Layers of intrigue: superconductivity at 4.4 K in Ba<sub>2</sub>Bi<sub>3</sub>

Wimbush, Stuart C.

doi:10.1088/0953-2048/27/7/070501

Cited by 1 publication

(2 citation statements)

References 16 publications

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“…Recently, the discovery of the bismuth binary compound superconductors has excited a greater enthusiasm [1][2][3][4][5] for their potential of uncovering the unconventional superconductivity and indicating a possible way to induce new superconductors with higher superconducting transition temperature. The Ba 2 Bi 3 phase, as one of the bismuth binary compounds, was revealed of its superconductivity with a transition temperature (T c ) of 4.4 K recently [5,6], even had been already discovered since 2004 [7]. Different from other bismuth binary superconductors, the Ba 2 Bi 3 has an attractive character of the layered structure with two-dimensional superconducting Bi planes intercalated by Ba atoms.…”

Section: Introductionmentioning

confidence: 99%

“…It has been found that the pressure can induce some novel superconductivities [8,9] and also has some significant effects on other physics of layered structures. The layered Ba 2 Bi 3 , as a parent phase, should show new physics under compression [6]. Besides, the layered Ba 2 Bi 3 is extracted from the heavier end of the periodic table of elements and can be regarded as another analogue of cuprates.…”

Section: Introductionmentioning

confidence: 99%

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Pressure effect on the mechanical, electronic and thermodynamic properties of Ba2Bi3: First-principle calculations

Cao

Gou

2017

Journal of Physics and Chemistry of Solids

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The newly discovered Ba 2 Bi 3 phase has attracted attentions in search of new superconductors, mainly because of the layered structure with two-dimensional superconducting Bi planes intercalated by Ba atoms. To clearly reveal what features the layered structure of the Ba 2 Bi 3 phase correlates with, especially under pressure, we have systematically investigated the structural, mechanical, electronic and thermodynamic properties under the equivalent hydrostatic pressures up to 14 GPa by means of first-principle calculations with the Local Density Approximation (LDA) and Generalized Gradient Approximation (GGA) approaches. The results indicate that the pressure effect on the crystal structure is performed as a compression of the unit-cell volume, mainly along the c-axis. Specifically for the mechanical related properties, the elastic constants and polycrystalline elastic moduli monotonically increase with the pressure. The calculated ductile factors show that the Ba 2 Bi 3 lies in between the brittle and ductile border line at 0 GPa and the pressure makes the ductility enhancement. Besides, the anisotropic properties of the Ba 2 Bi 3 under various pressures are discussed. The electronic energy band structure and density of states under pressure are analyzed. Moreover, the pressure and temperature dependence of the thermodynamic properties through the quasi-harmonic Debye model, together with the pressure dependence of the Debye temperature calculated from elastic constants has been obtained. The calculated results of the variation of the Debye temperature and total density of states at Fermi level show that the pressure can lead to the superconducting transition temperature (T c) of the Ba 2 Bi 3 decreasing.

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