Publications by authors named "Aperis A"
Article Synopsis
- The search for room-temperature superconductors has led to the discovery of unique electron-phonon interactions in metal superhydrides, particularly focusing on neodymium (Nd) compounds.
- Researchers identified several metallic Nd-H phases synthesized under high pressure, including 4/-NdH, 2/-NdH, and 6/-NdH, with varying stability and a lower trihydride form being stable under different pressures.
- Preliminary measurements suggest that 6/-NdH may exhibit superconductivity at around 4.5 K, and theoretical calculations indicate that these neodymium hydrides exhibit antiferromagnetic order and significant electronic properties related to spin interactions.
Article Synopsis
- Hydrogen-based compounds like H3S and LaH10 show superconductivity through electron-phonon coupling at record temperatures under ultrahigh pressure.
- In a different approach, using hydrogen adatoms in a two-dimensional material enhances superconductivity by increasing the electronic density of states and electron-phonon coupling through van Hove singularities and high-frequency hydrogen phonon modes.
- The study specifically shows that adding hydrogen adatoms to monolayer MgB2 can achieve a superconducting critical temperature of 67 K, potentially exceeding 100 K with applied tensile strain.
Topological Dirac semimetals with accidental band touching between conduction and valence bands protected by time reversal and inversion symmetry are at the frontier of modern condensed matter research. A majority of discovered topological semimetals are nonmagnetic and conserve time reversal symmetry. Here we report the experimental discovery of an antiferromagnetic topological nodal-line semimetallic state in GdSbTe using angle-resolved photoemission spectroscopy.
View Article and Find Full Text PDFAmong the quantum materials that have recently gained interest are the topological insulators, wherein symmetry-protected surface states cross in reciprocal space, and the Dirac nodal-line semimetals, where bulk bands touch along a line in k-space. However, the existence of multiple fermion phases in a single material has not been verified yet. Using angle-resolved photoemission spectroscopy (ARPES) and first-principles electronic structure calculations, we systematically study the metallic material HfTeP and discover properties, which are unique in a single topological quantum material.
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- Two-dimensional materials exhibit unique properties that differ significantly from their bulk forms, particularly in superconductivity, which is often enhanced by specific substrates or intercalants.
- Recent research highlights the critical role of surface states in few-monolayer MgB, contributing significantly to the superconducting gap spectrum, distinct from the conventional bulk-like gaps.
- The study indicates that accessible surface states can lead to superconductivity at higher temperatures, with observed gap openings reaching around 30 K in just six layers of MgB, emphasizing the importance of free surfaces in atomically thin materials for future superconductivity research.
CeCoIn5 is an anomalous superconductor which exhibits a high-magnetic-field phase that consists of a modulated magnetic coupling together with persistent superconducting order. Here we use a generic microscopic model to argue that this state is a pattern of coexisting condensates: a d-wave singlet superconducting (SC) state, a staggered π-triplet SC state, and a spin density wave (SDW). Our microscopic picture allows a calculation of the phase diagram, and physical consequences including NMR.
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