Anti-PbO-type CoSe film: A possible analog to FeSe superconductors

Chong Liu; Fawei Zheng; Lei Shen; Menghan Liao; Rui Wu; Guanming Gong; Cui Ding; Haohao Yang; Wei Li; Can Li Song; Ke He; Xu Cun Ma; Ding Zhang; Lexian Yang; Ping Zhang; Lili Wang; Qi Kun Xue

doi:10.1088/1361-6668/aae146

Anti-PbO-type CoSe film: A possible analog to FeSe superconductors

Chong Liu, Fawei Zheng, Lei Shen, Menghan Liao, Rui Wu, Guanming Gong, Cui Ding, Haohao Yang, Wei Li, Can Li Song, Ke He, Xu Cun Ma, Ding Zhang, Lexian Yang, Ping Zhang, Lili Wang^*, Qi Kun Xue

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Quasi-two-dimensionality is well known as a key electronic and structural element of high temperature superconductivity. Here we prepared ultrathin films of anti-PbO-type CoSe down to the monolayer on a SrTiO₃(001) substrate using molecular beam epitaxy, and investigated their electronic structures by scanning tunneling microscopy, angle-resolved photoemission spectroscopy, and transport measurements in combination with first-principles calculations. We found that the monolayer CoSe had similar band structure and non-ferromagnetism nature with monolayer FeSe on SrTiO₃, except for the Fermi level upshift by ∼0.25 eV and weaker electronic correlation with a renormalization factor of 1.7, due to extra electron filling from Co 3d⁷ compared with Fe 3d⁶. The results hint that superconductivity might emerge in hole-doped tetragonal CoSe films.

Original language	English
Article number	115011
Journal	Superconductor Science and Technology
Volume	31
Issue number	11
DOIs	https://doi.org/10.1088/1361-6668/aae146
Publication status	Published - 15 Oct 2018
Externally published	Yes

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title = "Anti-PbO-type CoSe film: A possible analog to FeSe superconductors",

abstract = "Quasi-two-dimensionality is well known as a key electronic and structural element of high temperature superconductivity. Here we prepared ultrathin films of anti-PbO-type CoSe down to the monolayer on a SrTiO3(001) substrate using molecular beam epitaxy, and investigated their electronic structures by scanning tunneling microscopy, angle-resolved photoemission spectroscopy, and transport measurements in combination with first-principles calculations. We found that the monolayer CoSe had similar band structure and non-ferromagnetism nature with monolayer FeSe on SrTiO3, except for the Fermi level upshift by ∼0.25 eV and weaker electronic correlation with a renormalization factor of 1.7, due to extra electron filling from Co 3d7 compared with Fe 3d6. The results hint that superconductivity might emerge in hole-doped tetragonal CoSe films.",

author = "Chong Liu and Fawei Zheng and Lei Shen and Menghan Liao and Rui Wu and Guanming Gong and Cui Ding and Haohao Yang and Wei Li and Song, {Can Li} and Ke He and Ma, {Xu Cun} and Ding Zhang and Lexian Yang and Ping Zhang and Lili Wang and Xue, {Qi Kun}",

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doi = "10.1088/1361-6668/aae146",

language = "English",

volume = "31",

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TY - JOUR

T1 - Anti-PbO-type CoSe film

T2 - A possible analog to FeSe superconductors

AU - Liu, Chong

AU - Zheng, Fawei

AU - Shen, Lei

AU - Liao, Menghan

AU - Wu, Rui

AU - Gong, Guanming

AU - Ding, Cui

AU - Yang, Haohao

AU - Li, Wei

AU - Song, Can Li

AU - He, Ke

AU - Ma, Xu Cun

AU - Zhang, Ding

AU - Yang, Lexian

AU - Zhang, Ping

AU - Wang, Lili

AU - Xue, Qi Kun

PY - 2018/10/15

Y1 - 2018/10/15

N2 - Quasi-two-dimensionality is well known as a key electronic and structural element of high temperature superconductivity. Here we prepared ultrathin films of anti-PbO-type CoSe down to the monolayer on a SrTiO3(001) substrate using molecular beam epitaxy, and investigated their electronic structures by scanning tunneling microscopy, angle-resolved photoemission spectroscopy, and transport measurements in combination with first-principles calculations. We found that the monolayer CoSe had similar band structure and non-ferromagnetism nature with monolayer FeSe on SrTiO3, except for the Fermi level upshift by ∼0.25 eV and weaker electronic correlation with a renormalization factor of 1.7, due to extra electron filling from Co 3d7 compared with Fe 3d6. The results hint that superconductivity might emerge in hole-doped tetragonal CoSe films.

AB - Quasi-two-dimensionality is well known as a key electronic and structural element of high temperature superconductivity. Here we prepared ultrathin films of anti-PbO-type CoSe down to the monolayer on a SrTiO3(001) substrate using molecular beam epitaxy, and investigated their electronic structures by scanning tunneling microscopy, angle-resolved photoemission spectroscopy, and transport measurements in combination with first-principles calculations. We found that the monolayer CoSe had similar band structure and non-ferromagnetism nature with monolayer FeSe on SrTiO3, except for the Fermi level upshift by ∼0.25 eV and weaker electronic correlation with a renormalization factor of 1.7, due to extra electron filling from Co 3d7 compared with Fe 3d6. The results hint that superconductivity might emerge in hole-doped tetragonal CoSe films.

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U2 - 10.1088/1361-6668/aae146

DO - 10.1088/1361-6668/aae146

M3 - Article

AN - SCOPUS:85055335878

SN - 0953-2048

VL - 31

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 11

M1 - 115011

ER -

Anti-PbO-type CoSe film: A possible analog to FeSe superconductors

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