Point-contact Andreev reflection spectroscopy of a magnetic superconductor Dy₀.₆Y₀.₄Rh₃.₈₅Ru₀.₁₅B₄

• Date: 2012
• Main Authors: Rybaltchenko, L.F., Khristenko, E.V., Ishchenko, L.A., Terekhov, A.V., Zolochevskii, I.V., Salenkova, T.V., Khlybov, E.P., Zaleski, A.J.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2012
• Series: Физика низких температур
• Subjects: Свеpхпpоводимость, в том числе высокотемпеpатуpнаям
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/117971
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Point-contact Andreev reflection spectroscopy of a magnetic superconductor Dy₀.₆Y₀.₄Rh₃.₈₅Ru₀.₁₅B₄ / L.F. Rybaltchenko, E.V. Khristenko, L.A. Ishchenko, A.V. Terekhov, I.V. Zolochevskii, T.V. Salenkova, E.P. Khlybov, A.J. Zaleski // Физика низких температур. — 2012. — Т. 38, № 12. — С. 1403–1409 . — Бібліогр.: 31 назв. — англ.

The Andreev reflection spectra dI/dV(V) of the magnetic superconductor Dy₀.6Y₀.₄Rh₃.₈₅Ru₀.₁₅B₄ have been investigated. Pronounced stimulation of superconductivity by an external magnetic field has been observed for the first time. The effect showed up as enhancement of the gap structure (and hence the gap itself) in the spectra and its shift towards higher voltages with an increasing field. In the intermediate fields the structure also behaved strangely: instead of the usual smooth decrease with a grooving field, the gap features dropped abruptly near the critical point Hc₂. Of interest is also the abnormally high relative gap value 2∆/kBTc ≈ 4 (as compared to conventional singlet superconductors) which was found for some contacts from a comparison of experimental spectra and the modified Blonder–Tinkham–Klapwiyk theory. We attribute the features revealed in the point-contact spectroscopic investigations of Dy₀.6Y₀.₄Rh₃.₈₅Ru₀.₁₅B₄ in a magnetic field to the triplet-type Cooper pairing in the compound because only in this case one can expect the stimulation of superconductivity in the stationary magnetic fields up to ~ 0.7Hc₂.