Published in IUCrJ
Charge density waves spontaneously breaking lattice symmetry through periodic lattice distortion, and electron–electron and electron–phonon interactions, can lead to a new type of electronic band structure. Bulk 2H-TaS2 is an archetypal transition metal dichalcogenide supporting charge density waves with a phase transition at 75 K. Here, it is sho...
Charge and thermal transport in a crystal is carried by free electrons and phonons (quantized lattice vibration), the two most fundamental quasiparticles. Above the Debye temperature of the crystal, phonon-mediated thermal conductivity (κ L) is typically limited by mutual scattering of phonons, which results in κ L decreasing with inverse temperatu...
Published in IUCrJ
Single crystals of the m = 8 member of the low-dimensional monophosphate tungsten bronzes (PO2)4(WO3)2 m family were grown by chemical vapour transport technique and the high crystalline quality obtained allowed a reinvestigation of the physical and structural properties. Resistivity measurements revealed three anomalies at T C1 = 258 K, T C2 = 245...
Emergent behaviors arising from strongly correlated electron materials continue to puzzle physicists as there are still no clear explanations behind the underpinning mechanisms. The key hides in the collective behavior originating from the interactions among the electronic degrees of freedom, and the objective is to use various experimental probes ...
Published in Inorganic Materials
Abstract—We consider experimental data on the order parameter structure in superconductors with a layered perovskite structure: La2CuO4 and Sr2RuO4. Experimental data are analyzed using the space group approach to two-electron states in crystals. From the crystalline symmetry of Sr2RuO4, we derive two-electron functions with Eu symmetry, having nod...
Published in Nano letters
The last two decades have seen tremendous progress in quantitative understanding of several major phonon scattering mechanisms (phonon-phonon, phonon-boundary, phonon-defects), as they are the determinant factors in lattice thermal transport, which is critical for the proper functioning of various electronic and energy conversion devices. However, ...
Published in Advanced materials (Deerfield Beach, Fla.)
Ultrathin two-dimensional (2D) charge density wave (CDW) materials, with sharp resistance change at the phase-transition temperature, yet with ultrathin thickness, hold great potential for electrical device applications. However, chemical synthesis of high-quality samples and observation of the CDW states down to the monolayer limit is still of gre...
Published in Proceedings of the National Academy of Sciences of the United States of America
A charge density wave (CDW) is one of the fundamental instabilities of the Fermi surface occurring in a wide range of quantum materials. In dimensions higher than one, where Fermi surface nesting can play only a limited role, the selection of the particular wavevector and geometry of an emerging CDW should in principle be susceptible to controllabl...
Published in Proceedings of the National Academy of Sciences of the United States of America
Although all superconducting cuprates display charge-ordering tendencies, their low-temperature properties are distinct, impeding efforts to understand the phenomena within a single conceptual framework. While some systems exhibit stripes of charge and spin, with a locked periodicity, others host charge density waves (CDWs) without any obviously re...
Published in Journal of Electronic Materials
The charge density wave (CDW) transition in (SnSe)1.15VSe2 ferecrystals was investigated through the systematic addition of isoelectronic Ta dopants. (SnSe)1.15 (V1−xTax)Se2 ferecrystals with alloyed V1−xTaxSe2 layers, where x = 0, 0.04, 0.06, 0.07, and 0.09, were prepared from amorphous precursors using the modulated elemental reactants (MER) meth...
