Effect of Barium Codoping on Superconductivity in SrxBi2Se3

Kuntsevich, A. Yu.; Rybalchenko, Georgy; Мартовицкий, В. П.; Bannikov, M. I.; Selivanov, Yu. G.; Gavrilkin, S. Yu.; Tsvetkov, A. Yu.; Chizhevskii, E. G.

doi:10.1134/s002136402003008x

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…The dopants were originally thought to lie in the van der Waals gap between quintuple BiSe layers. However, recent results indicate that the microstructure may be more complicated [12][13][14][15][16][17][18]. Of the three members of the family, Sr x Bi 2 Se 3 has recently received the most attention despite its lower 𝑇𝑇 𝑐𝑐 as air stable, mm-scale crystals approaching 100% SC volume fraction can be grown, unlike the other members.…”

Section: Introductionmentioning

confidence: 99%

Nematic pinning of the superconducting state in the doped topological insulator Sr_xBi₂Se₃

Smylie

Islam

et al. 2022

J. Phys.: Conf. Ser.

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The discovery of a rotational symmetry breaking, or nematic, state in the superconducting doped topological insulator MxBi2Se3 (M = Cu, Sr, Nb) indicates a multicomponent superconducting order parameter which is topological. Many questions remain in this family of materials. In particular, the nematic axis of twofold symmetry is always pinned along one of three rotationally equivalent directions in the threefold symmetric basal plane in the rhombohedral crystal. Crystallographic strain has been proposed as the origin of the choice of pinning axis. Here, we discuss nematic pinning of the superconducting state, summarizing our magnetotransport, magnetization, penetration depth, and calorimetry measurements, which support the theoretical picture of topological superconductivity. We discuss the impact of controlled disorder via proton irradiation on the nematic superconducting state and discuss results of our multimodal technique for searching for crystallographic strain below 1 K via simultaneous diffraction and magnetotransport measurements.

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Section: Introductionmentioning

confidence: 99%

Nematic pinning of the superconducting state in the doped topological insulator Sr_xBi₂Se₃

Smylie

Islam

et al. 2022

J. Phys.: Conf. Ser.

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“…Introduction.-Nematic superconductivity in doped topological insulators attracts a great attention nowadays [1][2][3][4][5][6][7][8]. In these systems the superconducting order parameter is a time-reversal invariant, which corresponds to E u representation that breaks inversion symmetry and couples electrons with the same spin projections but from different orbitals [9,10].…”

mentioning

confidence: 99%

Strain-induced spin vortex and Majorana Kramers pairs in doped topological insulators with nematic superconductivity

Akzyanov

Rakhmanov

2021

Phys. Rev. B

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Using Ginzburg-Landau approach we show that the strain of the nematic superconductor can generate a specific (nematic) vorticity. In the case of doped topological insulators that vorticity forms a spin vortex. We find two types of topologically different spin vortices that either enhance (type I) or suppress (type II) superconductivity far from the vortex core. We apply Bogoliubov-de Geunnes equations to study electronic states in the nematic superconductor with spin vortices. We find that in the case of the vortex of type I, zero-energy states are localized near the vortex core. These states can be identified as Majorana Kramer's pairs. In the case of the vortex of type II, zeroenergy states form Majorana flat bands. Thus, we establish a non-trivial connection between the strain and Majorana fermions in the doped topological insulators with nematic superconductivity.

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Anomalous Behavior of the $$E_{u}^{1}$$ Infrared-active Phonon Mode in Bi2 – xSrxSe3 Crystal

et al. 2021

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Effect of Barium Codoping on Superconductivity in SrxBi2Se3

Cited by 3 publications

References 26 publications

Nematic pinning of the superconducting state in the doped topological insulator Sr_xBi₂Se₃

Nematic pinning of the superconducting state in the doped topological insulator Sr_xBi₂Se₃

Strain-induced spin vortex and Majorana Kramers pairs in doped topological insulators with nematic superconductivity

Anomalous Behavior of the $$E_{u}^{1}$$ Infrared-active Phonon Mode in Bi2 – xSrxSe3 Crystal

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Effect of Barium Codoping on Superconductivity in SrxBi2Se3

Cited by 3 publications

References 26 publications

Nematic pinning of the superconducting state in the doped topological insulator SrxBi2Se3

Nematic pinning of the superconducting state in the doped topological insulator SrxBi2Se3

Strain-induced spin vortex and Majorana Kramers pairs in doped topological insulators with nematic superconductivity

Anomalous Behavior of the $$E_{u}^{1}$$ Infrared-active Phonon Mode in Bi2 – xSrxSe3 Crystal

Contact Info

Product

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About

Nematic pinning of the superconducting state in the doped topological insulator Sr_xBi₂Se₃

Nematic pinning of the superconducting state in the doped topological insulator Sr_xBi₂Se₃