Structural study on novel two-dimensional superconductor NaxHfNCl

被引：33

作者：

Shamoto, S ^{[1
]}

Iizawa, K

Yamada, M

Ohoyama, K

Yamaguchi, Y

Kajitani, T

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1999年 / 60卷 / 8-9期

关键词：

superconductors; chemical synthesis; neutron scattering; crystal structure;

D O I：

10.1016/S0022-3697(99)00155-9

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The structure of the novel two-dimensional superconductor, NaxHfNCl (x = 0.29, T-c = 20 K) is determined by powder neutron diffraction measurement. NaxHfNCl is isomorphous to Li0.16ZrNCl, which also exhibits superconductivity with T-c = 15 K, The nearest interatomic distance of Hf-Hf (3.24 Angstrom at 4 K) is longer than that of Zr-Zr (3.10 Angstrom at 4 K) in Li0.16ZrNCl. This structural change corresponds to the decrease in the transfer integral of the d bands in the Hf system, i.e. t(Hf)/t(Zr) similar to 0.85, indicating the enhancement of the density of states in NaxHfNCl. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1431 / 1433

页数：3

共 7 条

[1]

Harrison W.A., 1980, Electronic Structure and the Properties of Solids: The Physics of the Chemical Bond

[2]

HASE I, UNPUB PHYS REV B

[3] Superconductivity of alkali metal intercalated beta-zirconium nitride chloride, A(x)ZrNCl (A = Li, Na, K) [J].

Kawaji, H ;

Hotehama, K ;

Yamanaka, S .

CHEMISTRY OF MATERIALS, 1997, 9 (10) :2127-2130

[4]

KIM YI, 1994, J CERAM SOC JPN, V102, P401

[5] Structures of β-ZrNCl and superconducting Li0.16ZrNCl:: double honeycomb lattice superconductor [J].

Shamoto, S ;

Kato, T ;

Ono, Y ;

Miyazaki, Y ;

Ohoyama, K ;

Ohashi, M ;

Yamaguchi, Y ;

Kajitani, T .

PHYSICA C, 1998, 306 (1-2) :7-14

[6] Superconductivity at 25.5 K in electron-doped layered hafnium nitride [J].

Yamanaka, S ;

Hotehama, K ;

Kawaji, H .

NATURE, 1998, 392 (6676) :580-582

[7] A new layer-structured nitride superconductor. Lithium-intercalated beta-zirconium nitride chloride, LixZrNCl [J].

Yamanaka, S ;

Kawaji, H ;

Hotehama, K ;

Ohashi, M .

ADVANCED MATERIALS, 1996, 8 (09) :771-&

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