Electrical Transport
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2021 ◽  
Author(s):  
Yejin Lee ◽  
Omkaram Inturu ◽  
Jin Hee Kim ◽  
Jong-Soo Rhyee

Abstract We synthesize Weyl semimetal/superconductor NbP/NbSe2 composite and observe stable bulk superconductivity at Tc = 7.2 K, 6.9 K, and 6.8 K for NbSe2 crystal, NbP/NbSe2 (1:1), and NbP/NbSe2 (2:1) composites, respectively, despite large volume fraction of non-superconducting NbP phase. From the Ginzburg-Landau theory, the Hc2(0) is significantly enhanced in NbP/NbSe2 composites [22 T (1:1) and 18.5 T (2:1)] comparing with the pristine NbSe2 crystal (8 T). The bulk superconductivity in Weyl semimetal/superconductor composite cannot be simply described by the de Gennes-Meissner theory in a proximity effect. From the electrical transport, magnetization, and heat capacity measurement, we obtain various superconducting parameters. The superconducting properties indicate that the NbP/NbSe2 composite is far from the conventional BCS superconductivity. It suggests that the Weyl semimetal/superconductor composite can have giant proximity effect, resulting in the stable bulk superconductivity in a composite with sizable volume fraction of non-superconducting Weyl semimetals. The giant proximity effect in Weyl semimetal/superconductor interface can have a platform to investigate the proximity induced Weyl semimetallic superconducting states.


2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Mingjia Yao ◽  
Yuxiang Wang ◽  
Xin Li ◽  
Ye Sheng ◽  
Haiyang Huo ◽  
...  

AbstractSince the proposal of the “Materials Genome Initiative”, several material databases have emerged and advanced many materials fields. In this work, we present the Materials Informatics Platform with Three-Dimensional Structures (MIP-3d). More than 80,000 structural entries, mainly from the inorganic crystal structural database, are included in MIP-3d. Density functional theory calculations are carried out for over 30,000 entries in the database, which contain the relaxed crystal structures, density of states, and band structures. The calculation of the equations of state and sound velocities is performed for over 12,000 entries. Notably, for entries with band gap values larger than 0.3 eV, the band degeneracies for the valence band maxima and the conduction band minima are analysed. The electrical transport properties for approximately 4,400 entries are also calculated and presented in MIP-3d under the constant electron-phonon coupling approximation. The calculations of the band degeneracies and electrical transport properties make MIP-3d a database specifically designed for thermoelectric applications.


Author(s):  
Pratik Lakhani ◽  
Minal Unadkat ◽  
Pankaj Solanki ◽  
J.H. Markana ◽  
Mukesh Ranjan ◽  
...  

2021 ◽  
Vol 18 (2) ◽  
pp. 17-36
Author(s):  
Fatin Farhana Awang ◽  
◽  
Mohd Faiz Hassan ◽  
Kok Sheng Chan ◽  
Khadijah Hilmun Kamarudin ◽  
...  

In this work, different amounts of sodium bisulfite, NaHSO3 (5wt.% to 40wt.%), were dissolved in a corn starch polymer host to synthesize solid polymer electrolyte (SPE) using a solution casting technique. Then, the films prepared were characterised using non-destructive electrical impedance spectroscopy to determine SPE films' conductivity and electrical transport properties. The highest conductivity of the sample at ambient temperature was recorded at 15wt. % of NaHSO3 with a value of 2.22 × 10-4 Scm-1. Moreover, the ion transport parameters at room temperature are found to be 2.41 × 10-7 cm2s-1, 9.39 × 10-6 cm2V-1s-1, 1.70 × 1019 cm-3 for D, µ and n, respectively. The conductivity of the samples was found dependent on diffusion coefficient, D and mobility, µ of ions.


2021 ◽  
Vol 5 ◽  
pp. 100106
Author(s):  
Shubhendra Kumar Jain ◽  
Pratibha Goel ◽  
Urvashi Varshney ◽  
Tushar Garg ◽  
Neha Aggarwal ◽  
...  

2021 ◽  
Author(s):  
Bhaskar Ghawri ◽  
Phanibhusan Mahapatra ◽  
Manjari Garg ◽  
Shinjan Mandal ◽  
Saisab Bhowmik ◽  
...  

Abstract The planar assembly of twisted bilayer graphene (tBLG) hosts a multitude of interaction-driven phases when the relative rotation is close to the magic angle (θ = 1.1°). This includes correlation-induced ground states that reveal spontaneous symmetry breaking at low temperature, as well as the possibility of non-Fermi liquid (NFL) excitations. However, experimentally, the manifestation of NFL effects in transport properties of twisted bilayer graphene remains ambiguous. Here we report simultaneous measurements of electrical resistivity (ρ) and thermoelectric power (S) in tBLG for several twist angles between θ ≈ 1.0°-1.7°. We observe an emergent violation of the semiclassical Mott relation in the form of excess S close to half-filling for θ≈1.6° that vanishes for ≥ 2°. The excess S (≈2 μV/K at low temperatures T ≈10 K at θ≈1.6°) persists up to ≈ 40 K and is accompanied by metallic T-linear ρ with transport scattering rate (1/τ) of near-Planckian magnitude 1/τ ≈ k_BT/h_bar. Closer to θ_m, the excess S was also observed for fractional band-filling (ν≈ 0.5). The combination of non-trivial electrical transport and violation of Mott relation provides compelling evidence of NFL physics intrinsic to tBLG.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
João Resende ◽  
Van-Son Nguyen ◽  
Claudia Fleischmann ◽  
Lorenzo Bottiglieri ◽  
Stéphane Brochen ◽  
...  

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