Electrodynamics of BaFe2As2 from infrared measurements under pressure

被引：10

作者：

Baldassarre, L. ^{[1
]}

Perucchi, A. ^{[1
]}

Postorino, P. ^{[2
,3
]}

Lupi, S. ^{[1
,2
,3
]}

Marini, C. ^{[2
,3
,4
]}

Malavasi, L. ^{[5
,6
]}

Jiang, J. ^{[7
]}

Weiss, J. D. ^{[7
]}

Hellstrom, E. E. ^{[7
]}

Pallecchi, I. ^{[8
]}

Dore, P. ^{[3
,9
]}

机构：

[1] Sincrotrone Trieste, I-34012 Trieste, Italy

[2] Univ Roma Sapienza, CNR IOM, I-00185 Rome, Italy

[3] Univ Roma Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[4] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[5] Univ Pavia, IENI CNR, I-27100 Pavia, Italy

[6] Univ Pavia, INSTM UdR Pavia, Dipartimento Chim Fis M Rolla, I-27100 Pavia, Italy

[7] Florida State Univ, Natl High Magnet Field Lab, Ctr Appl Superconduct, Tallahassee, FL 32310 USA

[8] CNR SPIN, I-16152 Genoa, Italy

[9] Univ Roma Sapienza, CNR SPIN, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 17期

基金：

美国国家科学基金会;

关键词：

SUPERCONDUCTIVITY; BEAMLINE; SISSI;

D O I：

10.1103/PhysRevB.85.174522

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on an infrared study on the undoped compound BaFe2As2 as a function of pressure (up to about 10 GPa) at three temperatures (300, 160, and 110 K). The evolution with pressure and temperature of the optical conductivity shows that by increasing pressure, the mid-infrared absorptions associated with magnetic order are lowered while the Drude term increases, indicating the evolution towards a conventional metallic state. We evaluate the spectral weight dependence on pressure comparing it to that previously found upon doping. All the optical results indicate that lattice modifications cannot be recognized as the only parameter determining the low-energy electrodynamics in these compounds.

引用

页数：6

共 41 条

[1] Electronic phase diagram of the iron-based high-Tc superconductor Ba(Fe1-xCox)2As2 under hydrostatic pressure (0<x<0.099) [J].