Single crystal growth and superconductivity in RbNi2Se2
Abstract
We report the synthesis and characterization of RbNi2Se2, an analog of the iron chalcogenide superconductor RbxFe2Se2, via transport, angle resolved photoemission spectroscopy, and density functional theory calculations. A superconducting transition at Tc = 1.20 K is identified. In normal state, RbNi2Se2 shows paramagnetic and Fermi liquid behaviors. A large Sommerfeld coefficient yields a heavy effective electron mass of m*≈6me. In the superconducting state, zero-field electronic specific-heat data Ces can be described by a two-gap BCS model, indicating that RbNi2Se2 is a multi-gap superconductor. Our density functional theory calculations and angle resolved photoemission spectroscopy measurements demonstrate that RbNi2Se2 exhibits relatively weak correlations and multi-band characteristics, consistent with the multi-gap superconductivity.
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