Existence of Orbital Order and its Fluctuation in Superconducting Ba(Fe1-xCox)2As2 Single Crystals Revealed by X-ray Absorption Spectroscopy

被引：47

作者：

Kim, Y. K. ^{[1
]}

Jung, W. S. ^{[1
]}

Han, G. R. ^{[1
]}

Choi, K-Y. ^{[2
]}

Kim, K-H. ^{[2
]}

Chen, C-C. ^{[3
,4
]}

Devereaux, T. P. ^{[3
]}

Chainani, A. ^{[5
]}

Miyawaki, J. ^{[5
]}

Takata, Y. ^{[5
]}

Tanaka, Y. ^{[5
]}

Oura, M. ^{[5
]}

Shin, S. ^{[5
,6
]}

Singh, A. P. ^{[7
]}

Lee, H. G. ^{[7
]}

Kim, J-Y. ^{[7
]}

Kim, C. ^{[1
]}

机构：

[1] Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea

[2] Seoul Natl Univ, Dept Phys & Astron, CeNSCMR, Seoul 151747, South Korea

[3] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[4] Argonne Natl Lab, Adv Photon Source, Lemont, IL 60439 USA

[5] RIKEN SPring 8 Ctr, Sayo, Hyogo 6795148, Japan

[6] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[7] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Pohang 790784, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 21期

关键词：

IRON; TRANSITION; ANISOTROPY; BAFE2AS2; STATE;

D O I：

10.1103/PhysRevLett.111.217001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We performed temperature dependent x-ray linear dichroism (XLD) experiments on an iron pnictide system, Ba(Fe1-xCox)(2)As-2 with x = 0.00, 0.05, 0.08, and 0.10 to experimentally verify the existence of orbital ordering (OO). Substantial XLD was observed in polarization dependent x-ray absorption spectra of Fe L edges. By exploiting the difference in the temperature dependent behaviors, OO, and structure contributions to XLD could be clearly separated. The observed OO signal indicates different occupation numbers for d(yz) and d(zx) orbitals and supports the existence of ferro-OO. The results are also consistent with the theoretical prediction. Moreover, we find substantial OO signal well above the structural and magnetic transition temperatures, which suggests the existence of strong OO fluctuations up to high temperatures.

引用

页数：5

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