arXiv subjects

Jagadis Prasad Nayak

Publications and source records attributed to Jagadis Prasad Nayak.

3 recordsLinked to original sources

arXiv2026

Low-frequency noise as a probe of microscopic disorder in CVD-grown graphene

We report a detailed investigation of low-frequency resistance fluctuations (1/f noise) in chemical vapor deposition (CVD) grown graphene. Systematic measurements reveal that the magnitude of 1/f noise in CVD-grown graphene is significantly higher by several orders of magnitude than that typically observed in exfoliated single-crystal graphene. This enhancement is attributed to structural imperfections such as grain boundaries and defect states within the polycrystalline film. Detailed analysis of the temperature dependence of the noise demonstrates that the resistance fluctuations arise from thermally activated dynamics of localized defects. These results provide key insights into the microscopic mechanism of noise in scalable graphene films and highlight the role of defect engineering in optimizing graphene for large-scale electronic applications. Our findings establish low-frequency noise as a sensitive probe of microscopic disorder in CVD graphene, providing a practical pathway for assessing material quality in scalable electronic technologies.

cond-mat.mes-hall↗

arXiv2026

Conductance Oscillations in a Topological Insulator-Disordered Superconductor Hybrid Interface

We report on the observation on proximity-induced superconductivity in the topological insulator BiSbTeSe2 coupled to a disordered superconductor, amorphous indium oxide (a-InO). Resistance temperature measurements reveal superconducting signatures at low temperatures, even when InO is in an insulating state, indicating the persistence of superconducting correlations. Differential conductance spectra reveal nearly periodic oscillations at higher bias, together with a pronounced zero-bias conductance peak. Both effect disappears at high temperature, marking the critical temperature (T*) of the superconducting islands in InO. These results underscore the influence of topological surface states on proximity-induced superconductivity and highlight the role of superconducting fluctuations in disordered superconductor/topological-insulator hybrid interfaces.

cond-mat.mes-hall↗

arXiv2025

Exploring the Electronic Nature of Spinel Oxides: A Review of Their Electron Interactions and Prospects

This review discusses the multifaceted electronic properties of spinel oxides with a particular focus on Lithium Vanadate (LiV2O4), Lithium Titanate (LiTi2O4), and Magnesium Titanate (MgTi2O4). We selected LiTi2O4, LiV2O4, and MgTi2O4 because they serve as quintessential examples of spinel oxides' diverse and intriguing electronic phenomena. LiV2O4 heavy fermion behaviour challenges traditional theories in d-electron systems, LiTi2O4 being the first oxide superconductor provides critical insights into unconventional superconductivity driven by strong electron-phonon interactions, and MgTi2O4 pronounced orbital ordering and metalinsulator transition offers a clear model for exploring electron-lattice coupling. This shows how the inherent structural versatility of the spinel lattice, characterised by its cubic close-packed oxygen network and variable cation distributions, enables a rich interplay of electron-electron correlations, electron-lattice coupling, and orbital degrees of freedom. In LiV2O4, the combination of mixed-valence vanadium ions and a geometrically frustrated pyrochlore lattice gives rise to heavy fermion behaviour, whereas LiTi2O4 exhibits unconventional superconductivity driven by a high density of states at the Fermi level and strong electronphonon interactions. MgTi2O4 undergoes a pronounced metal-insulator transition, where orbital ordering triggers a Peierls-like distortion that stabilises a low-temperature insulating state through Ti-Ti dimerization. How the composition of these compounds affects their properties, based on both theoretical research and experimental findings, is illustrated by this review. It illustrates the promise of Spinels in practical technologies such as energy storage, electrocatalysis, and high-temperature lubrication.

cond-mat.mtrl-sci↗