Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

Kaminaga, Kenichi; Oka, Daichi; Hasegawa, Tetsuya; Fukumura, Tomoteru

doi:10.1021/jacs.8b03009

Cited by 48 publications

(55 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, YO is a narrow gap semiconductor, 9 SmO is a heavy fermionic metal, 10 and LaO is a superconductor. 11 In this study, we report the first synthesis of rock-salt type LuO epitaxial thin films with unusual valence of Lu 2+ (Lu 2+ : [Xe]4f 14 5d 1 ). In stark contrast with high- k insulator Lu 2 O 3 , 2−4 LuO exhibited a narrow band gap and high electrical conduction with a strong spin–orbit interaction originating from its 5d electron carriers.…”

Section: Introductionmentioning

confidence: 99%

New Lutetium Oxide: Electrically Conducting Rock-Salt LuO Epitaxial Thin Film

et al. 2018

Self Cite

View full text Add to dashboard Cite

C-rare earth structure lutetium sesquioxide Lu 2 O 3 has been recognized as a high- k widegap insulator with closed shell Lu 3+ ions. In this study, rock-salt structure lutetium monoxide LuO with unusual valence of Lu 2+ (4f 14 5d 1 ), previously known as the gaseous phase, was synthesized as an epitaxial thin film by the pulsed laser deposition method. In contrast with transparent and highly insulating Lu 2 O 3 , LuO possessed a dark-brown color and high electrical conductivity concomitant with strong spin–orbit coupling as a manifestation of Lu 5d electron carriers.

show abstract

Section: Introductionmentioning

confidence: 99%

New Lutetium Oxide: Electrically Conducting Rock-Salt LuO Epitaxial Thin Film

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because of the low work function of LaO, the amount of electrons transferred from LaO to FeSe is even larger than that from STO. In consideration of the fact that the rock-salt structure LaO itself was also reported to be a superconductor (T c ∼ 5 K) 59 , our results suggest that FeSe/LaO might be another interesting platform to study interfacial superconductivity in addition to FeSe/STO.…”

Section: Discussion and Summarymentioning

confidence: 82%

“…A Previous experiment demonstrated that the LaO(001) film deposited on the YAlO 3 (110) surface has a tetragonally distorted rock-salt structure with the lattice constants of a = b = 5.198Å and c = 5.295Å [Fig. 1(a)] 59 . These experimental values were adopted for the bulk part of LaO(001) substrate in our calcula- To find out the most stable epitaxial structure, we studied four possible adsorption sites for FeSe monolayer on LaO(001) surface.…”

Section: Results and Analysismentioning

confidence: 99%

“…This may result in different electron-phonon interactions between the FeSe electrons and the substrate phonons, thus offering an opportunity to examine the role of interfacial phonon. Last but not least, the rock-salt structure LaO was also reported to be a superconductor with T c ∼ 5 K 59 . Hence the FeSe/LaO interfacial system might be an interesting platform for studying the superconducting proximity effect between LaO and FeSe.…”

Section: Discussion and Summarymentioning

confidence: 99%

“…In order to investigate the interfacial superconductivity more comprehensively, it is important to find out new substrates for the epitaxial growth of FeSe film to make a comparison with FeSe/STO 53,54 59 . Notably, the in-plane lattice constant of LaO film (5.198Å) 59 matches well with that of bulk FeSe ( √ 2a 0 = 5.325Å) 6 . As LaO has extra electrons with the usual valences of La 3+ and O 2− , it is prone to transfer electrons to the epitaxial film grown on it.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

LaO as a candidate substrate for realizing superconductivity in an FeSe epitaxial film

et al. 2021

View full text Add to dashboard Cite

The significantly enhanced superconducting transition temperature (Tc) of an FeSe monolayer on SrTiO3(001) substrate has attracted extensive attention in recent years. Here, based on firstprinciples electronic structure calculations, we propose another candidate substrate LaO(001) for the epitaxial growth of FeSe monolayer to realize superconductivity. Our calculations show that for the optimal adsorption structure of FeSe monolayer on LaO(001), the stripe antiferromagnetic state and the dimer antiferromagnetic state are almost energetically degenerate, indicating the existence of strong magnetic fluctuation that is beneficial to the appearance of superconductivity. According to the Bader charge analysis, the calculated electron doping from the LaO substrate to the FeSe monolayer is about 0.18 electrons per Fe atom, even larger than that in case of FeSe/SrTiO3(001). Since LaO was also reported to be a superconductor with Tc ∼ 5 K, it may have a superconducting proximity effect on the epitaxial FeSe film and vice versa. These results suggest that LaO would be an interesting substrate to study the interface-related superconductivity.

show abstract

Direct Growth of Nanopatterned Graphene on Sapphire and Its Application in Light Emitting Diodes

Chen

Chang

Cheng

et al. 2020

Adv Funct Materials

View full text Add to dashboard Cite

Direct growth of graphene films on functional substrates is immensely beneficial for the large‐scale applications of graphene by avoiding the transfer‐induced issues. Notably, the selective growth of patterned graphene will further boost the development of graphene‐based devices. Here, the direct growth of patterned graphene on the c‐plane of nanopatterned sapphire substrate (NPSS) is realized and the superiority of the patterned graphene for high‐performance ultraviolet light‐emitting diodes (UV‐LED) is demonstrated. As confirmed by density functional theory calculations and analog simulations, compared to the concave r‐plane the flat c‐plane of NPSS is characterized by a lower active barrier for methane decomposition and carbon species diffusion, as well as a greater supply of carbon precursor for graphene growth. The synthesized patterned graphene on the c‐plane of NPSS is verified to be monolayer and high quality. The patterned graphene enables the selective and well‐aligned nucleation of aluminium nitride (AlN) to promote rapid epitaxial lateral overgrowth of single‐crystal AlN films with low dislocation density. Consequently, the fabricated UV‐LED demonstrates high luminescence intensity and stability. The method is suitable for obtaining various patterned graphene by substrate design, which will allow for greater progress in the cutting‐edge applications of graphene.

show abstract

Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

Cited by 48 publications

References 23 publications

New Lutetium Oxide: Electrically Conducting Rock-Salt LuO Epitaxial Thin Film

New Lutetium Oxide: Electrically Conducting Rock-Salt LuO Epitaxial Thin Film

LaO as a candidate substrate for realizing superconductivity in an FeSe epitaxial film

Direct Growth of Nanopatterned Graphene on Sapphire and Its Application in Light Emitting Diodes

Contact Info

Product

Resources

About