Boosting Superconducting Properties of Fe(Se, Te) via Dual-Oscillation Phenomena Induced by Fluorine Doping

Jixing Liu; Shengnan Zhang; Meng Li; Lina Sang; Zhi Li; Zhenxiang Cheng; Weiyao Zhao; Jianqing Feng; Chengshan Li; Pingxiang Zhang; Shixue Dou; Xiaolin Wang; Lian Zhou

doi:10.1021/acsami.9b02469

Boosting Superconducting Properties of Fe(Se, Te) via Dual-Oscillation Phenomena Induced by Fluorine Doping

Jixing Liu
, Shengnan Zhang
, Meng Li
, Lina Sang
, Zhi Li
, Zhenxiang Cheng
, Weiyao Zhao
, Jianqing Feng
, Chengshan Li
, Pingxiang Zhang
, Shixue Dou
, Xiaolin Wang
, Lian Zhou

Northeastern University China
Northwest Institute for Nonferrous Metal Research
University of Wollongong

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

23 Scopus citations

Abstract

Fluorine-doped Fe(Se, Te) has been successfully synthesized using the melting method. A dual-oscillation effect was found in the F-doped sample, which combined both microstructural oscillation and chemical compositional oscillation. The microstructural oscillation could be attributed to alternate growth of tetragonal β-Fe(Se, Te) and hexagonal δ-Fe(Se, Te), which formed a pearlite-like structure and led to the enhancement of δl flux pinning due to the alternating distributed nonsuperconducting δ-Fe(Se, Te) phase. The chemical compositional oscillations in β-Fe(Se, Te) phase were because of the inhomogeneously distributed Se and Te, which changes the pinning mechanism from surface pinning in the undoped sample to Δκ pinning in the 5% F-doped one. As a result, the critical current, upper critical field, and thermally activated flux-flow activation energy of FeSe_0.45Te_0.5F_0.05 were enhanced by 7, 2, and 3 times, respectively. Our work revealed the physical insights into F-doping resulting in high-performance Fe(Se, Te) superconductors and inspired a new approach to optimize superconductivities in iron-based superconductors through phase and element manipulations.

Original language	English
Pages (from-to)	18825-18832
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	11
Issue number	20
DOIs	https://doi.org/10.1021/acsami.9b02469
State	Published - 22 May 2019
Externally published	Yes

Keywords

Fe(Se, Te)
chemical doping
flux pinning
interface effect
iron-based superconductor
melting process

Access to Document

10.1021/acsami.9b02469

Cite this

@article{219163f3f0b54b5c8c883f8f03f06c45,

title = "Boosting Superconducting Properties of Fe(Se, Te) via Dual-Oscillation Phenomena Induced by Fluorine Doping",

abstract = "Fluorine-doped Fe(Se, Te) has been successfully synthesized using the melting method. A dual-oscillation effect was found in the F-doped sample, which combined both microstructural oscillation and chemical compositional oscillation. The microstructural oscillation could be attributed to alternate growth of tetragonal β-Fe(Se, Te) and hexagonal δ-Fe(Se, Te), which formed a pearlite-like structure and led to the enhancement of δl flux pinning due to the alternating distributed nonsuperconducting δ-Fe(Se, Te) phase. The chemical compositional oscillations in β-Fe(Se, Te) phase were because of the inhomogeneously distributed Se and Te, which changes the pinning mechanism from surface pinning in the undoped sample to Δκ pinning in the 5\% F-doped one. As a result, the critical current, upper critical field, and thermally activated flux-flow activation energy of FeSe0.45Te0.5F0.05 were enhanced by 7, 2, and 3 times, respectively. Our work revealed the physical insights into F-doping resulting in high-performance Fe(Se, Te) superconductors and inspired a new approach to optimize superconductivities in iron-based superconductors through phase and element manipulations.",

keywords = "Fe(Se, Te), chemical doping, flux pinning, interface effect, iron-based superconductor, melting process",

