Directional Tunneling and Andreev Reflection on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:

Wei, J.Y.T.; Yeh, N.-C.; Garrigus, D. F.; Strasik, M.

doi:10.1103/physrevlett.81.2542

Cited by 389 publications

(280 citation statements)

References 39 publications

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“…The hallmark of a pure d-wave OP in the tunneling spectra is the zero bias conductance peak (ZBCP) observed for tunneling along and near the nodal [110] direction [5][6][7][8][9][10][11] , reflecting the existence of surface Andreev bound states at the Fermi level [12][13][14][15][16] . In addition, U and V-shaped gaps can be seen, respectively, in the [100] and [001] directions 8, 11 , 15, 17, 18 .…”

Section: Introductionmentioning

confidence: 99%

Local and macroscopic tunneling spectroscopy ofY1−xCaxBa<

et al. 2002

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Section: Introductionmentioning

confidence: 99%

Local and macroscopic tunneling spectroscopy ofY1−xCaxBa<

et al. 2002

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“…38 A distinct manifestation of these MSS is the zero-bias conductance peak (ZBCP) observed in the N/S tunneling spectra on various unconventional superconductors, 36,39,40 sometimes with robust spectral height and sharpness. 41 These MSS are also manifested in penetration-depth measurements. 42,43 Midgap quasiparticle states can also form about an isolated real-space nodal line of a tanh(x)-like OP inside the superconductor as a result of repeated Andreev reflections alone, without involving specular reflection and thus the OP sign reversal in momentum-space [see Fig.…”

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confidence: 99%

Spectroscopic signatures of the Larkin-Ovchinnikov state in the conductance characteristics of a normal-metal/superconductor junction

Cui

Wei

et al. 2012

Phys. Rev. B

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Using a discrete-lattice approach, we calculate the conductance spectra between a normal-metal and an s-wave Larkin-Ovchinnikov (LO) superconductor, with the junction interface oriented along the direction of the order parameter (OP) modulation. The OP sign reversal across one single nodal line can induce a sizable number of zero-energy Andreev bound states around the nodal line, and a hybridized midgap-states band is formed amid a momentum-dependent gap as a result of the periodic array of nodal lines in the LO state. This band-in-gap structure and its anisotropic properties give rise to distinctive features in both the point-contact and tunneling spectra as compared with the BCS and Fulde-Ferrell cases. These spectroscopic features can serve as distinguishing signatures of the LO state.

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“…We note that similar zero bias peak in the conductance spectrum has been reported as a signature of d-wave superconductivity in many superconductors including cuprates 23,24 and PuCoGa 5 . 25 In such studies, the zero-bias peak is regarded as evidence for a finite quasiparticle density of states FIG.…”

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confidence: 72%

Unconventional Andreev reflection on the quasi-one-dimensional superconductor Nb2PdxSe5

et al. 2016

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We have carried out Andreev reflection measurements on point contact junctions between normal metal and single crystals of the quasi-one-dimensional (Q1D) superconductor Nb2PdxSe5 (Tc ∼ 5.5 K). The contacts of the junctions were made on either self-cleaved surfaces or crystal edges so that the current flow directions in the two types of junctions are different, and the measurements provide a directional probe for the order parameter of the superconductor. Junctions made in both configurations show typical resistances of ∼20-30 Ohms, and a clear double-gap Andreev reflection feature was consistently observed at low temperatures. Quantitative analysis of the conductance spectrum based on a modified Blonder-Tinkham-Klapwijk (BTK) model suggests that the amplitudes of two order parameters may have angular dependence in the a-c plane. Moreover, the gap to transition temperature ratio (Δ/TC) for the larger gap is substantially higher than the BCS ratio expected for phonon-mediated s-wave superconductors. We argue that the anisotropic superconducting order parameter and the extremely large gap to transition temperature ratio may be associated with an unconventional pairing mechanism in the inorganic Q1D superconductor.

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Directional Tunneling and Andreev Reflection onYBa2Cu3O7

Abstract: 2 Boeing Phantom Works, Seattle, Washington 98124 the generalized BTK theory, with b as the tunnel-cone width, Z the barrier strength, D 0 the d-wave gap maximum, and 2D 0 ͞k B T c the reduced-gap ratio.

Cited by 389 publications

References 39 publications

Local and macroscopic tunneling spectroscopy ofY1−xCaxBa<

Local and macroscopic tunneling spectroscopy ofY1−xCaxBa<

Spectroscopic signatures of the Larkin-Ovchinnikov state in the conductance characteristics of a normal-metal/superconductor junction

Unconventional Andreev reflection on the quasi-one-dimensional superconductor Nb2PdxSe5

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