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Collective modes in terahertz field response of disordered superconductors.
J Phys Condens Matter
January 2025
Department of Physics, Kent State University, 008 Smith Hall, Kent, Ohio, 44240, UNITED STATES.
We consider a problem of nonlinear response to an external electromagnetic radiation in conventional disordered superconductors which contain a small amount of weak magnetic impurities. We focus on the diffusive limit and use Usadel equation to analyze the excitation energy and dispersion relation of the collective modes. We determine the resonant frequency and dispersion of both amplitude (Schmidt-Higgs) and phase (Carlson-Goldman) modes for moderate strength of magnetic scattering.
View Article and Find Full Text PDFAntiferromagnetic semimetal terahertz photodetectors enhanced through weak localization.
Nat Commun
January 2025
State Key Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Yutian Road 500, Shanghai, 200083, China.
Article Synopsis
- The study explores the terahertz detection capabilities of the two-dimensional antiferromagnetic semimetal NbFeTe, highlighting its unique properties.
- The interaction of antiferromagnetic moments and electron spins leads to a nonlinear increase in the material's responsivity as temperatures drop, facilitated by the use of asymmetric electrodes.
- The NbFeTe₂/graphene heterojunction achieves impressive performance metrics, indicating its potential for high-speed imaging in terahertz applications.
Investigation of magnetic and transport properties of GdSbSe.
J Phys Condens Matter
January 2025
Department of Chemistry, Indian Institute of Technology Delhi, Indian Institute of Technology Delhi, Hauz Khas, New delhi, New Delhi, Delhi, 110016, INDIA.
We report the detailed investigation of the magnetic, transport, and magnetocaloric effects of GdS- bSe by magnetic susceptibility χ(T ), isothermal magnetization M (H), resistivity ρ(T, H), and heat capacity Cp(T ) measurements, crystallizing in the ZrSiS-type tetragonal crystal system with space group P 4/nmm. Temperature-dependent magnetic susceptibility measurements revealed long-range antiferromagnetic ordering with two additional magnetic anomalies below N´eel temperature (TN ≈ 8.6 K), corroborated through magnetocaloric and specific heat studies.
View Article and Find Full Text PDFHeterostructure growth, electrical transport and electronic structure of crystalline Dirac nodal arc semimetal PtSn.
Sci Rep
December 2024
Department of Physics, University of Liverpool, Oxford Street, Liverpool, L69 7ZE, UK.
Topological semimetals have recently garnered widespread interest in the quantum materials research community due to their symmetry-protected surface states with dissipationless transport which have potential applications in next-generation low-power electronic devices. One such material, [Formula: see text], exhibits Dirac nodal arcs and although the topological properties of single crystals have been investigated, there have been no reports in crystalline thin film geometry. We examined the growth of [Formula: see text] heterostructures on a range of single crystals by optimizing the electron beam evaporation of Pt and Sn and studied the effect of vacuum thermal annealing on phase and crystallinity.
View Article and Find Full Text PDFEffects of Nicotine on the Thermodynamics and Phase Coexistence of Pulmonary Surfactant Model Membranes.
Membranes (Basel)
December 2024
Laboratório de Ciências Físicas, Centro de Ciência e Tecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Avenida Alberto Lamego, 2000, Campos dos Goytacazes 28013-602, RJ, Brazil.
Phase separation is essential for membrane function, and alterations in phase coexistence by membrane-interacting molecules, such as nicotine, can impair membrane stability. With the increasing use of e-cigarettes, concerns have arisen about the impact of nicotine on pulmonary surfactants. Here, we used differential scanning calorimetry (DSC), molecular dynamics (MD) simulations, and electron spin resonance (ESR) to examine nicotine's effect on the phase coexistence of two surfactant models: pure DPPC and a DPPC/POPC/POPG mixture.
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