Fully gapped superconductivity in In-doped topological crystalline insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Pb</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sn</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:mi>Te</mml:mi></mml:mrow></mml:math>

Du, Gonghuan; Du, Zuliang; Fang, Delong; Yang, Huan; Zhong, Ruidan; Schneeloch, John; Gu, Genda; Wen, Hao

doi:10.1103/physrevb.92.020512

Cited by 21 publications

(27 citation statements)

References 47 publications

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“…In a superconductor with nodes, λ is proportional to T n (n 1) at low temperatures. Our result is consistent with the specific heat [17], thermal conductivity [18], and μSR [19] measurements in Sn 1−x In x Te and the scanning tunneling spectroscopy in (Pb 0.5 Sn 0.5 ) 0.7 In 0.3 Te [25]. Figure 5 shows the temperature dependence of the Knight shift K, which is T independent above T c but decreases below T c .…”

Section: Resultssupporting

confidence: 89%

Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te

et al. 2017

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The In-doped topological crystalline insulator Sn 1−x In x Te is a candidate for a topological superconductor, where a pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn 1−x In x Te, we perform 125 Te-nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0 x 0.15. The penetration depth calculated from the NMR line width is T independent below half the superconducting transition temperature (T c ) in polycrystalline Sn 0.96 In 0.04 Te, which indicates a fully opened superconducting gap. In this sample, the spin susceptibility measured by the spin Knight shift (K s ) at an external magnetic field of μ 0 H 0 = 0.0872 T decreases below T c , and K s (T = 0)/K s (T = T c ) reaches 0.36 ± 0.10, which is far below the limiting value 2/3 expected for a spin-triplet state for a cubic crystal structure. Our result indicates that polycrystalline Sn 0.96 In 0.04 Te is a spin-singlet superconductor.

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Section: Resultssupporting

confidence: 89%

Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te

et al. 2017

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“…TSCs have various exotic phenomena and can help to realize topological quantum computation [1][2][3] . A lot of efforts have been devoted to study the one dimensional 4,5 , two dimensional [6][7][8] , and three dimensional [9][10][11][12][13][14][15][16][17][18][19][20] Among the three dimensional systems, superconductors derived from Bi2Se3 by chemical doping are intensively studied and are predicted to be candidates of TSCs 11,12 . Point contact measurements have detected zero-bias conductance peaks (ZBCPs) on the surface of CuxBi2Se3 which are interpreted to be signatures of Majorana fermions 9,10 .…”

Section: The Majorana Fermions Inmentioning

confidence: 99%

Superconductivity with two-fold symmetry in topological superconductor Sr x Bi2Se3

Du¹,

Li²,

Schneeloch³

et al. 2017

Sci. China Phys. Mech. Astron.

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Topological superconductivity is the quantum condensate of paired electrons with an odd parity of the pairing function. One of the candidates is the triplet pairing superconductor derived from topological insulator Bi2Se3 by chemical doping. Theoretically it was predicted that a two-fold superconducting order parameter may exist in this kind of bulk topological superconductor. Earlier experiments by nuclear magnetic resonance and angle-resolved magnetocaloric measurements seem to support this picture. By using a Corbino-shape like electrode configuration, we measure the c-axis resistivity without the influence of the vortex motion and find clear evidence of two-fold superconductivity in the recently discovered topological superconductor SrxBi2Se3. The Laue diffraction measurements on these samples show that the maximum gap direction is either parallel or perpendicular to the main crystallographic axis.

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“…STM studies of SIT single crystal samples have been successfully performed [23], as discussed in Section 2.5. Direct ARPES studies of PSIT single crystals are few, and it has proven more practical to perform measurements on thin films evaporated from previously characterized bulk samples [36,39].…”

Section: Crystal Structurementioning

confidence: 99%

Indium Substitution Effect on the Topological Crystalline Insulator Family (Pb1−xSnx)1−yInyTe: Topological and Superconducting Properties

Zhong

Schneeloch

et al. 2017

Crystals

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Topological crystalline insulators (TCIs) have been of great interest in the area of condensed matter physics. We investigated the effect of indium substitution on the crystal structure and transport properties in the TCI system (Pb 1−x Sn x ) 1−y In y Te. For samples with a tin concentration x ≤ 50%, the low-temperature resisitivities show a dramatic variation as a function of indium concentration: with up to ∼2% indium doping, the samples show weak-metallic behavior similar to their parent compounds; with ∼6% indium doping, samples have true bulk-insulating resistivity and present evidence for nontrivial topological surface states; with higher indium doping levels, superconductivity was observed, with a transition temperature, T c , positively correlated to the indium concentration and reaching as high as 4.7 K. We address this issue from the view of bulk electronic structure modified by the indium-induced impurity level that pins the Fermi level. The current work summarizes the indium substitution effect on (Pb,Sn)Te, and discusses the topological and superconducting aspects, which can be provide guidance for future studies on this and related systems.

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Fully gapped superconductivity in In-doped topological crystalline insulatorPb0.5Sn0.5Te

Cited by 21 publications

References 47 publications

Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te

Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te

Superconductivity with two-fold symmetry in topological superconductor Sr x Bi2Se3

Indium Substitution Effect on the Topological Crystalline Insulator Family (Pb1−xSnx)1−yInyTe: Topological and Superconducting Properties

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