Surface Electrical Conductivity Measurement System with Micro-Four-Point Probes at Sub-Kelvin Temperature under High Magnetic Field in Ultrahigh Vacuum

Yamada, Manabu; Hirahara, Toru; Hobara, Rei; Hasegawa, Shuji; Mizuno, Hiroyuki; Miyatake, Y.; Nagamura, Toshihiko

doi:10.1380/ejssnt.2012.400

Cited by 39 publications

(34 citation statements)

References 32 publications

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“…The sheet resistance R sheet was obtained by the 4PP dc current-voltage measurement by using the dual configuration method. 46 The custom-made STM system for obtaining the atomic image was operated at T = 6 K under UHV better than 2 × 10 −10 Torr. First-principles band-structure calculations for free-standing monolayer NbSe 2 was carried out by using the Quantum Espresso code 47 with generalized gradient approximation.…”

Section: Methodsmentioning

confidence: 99%

Anisotropic band splitting in monolayer NbSe2: implications for superconductivity and charge density wave

et al. 2018

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Realization of unconventional physical properties in two-dimensional (2D) transition-metal dichalcogenides (TMDs) is currently one of the key challenges in condensed-matter systems. However, the electronic properties of 2D TMDs remain largely unexplored compared to those of their bulk counterparts. Here, we report the fabrication of a high-quality monolayer NbSe 2 film with a trigonal prismatic structure by molecular beam epitaxy, and the study of its electronic properties by scanning tunneling microscopy, angleresolved photoemission spectroscopy, and electrical transport measurements, together with first-principles band-structure calculations. In addition to a charge density wave (CDW) with 3 × 3 periodicity and superconductivity below 1.5 K, we observed sizable (~0.1 eV) band splitting along the Γ-K cut in the Brillouin zone due to inversion symmetry breaking in the monolayer crystal. This splitting is highly anisotropic in k space, leading to a spin-split van-Hove singularity in the band structure. The present results suggest the importance of spin-orbit coupling and symmetry breaking for unconventional superconductivity and CDW properties in monolayer TMDs.

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Section: Methodsmentioning

confidence: 99%

Anisotropic band splitting in monolayer NbSe2: implications for superconductivity and charge density wave

et al. 2018

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“…SiC, prepared in the same way as mentioned above in a separate UHV system, using the in-situ four-point probe technique (Unisoku USM-1300S) [21]. As shown in Fig.…”

Section: The Transport Property Was Measured Of the Ca-intercalated Bmentioning

confidence: 99%

Structure of superconducting Ca-intercalated bilayer Graphene/SiC studied using total-reflection high-energy positron diffraction

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Fukaya

Mochizuki

et al. 2020

Carbon

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We have investigated the atomic structure of superconducting Ca-intercalated bilayer graphene on a SiC(0001) substrate using total-reflection high-energy positron diffraction. By comparing the experimental rocking-curves with ones calculated for various structural models using a full-dynamical theory, we have found that Ca atoms are intercalated in the graphene-buffer interlayer, rather than between the two graphene layers.From transport measurements, the superconducting transition was observed to be at Tc onset = 4K for this structure. This study is the first to clearly identify the relation between the atomic arrangement and superconductivity in Ca-intercalated bilayer graphene.

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“…The measurements were performed in situ with our MFPP conductivity measurement system [20] in which the sample and MFPP was cooled down to 0.8 K and a magnetic field as high as 7 T was applied perpendicular to the surface. The probe spacing in MFPP was 20 m [21].…”

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Magnetoresistance Measurements of a Superconducting Surface State of In-Induced and Pb-Induced Structures on Si(111)

2013

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In situ micro-four-point-probe conductivity measurements in ultrahigh vacuum revealed that the Si(111)-striped incommensurate-Pb surface showed the superconductivity transition at 1.1 K. Both of the hexagonal and rectangular phases of Si(111)√[7]×√[3]-In surface showed superconductivity at 2.4 and 2.8 K, respectively. By applying magnetic field perpendicular to the surface, the upper critical field was deduced to be 0.1-1 T. The derived Ginzburg-Landau coherence length of the Cooper pairs was several tens of nm, which was much smaller than the Pippard's coherence length estimated from the band structures. The short coherence length is determined by the carrier mean free path.

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Surface Electrical Conductivity Measurement System with Micro-Four-Point Probes at Sub-Kelvin Temperature under High Magnetic Field in Ultrahigh Vacuum

Cited by 39 publications

References 32 publications

Anisotropic band splitting in monolayer NbSe2: implications for superconductivity and charge density wave

Anisotropic band splitting in monolayer NbSe2: implications for superconductivity and charge density wave

Structure of superconducting Ca-intercalated bilayer Graphene/SiC studied using total-reflection high-energy positron diffraction

Magnetoresistance Measurements of a Superconducting Surface State of In-Induced and Pb-Induced Structures on Si(111)

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