Tc Enhancement by Aliovalent Anionic Substitution in Superconducting BaTi2(Sb1-xSnx)2O

被引：16

作者：

Nakano, Kousuke ^{[1
]}

Yajima, Takeshi ^{[1
]}

Takeiri, Fumitaka ^{[1
]}

Green, Mark A. ^{[2
]}

Hester, James ^{[3
]}

Kobayashi, Yoji ^{[1
]}

Kageyama, Hiroshi ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Engn, Dept Energy & Hydrocarbon Chem, Kyoto 6158510, Japan

[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Australian Nucl Sci & Technol Org, Bragg Inst, Menai, NSW 2234, Australia

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 07期

关键词：

superconductivity; BaTi(2)Pn(2)O; CDW/SDW instability; hole doping; d(1) square lattice; mixed anionic coordination; TRANSITION; BA;

D O I：

10.7566/JPSJ.82.074707

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

BaTi2Sb2O is a T-c = 1.2 K superconductor with a d(1) square lattice, and isovalent Bi substitution for Sb can increase its T-c to 4.6 K (BaTi2Bi2O), accompanied by the complete suppression of charge density wave (CDW) or spin density wave (SDW) transition. In the present study, we demonstrate that aliovalent Sn substitution (hole doping) also increases T-c up to 2.5 K for BaTi2(Sb0.7Sn0.3)(2)O, while suppressing CDW/SDW transition only slightly. The overall electronic phase diagram of BaTi2(Sb, Sn)(2)O is qualitatively similar to that of cation-substituted (hole-doped) (Ba,Na)Ti2Sb2O, but quantitative differences such as in T-c are observed, which is discussed in terms of Ti-Pn hybridization and chemical disorder.

引用

页数：5

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