Absence of Andreev bound states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>β</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>PdBi</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>probed by point-contact Andreev reflection spectroscopy

Che, Liqiang; Le, Taoran; Xu, Chunqiang; Xing, Xiangzhuo; Shi, Zhixiang; Xu, Xiaofeng; Lu, Xin

doi:10.1103/physrevb.94.024519

Cited by 21 publications

(39 citation statements)

References 42 publications

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“…Since the strong spin-orbit coupling (SOC) inherent to the heavy element Bi induces significant changes in the electronic band structure [15,16], β-Bi 2 Pd compound offers the opportunity to further study the interplay of the spin-orbit coupling effect with superconductivity. We find that β-Bi 2 Pd displays BCS-like superconductivity with a single anisotropic superconducting gap in agreement with recent experimental findings [10][11][12][13].…”

Section: Introductionsupporting

confidence: 91%

Electron-phonon coupling and pairing mechanism in β−Bi2Pd centrosymmetric superconductor

Zheng¹,

Margine²

2017

Phys. Rev. B

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We report first-principles calculations of the superconducting properties of β-Bi2Pd within the fully anisotropic Migdal-Eliashberg formalism. We find a single anisotropic superconducting gap of s-wave symmetry which varies in magnitude on the different regions of the Fermi surface. The calculated superconducting energy gap on the Fermi surface, the superconducting transition temperature, the specific heat, and the quasi-particle density of states are in good agreement with the corresponding experimental results and support the view that β-Bi2Pd is a phonon-mediated single anisotropic gap superconductor.

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Section: Introductionsupporting

confidence: 91%

Electron-phonon coupling and pairing mechanism in β−Bi2Pd centrosymmetric superconductor

Zheng¹,

Margine²

2017

Phys. Rev. B

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“…2,6 Even in the NCS superconduc- tor α-PdBi, ultra-low-temperature scanning tunneling spectra 16 obtained a similar value of ∆(0)/k B T c ≈ 1.9. Clearly, these values are consistent with the parameters reported in our work.…”

mentioning

confidence: 72%

Probing the superconducting gap symmetry of α−PdBi2 : A penetration depth study

et al. 2017

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We report measurements of the in-plane London penetration depth λ in single crystals of the α-PdBi2 superconductor -the α-phase counterpart of the putative topological superconductor β-PdBi2, down to 0.35 K using a high-resolution tunnel-diode-based technique. Both λ and superfluid density ρs exhibit an exponential behavior for T ≤ 0.35Tc, with ∆(0)/kBTc ∼2.0, ∆C/γTc∼2.0 and λ(0)∼140 nm, showing that α-PdBi2 is a moderately-coupling, fully-gapped superconductor. The values of ∆(0) and ∆C/γTc are consistent with each other via strong-coupling corrections.

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“…[1][2][3][4][5][6] Topological superconductivity is a new state of matter possessing symmetry-protected surface states while the bulk states are fully gapped by superconducting pairing. [7][8][9][10] The Majorana fermions are believed to exist on the surface or vortex core in such TSs, which may not only be of scientific importance, but also can lead to a wide-ranging applications in microelectronic devices and quantum computing.…”

Section: Introductionmentioning

confidence: 99%

“…The centrosymmetric stoichiometric β-PdBi 2 (T c ∼ 5 K) was claimed to be topologically nontrivial in view of the observation of the topologically-protected surface modes by spin-and angle-resolved ARPES. 4 However, no Andreev bound states associated with Majorana fermions are detectable through point-contact spectroscopy, 6 in sharp contrast to the cases in Cu-intercalated Bi 2 Se 3 11,12 and In-doped SnTe. 13 On the other hand, it becomes the common wis- , 0.92c) and ( , 0.08c), respectively.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, physical properties, and band structure of the layered bismuthidePtBi2

Xing

et al. 2016

Phys. Rev. B

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We report details of single crystal growth of stoichiometric bismuthide PtBi2 whose structure consists of alternate stacking of Pt layer sandwiched by Bi bilayer along the c-axis. The compound crystallizes in space group P-3 with a hexagonal unit cell of a=b=6.553Å, c=6.165Å. The magnetization data show opposite sign for fields parallel and perpendicular to the Pt layers, respectively. The T -dependent resistivity is typical of a metal and the magnetic response shows clear two types of charge carriers and the validity of the semi-classical Kohler's rule. Its physical properties was discussed in comparison with recently proposed topological superconductor β-PdBi2.

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Absence of Andreev bound states inβ−PdBi2probed by point-contact Andreev reflection spectroscopy

Cited by 21 publications

References 42 publications

Electron-phonon coupling and pairing mechanism in β−Bi2Pd centrosymmetric superconductor

Electron-phonon coupling and pairing mechanism in β−Bi2Pd centrosymmetric superconductor

Probing the superconducting gap symmetry of α−PdBi2 : A penetration depth study

Synthesis, physical properties, and band structure of the layered bismuthidePtBi2

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