 4.4 K and 3.5 K, respectively. T-c of (Ni2As2)(Ba3Sc2O5) is the highest among the layered nickel pnictide superconductors. Their relatively high T-c may originate from their long a-axis. (C) 2012 Published by Elsevier B. V. Selection and/or peer-review under responsibility of the Guest Editors.

引用

页码：727 / 730

页数：4

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