TY - JOUR
T1 - Enhancement of superconducting transition temperature in FeSe electric-double-layer transistor with multivalent ionic liquids
AU - Miyakawa, Tomoki
AU - Shiogai, Junichi
AU - Shimizu, Sunao
AU - Matsumoto, Michio
AU - Ito, Yukihiro
AU - Harada, Takayuki
AU - Fujiwara, Kohei
AU - Nojima, Tsutomu
AU - Itoh, Yoshimitsu
AU - Aida, Takuzo
AU - Iwasa, Yoshihiro
AU - Tsukazaki, Atsushi
N1 - Funding Information:
This work was partly supported by a JSPS Grant-in-Aid for Specially Promoted Research on “Emergent Iontronics” (Grant No. 25000003), a JSPS Grant-in-Aid for Specially Promoted Research on “Physically Perturbed Assembly for Tailoring High-Performance Soft Materials with Controlled Macroscopic Structural Anisotropy” (Grant No. 25000005), a Grant-in-Aid for Young Scientists (B) (Grant No. JP26820298), a Grant-in-Aid for Scientific Research on Innovative Areas (Grant No. JP16H00923), a Grant-in-Aid for Scientific Research (B) (Grant No. JP17H02928), a Grant-in-Aid for Challenging Exploratory Research (Grant No. JP15K13354), and a Grant-in-Aid for Young Scientists (A) (Grant No. JP16H05981).
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/3/26
Y1 - 2018/3/26
N2 - We report on an enhancement of the superconducting transition temperature (Tc) of the FeSe-based electric-double-layer transistor (FeSe-EDLT) by applying the multivalent oligomeric ionic liquids (ILs). The IL composed of dimeric cation (divalent IL) enables a large amount of charge accumulation on the surface of the FeSe ultrathin film, resulting in inducing electron-rich conduction even in a rather thick 10 nm FeSe channel. The onset Tc in FeSe-EDLT with the divalent IL is enhanced to be approaching about 50 K at the thin limit, which is about 7 K higher than that in EDLT with conventional monovalent ILs. The enhancement of Tc is a pronounced effect of the application of the divalent IL, in addition to the large capacitance, supposing preferable interface formation of ILs driven by geometric and/or Coulombic effect. The present finding strongly indicates that multivalent ILs are powerful tools for controlling and improving physical properties of materials.
AB - We report on an enhancement of the superconducting transition temperature (Tc) of the FeSe-based electric-double-layer transistor (FeSe-EDLT) by applying the multivalent oligomeric ionic liquids (ILs). The IL composed of dimeric cation (divalent IL) enables a large amount of charge accumulation on the surface of the FeSe ultrathin film, resulting in inducing electron-rich conduction even in a rather thick 10 nm FeSe channel. The onset Tc in FeSe-EDLT with the divalent IL is enhanced to be approaching about 50 K at the thin limit, which is about 7 K higher than that in EDLT with conventional monovalent ILs. The enhancement of Tc is a pronounced effect of the application of the divalent IL, in addition to the large capacitance, supposing preferable interface formation of ILs driven by geometric and/or Coulombic effect. The present finding strongly indicates that multivalent ILs are powerful tools for controlling and improving physical properties of materials.
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U2 - 10.1103/PhysRevMaterials.2.031801
DO - 10.1103/PhysRevMaterials.2.031801
M3 - Article
AN - SCOPUS:85059578982
SN - 2475-9953
VL - 2
JO - Physical Review Materials
JF - Physical Review Materials
IS - 3
M1 - 031801
ER -