Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3

Jian Feng Ge; Zhi Long Liu; Canhua Liu; Chun Lei Gao; Dong Qian; Qi Kun Xue; Ying Liu; Jin Feng Jia

doi:10.1038/nmat4153

Superconductivity above 100 K in single-layer FeSe films on doped SrTiO₃

Jian Feng Ge, Zhi Long Liu, Canhua Liu, Chun Lei Gao, Dong Qian, Qi Kun Xue, Ying Liu, Jin Feng Jia

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Abstract

Recent experiments on FeSe films grown on SrTiO₃ (STO) suggest that interface effects can be used as a means to reach superconducting critical temperatures (T_c) of up to 80 K (ref.). This is nearly ten times the T_c of bulk FeSe and higher than the record value of 56 K for known bulk Fe-based superconductors. Together with recent studies of superconductivity at oxide heterostructure interfaces, these results rekindle the long-standing idea that electron pairing at interfaces between two different materials can be tailored to achieve high-temperature superconductivity. Subsequent angle-resolved photoemission spectroscopy measurements of the FeSe/STO system revealed an electronic structure distinct from bulk FeSe (refs,), with an energy gap vanishing at around 65 K. However, ex situ electrical transport measurements have so far detected zero resistance - the key experimental signature of superconductivity - only below 30 K. Here, we report the observation of superconductivity with T_c above 100 K in the FeSe/STO system by means of in situ four-point probe electrical transport measurements. This finding confirms FeSe/STO as an ideal material for studying high-T_c superconductivity.

Original language	English (US)
Pages (from-to)	285-289
Number of pages	5
Journal	Nature Materials
Volume	14
Issue number	3
DOIs	https://doi.org/10.1038/nmat4153
State	Published - Mar 2015

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3",

abstract = "Recent experiments on FeSe films grown on SrTiO3 (STO) suggest that interface effects can be used as a means to reach superconducting critical temperatures (Tc) of up to 80 K (ref.). This is nearly ten times the Tc of bulk FeSe and higher than the record value of 56 K for known bulk Fe-based superconductors. Together with recent studies of superconductivity at oxide heterostructure interfaces, these results rekindle the long-standing idea that electron pairing at interfaces between two different materials can be tailored to achieve high-temperature superconductivity. Subsequent angle-resolved photoemission spectroscopy measurements of the FeSe/STO system revealed an electronic structure distinct from bulk FeSe (refs,), with an energy gap vanishing at around 65 K. However, ex situ electrical transport measurements have so far detected zero resistance - the key experimental signature of superconductivity - only below 30 K. Here, we report the observation of superconductivity with Tc above 100 K in the FeSe/STO system by means of in situ four-point probe electrical transport measurements. This finding confirms FeSe/STO as an ideal material for studying high-Tc superconductivity.",

author = "Ge, {Jian Feng} and Liu, {Zhi Long} and Canhua Liu and Gao, {Chun Lei} and Dong Qian and Xue, {Qi Kun} and Ying Liu and Jia, {Jin Feng}",

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AU - Ge, Jian Feng

AU - Liu, Zhi Long

AU - Liu, Canhua

AU - Gao, Chun Lei

AU - Qian, Dong

AU - Xue, Qi Kun

AU - Liu, Ying

AU - Jia, Jin Feng

PY - 2015/3

Y1 - 2015/3

N2 - Recent experiments on FeSe films grown on SrTiO3 (STO) suggest that interface effects can be used as a means to reach superconducting critical temperatures (Tc) of up to 80 K (ref.). This is nearly ten times the Tc of bulk FeSe and higher than the record value of 56 K for known bulk Fe-based superconductors. Together with recent studies of superconductivity at oxide heterostructure interfaces, these results rekindle the long-standing idea that electron pairing at interfaces between two different materials can be tailored to achieve high-temperature superconductivity. Subsequent angle-resolved photoemission spectroscopy measurements of the FeSe/STO system revealed an electronic structure distinct from bulk FeSe (refs,), with an energy gap vanishing at around 65 K. However, ex situ electrical transport measurements have so far detected zero resistance - the key experimental signature of superconductivity - only below 30 K. Here, we report the observation of superconductivity with Tc above 100 K in the FeSe/STO system by means of in situ four-point probe electrical transport measurements. This finding confirms FeSe/STO as an ideal material for studying high-Tc superconductivity.

AB - Recent experiments on FeSe films grown on SrTiO3 (STO) suggest that interface effects can be used as a means to reach superconducting critical temperatures (Tc) of up to 80 K (ref.). This is nearly ten times the Tc of bulk FeSe and higher than the record value of 56 K for known bulk Fe-based superconductors. Together with recent studies of superconductivity at oxide heterostructure interfaces, these results rekindle the long-standing idea that electron pairing at interfaces between two different materials can be tailored to achieve high-temperature superconductivity. Subsequent angle-resolved photoemission spectroscopy measurements of the FeSe/STO system revealed an electronic structure distinct from bulk FeSe (refs,), with an energy gap vanishing at around 65 K. However, ex situ electrical transport measurements have so far detected zero resistance - the key experimental signature of superconductivity - only below 30 K. Here, we report the observation of superconductivity with Tc above 100 K in the FeSe/STO system by means of in situ four-point probe electrical transport measurements. This finding confirms FeSe/STO as an ideal material for studying high-Tc superconductivity.

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Superconductivity above 100 K in single-layer FeSe films on doped SrTiO₃

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