author = "Jixing Liu and Shengnan Zhang and Meng Li and Lina Sang and Zhi Li and Zhenxiang Cheng and Weiyao Zhao and Jianqing Feng and Chengshan Li and Pingxiang Zhang and Shixue Dou and Xiaolin Wang and Lian Zhou",

note = "Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

year = "2019",

month = may,

day = "22",

doi = "10.1021/acsami.9b02469",

language = "英语",

volume = "11",

pages = "18825--18832",

journal = "ACS Applied Materials and Interfaces",

issn = "1944-8244",

publisher = "American Chemical Society",

number = "20",

}

TY - JOUR

T1 - Boosting Superconducting Properties of Fe(Se, Te) via Dual-Oscillation Phenomena Induced by Fluorine Doping

AU - Liu, Jixing

AU - Zhang, Shengnan

AU - Li, Meng

AU - Sang, Lina

AU - Li, Zhi

AU - Cheng, Zhenxiang

AU - Zhao, Weiyao

AU - Feng, Jianqing

AU - Li, Chengshan

AU - Zhang, Pingxiang

AU - Dou, Shixue

AU - Wang, Xiaolin

AU - Zhou, Lian

PY - 2019/5/22

Y1 - 2019/5/22

N2 - Fluorine-doped Fe(Se, Te) has been successfully synthesized using the melting method. A dual-oscillation effect was found in the F-doped sample, which combined both microstructural oscillation and chemical compositional oscillation. The microstructural oscillation could be attributed to alternate growth of tetragonal β-Fe(Se, Te) and hexagonal δ-Fe(Se, Te), which formed a pearlite-like structure and led to the enhancement of δl flux pinning due to the alternating distributed nonsuperconducting δ-Fe(Se, Te) phase. The chemical compositional oscillations in β-Fe(Se, Te) phase were because of the inhomogeneously distributed Se and Te, which changes the pinning mechanism from surface pinning in the undoped sample to Δκ pinning in the 5% F-doped one. As a result, the critical current, upper critical field, and thermally activated flux-flow activation energy of FeSe0.45Te0.5F0.05 were enhanced by 7, 2, and 3 times, respectively. Our work revealed the physical insights into F-doping resulting in high-performance Fe(Se, Te) superconductors and inspired a new approach to optimize superconductivities in iron-based superconductors through phase and element manipulations.

AB - Fluorine-doped Fe(Se, Te) has been successfully synthesized using the melting method. A dual-oscillation effect was found in the F-doped sample, which combined both microstructural oscillation and chemical compositional oscillation. The microstructural oscillation could be attributed to alternate growth of tetragonal β-Fe(Se, Te) and hexagonal δ-Fe(Se, Te), which formed a pearlite-like structure and led to the enhancement of δl flux pinning due to the alternating distributed nonsuperconducting δ-Fe(Se, Te) phase. The chemical compositional oscillations in β-Fe(Se, Te) phase were because of the inhomogeneously distributed Se and Te, which changes the pinning mechanism from surface pinning in the undoped sample to Δκ pinning in the 5% F-doped one. As a result, the critical current, upper critical field, and thermally activated flux-flow activation energy of FeSe0.45Te0.5F0.05 were enhanced by 7, 2, and 3 times, respectively. Our work revealed the physical insights into F-doping resulting in high-performance Fe(Se, Te) superconductors and inspired a new approach to optimize superconductivities in iron-based superconductors through phase and element manipulations.

KW - Fe(Se, Te)

KW - chemical doping

KW - flux pinning

KW - interface effect

KW - iron-based superconductor

KW - melting process

UR - https://www.scopus.com/pages/publications/85065875060

U2 - 10.1021/acsami.9b02469

DO - 10.1021/acsami.9b02469

M3 - 文章

C2 - 31007006

AN - SCOPUS:85065875060

SN - 1944-8244

VL - 11

SP - 18825

EP - 18832

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 20

ER -

Boosting Superconducting Properties of Fe(Se, Te) via Dual-Oscillation Phenomena Induced by Fluorine Doping

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this