Point-contact spectroscopy investigation of superconducting-gap anisotropy in the nickel borocarbide compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LuNi</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">C</mml:mi></mml:mrow></mml:mrow></mml:math>

Bobrov, N. L.; Beloborod'ko, S.I.; Tyutrina, L. V.; Yanson, I. K.; Naugle, D. G.; Rathnayaka, K. D. D.

doi:10.1103/physrevb.71.014512

Cited by 32 publications

(55 citation statements)

References 23 publications

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“…This study is a logical extension of 19 . It was shown that the one-gap approximation could not provide an accurate description of the experimental curves in the low temperatures region and use of the two-gap approach was contemplated.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the superconducting energy gap in the compound LuNi2B2C by the method of point contact spectroscopy: two-gap approximation

Bobrov

Beloborod'ko

Tyutrina

et al. 2006

Low Temperature Physics

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It is shown that the two-gap approximation is applicable for describing the dV /dI(V ) spectra of LuNi2B2C-Ag point contacts in a wide interval of temperatures. The values and the temperature dependences of the large and the small gaps in the ab plane and in the c direction were estimated using the generalized BTK model 20 and the equations of. 21 In the BCS extrapolation the critical temperature of the small gap is 10 K in the ab plane and 14.5 K in the c direction. The absolute values of the gaps are ∆ ab 0 = 2.16 meV and ∆ c 0 = 1.94 meV . For the large gaps the critical temperature coincides with the bulk Tc, T bulk c = 16.8 K, and their absolute values are very close, being about 3 meV in both orientations. In the c direction the contributions to the conductivity from the small and the large gaps remain practically identical up to 10 ÷ 11 K. In the ab plane the contribution from the small gap is much smaller and decreases rapidly as a temperature rises.

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Section: Introductionmentioning

confidence: 99%

Investigation of the superconducting energy gap in the compound LuNi2B2C by the method of point contact spectroscopy: two-gap approximation

Bobrov

Beloborod'ko

Tyutrina

et al. 2006

Low Temperature Physics

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“…When this scattering is absent, τ s tends to infinity and the equation describing the current-voltage characteristics (IVCs) [20] coincides with the corresponding equation of the classical BTK theory [27]. The equations describing the IVCs of PCs within this model are presented in [20,24].…”

Section: Resultsmentioning

confidence: 99%

“…deviations F between the shapes of experimental curves (see [24], Fig.3) faces a certain problem: when the magnitudes of Γ and the gap ∆ become comparable, the error curve for ∆ has no distinct minimum, which is most typical of the c-direction (see Appendix, Fig.18). …”

Section: One-gap Approximationmentioning

confidence: 99%

“…As an example, we consider the spectrum from Fig. 14 in [24]. The gap is distributed in the interval 1-3.35 meV (insert).…”

Section: Some Details Of Calculation Techniquementioning

confidence: 99%

“…This expression was used to fit experimental curves and to derive the parameters ∆ 1,2 , Γ 1,2 (or γ 1,2 ), Z, S and K. The calculation technique is detailed in [24], Appendix. The average gap is found from the expression…”

Section: Two-gap Approximationmentioning

confidence: 99%

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Observation of an anisotropic effect of antiferromagnetic ordering on the superconducting gap in ErNi2B2C

Bobrov

Chernobay

Naǐdyuk

et al. 2010

Low Temperature Physics

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The point-contact (PC) spectra of the Andreev reflection dV /dI curves of the superconducting rare-earth nickel borocarbide ErNi2B2C (Tc ≈11 K) have been analyzed in the "one-gap" and "two-gap" approximations using the generalized Blonder-Tinkham-Klapwijk (GBTK) model and the Beloborod'ko (BB) model allowing for the pair-breaking effect of magnetic impurities. Experimental and calculated curves have been compared not only in shape, but in magnitude as well, which provide more reliable data for determining the temperature dependence of the energy gap (or superconducting order parameter) ∆(T). The anisotropic effect of antiferromagnetic ordering at TN ≈6 K on the superconducting gap/order parameter has been determined: as the temperature is lowered, ∆ decreases by ∼25% in the c-direction and only by ∼4% in the ab-plane. It is found that the pair-breaking parameter increases in the vicinity of the magnetic transitions, the increase being more pronounced in the c-direction. The efficiency of the models was tested for providing ∆(T) data for ErNi2B2C from Andreev reflection spectra.

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Rare–Earths–Nickel–Boron Compounds

Burzo¹

2023

Rare Earths-Transition Metals-Boron Compounds

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Point-contact spectroscopy investigation of superconducting-gap anisotropy in the nickel borocarbide compoundLuNi2B2C

Cited by 32 publications

References 23 publications

Investigation of the superconducting energy gap in the compound LuNi2B2C by the method of point contact spectroscopy: two-gap approximation

Investigation of the superconducting energy gap in the compound LuNi2B2C by the method of point contact spectroscopy: two-gap approximation

Observation of an anisotropic effect of antiferromagnetic ordering on the superconducting gap in ErNi2B2C

Rare–Earths–Nickel–Boron Compounds

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