Origin of the structural phase transition in BaNi2As2 at 130 K: A combined study of optical spectroscopy and band structure calculations

被引：36

作者：

Chen, Z. G. ^{[1
]}

Xu, G. ^{[1
]}

Hu, W. Z. ^{[1
]}

Zhang, X. D. ^{[1
]}

Zheng, P. ^{[1
]}

Chen, G. F. ^{[1
]}

Luo, J. L. ^{[1
]}

Fang, Z. ^{[1
]}

Wang, N. L. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 09期

基金：

美国国家科学基金会;

关键词：

arsenic alloys; band structure; barium alloys; carrier mobility; Fermi surface; nickel alloys; solid-state phase transformations; superconducting materials; superconducting transitions; SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevB.80.094506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

BaNi2As2 exhibits a first-order structural transition at 130 K. Understanding this structural transition is a crucial step toward understanding the electronic properties of the material. We present a combined optical spectroscopy and band structure calculation study on the compound across the transition. The study reveals that BaNi2As2 is a good metal with a rather high plasma frequency. The phase transition leads to a small reduction of conducting carriers. We identify that this reduction is caused by the removal of several small Fermi-surface sheets contributed dominantly from the As-As bonding and Ni-As antibonding.

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页数：5

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