Evidences for local non-centrosymmetricity and strong phonon anomaly in EuCuAs: a Raman spectroscopy and lattice dynamics study.

Phonon modes and their association with the electronic states have been investigated for the metallic EuCuAssystem. In this work, we present the Raman spectra of this pnictide system which clearly shows the presence of seven well defined peaks above 100 cmthat is consistent with the locally non-centrosymmetriccrystal structure, contrary to that what is expected from the accepted symmorphicstructure. Lattice dynamics calculations using thesymmetry attest that there is a commendable agreement between the calculated phonon spectra at the Γ point and the observed Raman mode frequencies, with the most intense peak at∼232 cmbeing ascribed to the A1gmode.

Observation of momentum-dependent charge density wave gap in a layered antiferromagnet [Formula: see text].

Charge density wave (CDW) ordering has been an important topic of study for a long time owing to its connection with other exotic phases such as superconductivity and magnetism. The [Formula: see text] (R = rare-earth elements) family of materials provides a fertile ground to study the dynamics of CDW in van der Waals layered materials, and the presence of magnetism in these materials allows to explore the interplay among CDW and long range magnetic ordering. Here, we have carried out a high-resolution angle-resolved photoemission spectroscopy (ARPES) study of a CDW material [Formula: see text], which is antiferromagnetic below [Formula: see text], along with thermodynamic, electrical transport, magnetic, and Raman measurements.

Theoretical Study of Dynamical and Electronic Properties of Noncentrosymmetric Superconductor NbReSi.

The noncentrosymmetric NbReSi superconductor with Tc≃6.5 K is characterized by the relatively large upper critical magnetic field. Its multigap features were observed experimentally.

Electronic Band Structure and Surface States in Dirac Semimetal LaAgSb.

LaAgSb2 is a Dirac semimetal showing charge density wave (CDW) order. Previous angle-resolved photoemission spectroscopy (ARPES) results suggest the existence of the Dirac-cone-like structure in the vicinity of the Fermi level along the Γ-M direction. This paper is devoted to a complex analysis of the electronic band structure of LaAgSb2 by means of ARPES and theoretical studies within the ab initio method as well as tight binding model formulation.

Electronic properties of BiSe dopped by 3d transition metal (Mn, Fe, Co, or Ni) ions.

Topological insulators are characterized by the existence of band inversion and the possibility of the realization of surface states. Doping with a magnetic atom, which is a source of the time-reversal symmetry breaking, can lead to realization of novel magneto-electronic properties of the system. In this paper, we study effects of substitution by the transition metal ions (Mn, Fe, Co and Ni) into BiSe on its electric properties.