Polymorphic 
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: Growth, structure, and superconducting properties

Shipunov, Grigory; Koval’chuk, I. V.; Piening, B. R.; Labracherie, Valentin; Veyrat, Arthur; Wolf, Daniel; Lubk, Axel; Subakti, S.; Giraud, R.; Dufouleur, Joseph; Shokri, Siamak; Caglieris, Federico; Heß, Christian; Efremov, D. V.; Büchner, B.; Aswartham, Saicharan

doi:10.1103/physrevmaterials.4.124202

Cited by 24 publications

(12 citation statements)

References 29 publications

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“…We performed fully relativistic density functional calculations treating the spin−orbit coupling in the fourcomponent formalism 28 (see section S1 of the Supporting Information for more details). Similar to previous works, 23,27 the band structure indicates a semimetallic character with several bands crossing the Fermi energy, generating various electron and hole pockets (Figure 1c). A search for accidental crossings of bands at isolated points (Weyl nodes, allowed by broken ) between bands N and N + 1, where N is the number of valence electrons per unit cell, yields the existence of 12 symmetry-related Weyl nodes, at 48 meV above the Fermi energy (Figure 1b).…”

supporting

confidence: 87%

“…To investigate the properties of bulkt-PtBi 2 , high-quality single crystals were grown via the self-flux method 27 and contacted in a four-probe configuration using silver wires and conducting epoxy. The temperature and magnetic field dependence of the resistance as well as the measured Shubnikov−de Haas oscillations show a good agreement with previously reported results 23 as well as with our band structure calculations (see section S2 of the Supporting Information).…”

mentioning

confidence: 99%

“…We calculated the electronic structure of bulk t-PtBi 2 in the space group P 31 m based on the crystal structure reported in ref . We performed fully relativistic density functional calculations treating the spin–orbit coupling in the four-component formalism (see section S1 of the Supporting Information for more details).…”

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confidence: 99%

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Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi₂

et al. 2023

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Symmetry breaking in topological matter has become in recent years a key concept in condensed matter physics to unveil novel electronic states. In this work, we predict that broken inversion symmetry and strong spin–orbit coupling in trigonal PtBi2 lead to a type-I Weyl semimetal band structure. Transport measurements show an unusually robust low dimensional superconductivity in thin exfoliated flakes up to 126 nm in thickness (with T c ∼ 275–400 mK), which constitutes the first report and study of unambiguous superconductivity in a type-I Weyl semimetal. Remarkably, a Berezinskii-Kosterlitz-Thouless transition with T BKT ∼ 310 mK is revealed in up to 60 nm thick flakes, which is nearly an order of magnitude thicker than the rare examples of two-dimensional superconductors exhibiting such a transition. This makes PtBi2 an ideal platform to study low dimensional and unconventional superconductivity in topological semimetals.

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confidence: 87%

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confidence: 99%

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Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi₂

et al. 2023

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“…PtBi 2 single crystals were grown as described in Ref. [57]. Angle-resolved photoemission spectroscopy (ARPES) measurements were carried out at "1 3 -ARPES" facility at BESSY at a temperature of 1 K within a wide range of photon energies (60 -100 eV) from the cleaved surface of high-quality single crystals.…”

Section: Methodsmentioning

confidence: 99%

Sixfold fermion near the Fermi level in cubic PtBi2

et al. 2021

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We show that the cubic compound PbBi2 is a topological semimetal hosting a sixfold band touching point in close proximity to the Fermi level. Using angle-resolved photoemission spectroscopy, we map the band structure of the system, which is in good agreement with results from density functional theory. Further, by employing a low energy effective Hamiltonian valid close to the crossing point, we study the effect of a magnetic field on the sixfold fermion. The latter splits into a total of twenty Weyl cones for a Zeeman field oriented in the diagonal, (111) direction. Our results mark cubic PbBi2 as an ideal candidate to study the transport properties of gapless topological systems beyond Dirac and Weyl semimetals.

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“…Both phases * Author to whom any correspondence should be addressed. are metastable at room temperature; therefore, a thermalquenching procedure is performed during crystal growth to retain these phases [5]. Despite this, high-quality single crystals are obtained with a residual resistivity ρ 0 < 1 µΩ cm and residual resistivity ratio RRR= ρ(300 K)/ρ(0) of several hundred [6,7].…”

Section: Introductionmentioning

confidence: 99%

Enhanced weak superconductivity in trigonal γ-PtBi₂

Zabala,

Correa,

Castro

et al. 2024

J. Phys.: Condens. Matter

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Electrical resistivity experiments show superconductivity at Tc= 1.1 K in a high-quality single crystal of trigonal γ-PtBi2, with an enhanced critical magnetic ﬁeld µ0Hc2(0) ≥ 1.5 Tesla and a low critical current-density Jc(0) ≈ 40 A/cm2 at H = 0. Both Tc and Hc2(0) are the highest reported values for stoichiometric bulk samples at zero pressure. We found a weak Hc2 anisotropy with Γ = Hab c2 /Hc c2 < 1, which is unusual among superconductors. Under a magnetic ﬁeld, the superconducting transition becomes broader and asymmetric. Along with the low critical currents, this observation suggests an inhomogeneous superconducting state. In fact, no trace of superconductivity is observed through ﬁeld-cooling–zero-ﬁeld-cooling magnetization experiments.experiments.

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Polymorphic PtBi2 : Growth, structure, and superconducting properties

Cited by 24 publications

References 29 publications

Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi₂

Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi₂

Sixfold fermion near the Fermi level in cubic PtBi2

Enhanced weak superconductivity in trigonal γ-PtBi₂

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Polymorphic PtBi2 : Growth, structure, and superconducting properties

Cited by 24 publications

References 29 publications

Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi2

Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi2

Sixfold fermion near the Fermi level in cubic PtBi2

Enhanced weak superconductivity in trigonal γ-PtBi2

Contact Info

Product

Resources

About

Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi₂

Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi₂

Enhanced weak superconductivity in trigonal γ-PtBi₂