Optical conductivity of FeTe1-xSex

被引：10

作者：

Mirri, C. ^{[1
,2
]}

Calvani, P. ^{[1
,2
]}

Vitucci, F. M. ^{[1
,2
]}

Perucchi, A. ^{[3
]}

Yeh, K. W. ^{[4
]}

Wu, M. K. ^{[4
]}

Lupi, S. ^{[2
,5
]}

机构：

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

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

[3] Sincrotrone Trieste SCpA, I-34012 Trieste, Italy

[4] Acad Sinica, Inst Phys, Taipei 115, Taiwan

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

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2012年 / 25卷 / 04期

关键词：

ELECTRODYNAMICS; SUPERCONDUCTORS;

D O I：

10.1088/0953-2048/25/4/045002

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The ab-plane optical conductivity of two single crystals belonging to the chalcogenide family, FeTe0.91 and FeTe0.7Se0.3, has been studied in the normal phase between 16 and 450 K. Several differences with respect to both conventional metals and other exotic superconductors, like the cuprates, have been found both in the undoped and in the doped material. In the former compound, the transition to an antiferromagnetic (AF) state at 67 K causes the opening of a pseudogap at omega(0) = 270 +/- 25 cm(-1) and a decrease by 70% in the free carrier density, accompanied by a strong reduction in the carrier scattering rate. The multiband analysis of the low-energy optical conductivity requires at least two Drude components, in addition to a mid-infrared band. Above 350 K, a transfer of spectral weight between those terms produces a cusp anomaly in the spectral weight. This indicates a well-defined transition, rather than a crossover, to a less-metallic regime. Finally, in FeTe0.7Se0.3 the far-infrared conductivity decreases with T, in agreement with the semiconducting behavior of the resistivity, and precursor phenomena of superconductivity appear above T-c.

引用

页数：7

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