Structural phase transition and superconductivity in 2H-BaGaGe with buckled honeycomb layers
Dorota I. Walicka, Robin Lefèvre, Olivier Blacque, Sara A. López-Paz, Carl W. Rischau, Antonio Cervellino, Carlos A. Triana, Fabian O. von Rohr
DOI 10.1103/PhysRevMaterials.7.074805 · Physical Review Materials
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Abstract
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 a distorted AlB2-type structure [1H, a=4.3254(2) Å, c=5.1078(3) Å, P6/mmm] into a CaIn2-type structure [2H, a=4.3087(3) Å, c=10.2117(6) Å, P63/mmc] at a transition temperature of TS=253K. 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 Tc=2.1K. The bulk nature of the superconductivity in 2H-BaGaGe is confirmed by means of specific-heat measurements, where we determine a value of ΔC/γTc=1.59, which is close to the expected BCS value in the weak-coupling limit.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaGaGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.1 | Pressure not reported | unknown |
| BaGaGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.1 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure not reported | unknown |
| BaGaGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.4 | Pressure not reported | unknown |
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