Infrared spectroscopy study of ironbased superconductor Li0.8Fe0.2 ODFeSe

Lin Tong; Hu Die; Shi Li-Yu; Zhang Si-Jie; Liu Yan-Qi; Lv Jia-Lin; Dong Tao; Zhao Jun; Wang Nan-Lin

doi:10.7498/aps.67.20181401

Abstract

We perform an in-plane optical spectroscopy measurement on iron-based superconductor Li0.8Fe0.2ODFeSe single crystal. At room temperature, the low frequency optical conductivity shows an incoherent characteristic; the Drude component is absent. With temperature decreasing, the Drude component develops and narrows rapidly. A well-defined plasma edge is observed in reflectance spectrum at temperature below 100 K, indicating a dramatically reduced scattering rate. The spectral weight contributed from free carriers is even smaller than that of FeSe single crystal. A number of phonon modes are visible in the measured spectra. We also observe clear spectral change below 160 cm-1 at 10 K, associated with the formation of superconducting energy gap in the superconducting state. The energy scale of the superconducting gap is comparable to the value measured by angle-resolved photoemission spectroscopy technique. Like FeSe and other iron pnictides, a clear temperature-induced spectral weight transfer at high energy is observed for Li0.8Fe0.2ODFeSe, indicating the presence of strong correlation effect.

Keywords:

Authors and contacts

1.
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;
2.
State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China

Corresponding author: Wang Nan-Lin, nlwang@pku.edu.cn

Funds: Project supported by the National Basic Research Program of China (Grant Nos. 2016YFA0300902, 2016YFA0300203, 2017YFA0302904, 2015CB921302), the National Natural Science Foundation of China (Grant Nos. 11327806, GZ1123), and the Innovation Program of Shanghai Municipal Education Commission, China (Grant No. 2017-01-07-00-07-E00018).

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Cited By

[1]	Rotter M, Tegel M, Johrendt D 2008 Phys. Rev. Lett. 101 107006
[2]	Kuroki K, Onari S, Arita R, Usui H, Tanaka Y, Kontani H, Aoki H 2008 Phys. Rev. Lett. 101 087004
[3]	Guo J G, Jin S F, Wang G, Wang S C, Zhu K X, Zhou T T, He M, Chen X L 2010 Phys. Rev. B 82 180520
[4]	Margadonna S, Takabayashi Y, Ohishi Y, Mizuguchi Y, Takano Y, Kagayama T, Nakagawa T, Takata M, Prassides K 2009 Phys. Rev. B 80 064506
[5]	Wang H P, Ye Z R, Zhang Y, Wang N L 2016 Sci. Bull. 61 1126
[6]	Liu D F, Zhang W H, Mou D X, He J F, Ou Y B, Wang Q Y, Li Z, Wang L L, Zhao L, He S L, Peng Y Y, Liu X, Chen C Y, Yu L, Liu G D, Dong X L, Zhang J, Chen C T, Xu Z Y, Hu J P, Chen X, Ma X C, Xue Q K, Zhou X J 2012 Nat. Commun. 3 931
[7]	He S L, He J F, Zhang W H, Zhao L, Liu D F, Liu X, Mou D X, Ou Y B, Wang Q Y, Li Z, Wang L L, Peng Y Y, Liu Y, Chen C Y, Yu L, Liu G D, Dong X L, Zhang J, Chen C T, Xu Z Y, Chen X, Ma X C, Xue Q K, Zhou X J 2013 Nat. Mater. 12 605
[8]	Tan S Y, Zhang Y, Xia M, Ye Z Y, Chen F, Xie X, Peng R, Xu D F, Fan Q, Xu H C, Jiang J, Zhang T, Lai X C, Xiang T, Hu J P, Xie B P, Feng D L 2013 Nat. Mater. 12 634
[9]	Zhang Z C, Wang Y H, Song Q, Liu C, Peng R, Moler K A, Feng D L, Wang Y Y 2015 Sci. Bull. 60 1301
[10]	Lu X F, Wang N Z, Wu H, Wu Y P, Zhao D, Zeng X Z, Luo X G, Wu T, Bao W, Zhang G H, Huang F Q, Huang Q Z, Chen X H 2015 Nat. Mater. 14 325
[11]	Dong X L, Jin K, Yuan D N, Zhou H X, Yuan J, Huang Y L, Hua W, Sun J L, Zheng P, Hu W, Mao Y Y, Ma M W, Zhang G M, Zhou F, Zhao Z X 2015 Phys. Rev. B 92 064515
[12]	Niu X H, Peng R, Xu H C, Yan Y J, Jiang J, Xu D F, Yu T L, Song Q, Huang Z C, Wang Y X, Xie B P, Lu X F, Wang N Z, Chen X H, Sun Z, Feng D L 2015 Phys. Rev. B 92 060504
[13]	Yan Y J, Zhang W H, Ren M Q, Liu X, Lu X F, Wang N Z, Niu X H, Fan Q, Miao J, Tao R, Xie B P, Chen X H, Zhang T, Feng D L 2016 Phys. Rev. B 94 134502
[14]	Zhao L, Liang A J, Yuan D N, Hu Y, Liu D F, Huang J W, He S L, Shen B, Xu Y, Liu X, Yu L, Liu G D, Zhou H X, Huang Y L, Dong X L, Zhou F, Liu K, Lu Z Y, Zhao Z X, Chen C T, Xu Z Y, Zhou X J 2016 Nat. Commun. 7 10608
[15]	Pan B Y, Shen Y, Hu D, Feng Y, Park J T, Christianson A D, Wang Q S, Hao Y Q, Wo H L, Yin Z P, Maier T A, Zhao J 2017 Nat. Commun. 8 123
[16]	Tanner D B 2015 Phys. Rev. B 91 035123
[17]	Li G, Hu W Z, Dong J, Li Z, Zheng P, Chen G F, Luo J L, Wang N L 2008 Phys. Rev. Lett. 101 107004
[18]	Yuan R H, Kong W D, Yan L, Ding H, Wang N L 2013 Phys. Rev. B 87 144517
[19]	Hu W Z, Dong J, Li G, Li Z, Zheng P, Chen G F, Luo J L, Wang N L 2008 Phys. Rev. Lett. 101 257005
[20]	Hu W Z, Li G, Zheng P, Chen G F, Luo J L, Wang N L 2009 Phys. Rev. B 80 100507
[21]	Wang N L, Hu W Z, Chen Z G, Yuan R H, Li G, Chen G F, Xiang T 2012 J. Phys.: Condens. Matter 24 294202
[22]	Benfatto L, Cappelluti E, Ortenzi L, Boeri L 2009 Nat. Phys. 5 647
[23]	Qazilbash M M, Hamlin J J, Baumbach R E, Zhang L J, Singh D J, Maple M B, Basov D N 2009 Nat. Phys. 5 647

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Vol. 67, Issue 20 - 2018-10-20

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