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Structural Phase Transition and Superconductivity in 2H-BaGaGe with Buckled Honeycomb Layers
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Structural Phase Transition and Superconductivity in 2H-BaGaGe with Buckled Honeycomb Layers
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Paper
Structural Phase Transition and Superconductivity in 2H-BaGaGe with Buckled Honeycomb Layers
2023
Overview
We report on the structural and superconducting properties of the intermetallic compound BaGaGe. We find that this material undergoes a structural second-order phase transition from the distorted AlB\\(_2\\)-type structure (1H, \\(a\\) = 4.3254(2) Å, \\(c\\) = 5.1078(3) Å, P6/mmm) into the CaIn\\(_2\\)-type structure (2H, \\(a\\) = 4.3087(3) Å, \\(c\\) = 10.2117(6) Å, P6\\(_3\\)/mmc) at a transition temperature of \\(T_ S\\) = 253 K. We find that the structural phase-transition corresponds to a coherent buckling of the honeycomb layers, which we can interpret as a disorder-to-order transition of the atoms located within this layer. We show that the 2H-BaGaGe phase becomes superconducting at a critical temperature of \\(T_ c\\) = 2.1 K. The bulk nature of the superconductivity in 2H-BaGaGe is confirmed by means of specific heat measurements, where we determine a value of \\( C\\)/\\( T_ c\\) = 1.59, which is close to the expected BCS value in the weak coupling limit.
Publisher
Cornell University Library, arXiv.org
