Year: 2022
Type: article
Abstract: We report the synthesis and characterization of ${\mathrm{RbNi}}_{2}{\mathrm{Se}}_{2}$, an analog of the iron chalcogenide superconductor ${\mathrm{Rb}}_{x}{\mathrm{Fe}}_{2}{\mathrm{Se}}_{2}$, via transport, angle-resolved photoemission spectroscopy, and density functional theory calculations. A superconducting transition at ${T}_{c}=1.20$ K is identified. In the normal state, ${\mathrm{RbNi}}_{2}{\mathrm{Se}}_{2}$ shows paramagnetic and Fermi-liquid behaviors. A large Sommerfeld coefficient yields an effective electron mass of ${m}^{*}\ensuremath{\approx}6{m}_{e}$. In the superconducting state, zero-field electronic specific-heat data ${C}_{es}$ can be described by a two-gap BCS model, indicating that ${\mathrm{RbNi}}_{2}{\mathrm{Se}}_{2}$ is a possible multigap superconductor. Our density functional theory calculations and angle-resolved photoemission spectroscopy measurements demonstrate that ${\mathrm{RbNi}}_{2}{\mathrm{Se}}_{2}$ exhibits relatively weak correlations and multiband characteristics, consistent with the multigap superconductivity.
Language: Latvian
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G1286236842, G1286251239, G2128581245, G2283644098, G2411377579, G25169228, G30714459, G3219505319, G3807911295, G4030039108, G419881185, G42916606, G498139845, USING NEUTRON AS A PROBE TO STUDY MAGNETIC EXCITATIONS IN STRONGLY CORRELATED ELECTRON MATERIALS, G5313341328, G5724895686, G576086650, G6019281587, G6149348556, G631022902, G6461385855, G650090426, G6630628191, G6825490899, G704498496, G7058663106, USING NEUTRON AS A PROBE TO STUDY MAGNETIC EXCITATIONS IN STRONGLY CORRELATED ELECTRON MATERIALS, G7999018279, G8221456705, G8222742106, G8650814216, G969889393, G971274331
OpenAlex ID: W4225401240