Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2

Abstract

PtBi2 is a Weyl semimetal, which demonstrates superconductivity with low critical temperature Tc ~ 0.6 K in the bulk. Here, we report our study of electron-phonon interaction (EPI) in trigonal PtBi2 by the Yanson point contact (PC) spectroscopy and presenting the observation of PC enhanced superconductivity. We show, that the Yansons PC spectra display a broad maximum around 15 meV, indicating, apparently, EPI mechanism of Cooper pairing in PtBi2. Moreover, we discovered a substantial increase of Tc up to ~ 3.5 K in PCs. The observed Tc is sufficiently higher than the bulk value, as well as detected at hydrostatic pressure. We calculated the phonon density of states and Eliashberg EPI function in PtBi2 within the framework of the density functional theory. A comparison of experimental data with theoretical calculations showed acceptable agreement. The theoretical Tc is 3.5 K, which corresponds to the experimental value.

arXiv comment13 pages, 4 figs, with supplement. Submitted to Low Temp. Phys. (Fiz. Nizk. Temp.)

References in corpus (29)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Quantum ESPRESSO toward the exascale
• Search for Majorana fermions in superconductors
• Topological superconductors: a review
• Introduction to topological superconductivity and Majorana fermions
• Observation of superconductivity in 3D Dirac semimetal Cd3As2 crystal
• Probing Spin Polarization with Andreev Reflection: A Theoretical Basis
• Unconventional Superconductivity at Mesoscopic Point-contacts on the 3-Dimensional Dirac Semi-metal Cd${}_3$As${}_2$
• Extremely large magnetoresistance in a topological semimetal candidate pyrite PtBi2
• Environmental Instability and Degradation of Single- and Few-Layer WTe2 Nanosheets in Ambient Conditions
• Tip induced unconventional superconductivity on Weyl semimetal TaAs
• Observation of Andreev bound state and multiple energy gaps in the non-centrosymmetric superconductor BiPd
• Mesoscopic superconductivity and high spin polarization coexisting at metallic point contacts on the Weyl semimetal TaAs
• Superconductivity in topologically nontrivial material Au2Pb
• Controlled Layer-by-Layer Oxidation of MoTe2 via O3 Exposure
• Polymorphic PtBi2: Growth, structure and superconducting properties
• Superconductivity in type-II Weyl-semimetal WTe2 induced by a normal metal contact
• Surface superconductivity in the Weyl semimetal MoTe2 detected by point contact spectroscopy
• Giant Linear Magneto-resistance in Nonmagnetic PtBi2
• Observation of Dirac surface states in the hexagonal PtBi2, a possible origin of the linear magnetoresistance
• Superconductivity Induced at a Point Contact on the Topological Semimetal Tungsten Carbide
• Bulk and surface electronic structure of trigonal structured PtBi2 studied by angle-resolved photoemission spectroscopy
• Evidence of Interfacial Topological Superconductivity on the Topological Semimetal Tungsten Carbide Induced by Metal Deposition
• Doubling of the critical temperature of FeSe observed in point contacts
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Anatomy of point-contact Andreev reflection spectroscopy from the experimental point of view (review)
• Sixfold fermion near the Fermi level in cubic PtBi2
• Yanson point-contact spectroscopy of Weyl semimetal WTe2
• Enhanced critical temperatures in the strongly overdoped iron-based superconductors AFe${}_2$As${}_2$ (A = K, Cs, Rb) observed by point contacts

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