Anomalous magnetic-field tunneling of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>junctions: Possible detection of non

Kashiwaya, Hiromi; Kashiwaya, Satoshi; Prijamboedi, Bambang; Sawa, Akihito; Kurosawa, I.; Tanaka, Yukio; Iguchi, Ienari

doi:10.1103/physrevb.70.094501

Cited by 28 publications

(13 citation statements)

References 30 publications

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“…43,44 It was demonstrated that the formation of MARS in DN/ d-wave superconductor ͑DN/ d͒ junctions strongly competes with the proximity effect. Remarkable recent advances in experiments on tunneling in high T C cuprates 42 stimulate an interest to the problem of an influence of the magnetic impurity scattering on a charge transport in DN/ d junctions.…”

Section: Introductionmentioning

confidence: 99%

Influence of magnetic impurities on charge transport in diffusive-normal-metal/superconductor junctions

et al. 2005

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Charge transport in the diffusive normal metal ͑DN͒/insulator/s-and d-wave superconductor junctions is studied in the presence of magnetic impurities in DN in the framework of the quasiclassical Usadel equations with the generalized boundary conditions. The cases of s-and d-wave superconducting electrodes are considered. The junction conductance is calculated as a function of a bias voltage for various parameters of the DN metal, resistivity, Thouless energy, the magnetic impurity scattering rate, and the transparency of the insulating barrier between DN and a superconductor. It is shown that the proximity effect is suppressed by magnetic impurity scattering in DN for any value of the barrier transparency. In low-transparent s-wave junctions this leads to the suppression of the normalized zero-bias conductance. In contrast to that, in high transparent junctions zero-bias conductance is enhanced by magnetic impurity scattering. The physical origin of this effect is discussed. For the d-wave junctions, the dependence on the misorientation angle ␣ between the interface normal and the crystal axis of a superconductor is studied. The zero-bias conductance peak is suppressed by the magnetic impurity scattering only for low transparent junctions with ␣ ϳ 0. In other cases the conductance of the d-wave junctions does not depend on the magnetic impurity scattering due to strong suppression of the proximity effect by the midgap Andreev resonant states.

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Section: Introductionmentioning

confidence: 99%

Influence of magnetic impurities on charge transport in diffusive-normal-metal/superconductor junctions

et al. 2005

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“…Indeed, the zero-energy flat bands at the (110) surface of d -wave superconductors with time-reversal symmetry (TRS) [29] are predicted to be unstable towards a time-reversalsymmetry-breaking (TRSB) state [22][23][24][25][26][27][28]30]. This has been supported by some tunneling and transport experiments [31][32][33] but was not seen in others [34][35][36][37][38]. d -wave superconductors are however qualitatively different from NCSs in that the zero-energy flat bands are degenerate in the first case but nondegenerate in the second.…”

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Surface instability in nodal noncentrosymmetric superconductors

2015

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We study the stability of topologically protected zero-energy flat bands at the surface of nodal noncentrosymmetric superconductors, accounting for the alteration of the gap near the surface. Within a selfconsistent mean-field theory, we show that the flat bands survive in a broad temperature range below the bulk transition temperature. There is a second transition at a lower temperature, however, below which the system spontaneously breaks time-reversal symmetry. The surface bands are shifted away from zero energy and become weakly dispersive. Simultaneously, a spin polarization and an equilibrium charge current develop in the surface region.

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“…As a reference, the tunneling conductance spectrum of a (110)-oriented YBa 2 Cu 3 O 7−δ junction described in Ref. [18] is shown in Fig. 3(d).…”

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“…(d) Experimental spectra obtained on an YBa 2 Cu 3 O 7−δ (YBCO) junction at 3 K cited from Ref. [18]. We normalize the vertical axis by the normal-state value and the horizontal axis by 18 mV.…”

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Edge States ofSr2RuO4Detected by In-Plane Tunneling Spectroscopy

et al. 2011

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We perform tunneling spectroscopy of Sr 2 RuO 4 searching for the edge states peculiar to topological superconductivity. Conductance spectra obtained on Sr 2 RuO 4 /Au junctions fabricated using in situ process show broad humps indicating the successful detection of a-axis edge of 1.5K phase. Three types of peak shape are detected: domelike peak, split peak and two-step peak. By comparing the experiments with predictions for unconventional superconductivity, these varieties are shown to originate from multiband chiral p-wave symmetry with weak anisotropy of pair amplitude. The broad hump in conductance spectrum is a direct manifestation of the edge state peculiar to the chiral p-wave superconductivity.Since the discovery of the ruthenate superconductor Sr 2 RuO 4 (SRO) [1], the symmetry of the pair potential has been a topic of hot debate. The high anisotropy of transport properties indicates the quasi-two-dimensional electronic states of this compound. Nuclear magnetic resonance [2] and muon spin resonance experiments [3] suggest spin triplet pairing states with broken 1

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Anomalous magnetic-field tunneling ofYBa2Cu3O7−δjunctions: Possible detection of non

Cited by 28 publications

References 30 publications

Influence of magnetic impurities on charge transport in diffusive-normal-metal/superconductor junctions

Influence of magnetic impurities on charge transport in diffusive-normal-metal/superconductor junctions

Surface instability in nodal noncentrosymmetric superconductors

Edge States ofSr2RuO4Detected by In-Plane Tunneling Spectroscopy

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