Increase of superconducting order parameter in the magnetic superconductor Dy0.6Y0.4Rh3.85Ru0.15B4 in a wide magnetic field range. Is it a further candidate in p-wave superconductors?

TL;DR

This study investigates the magnetic superconductor Dy0.6Y0.4Rh3.85Ru0.15B4, revealing that magnetic fields enhance its superconductivity and suggesting a possible triplet pairing mechanism, indicating potential p-wave superconductivity.

Contribution

First experimental study of Andreev reflection spectra in Dy0.6Y0.4Rh3.85Ru0.15B4 showing magnetic field-induced superconductivity enhancement and proposing triplet pairing.

Findings

Magnetic field up to 0.7 Hc2 stimulates superconductivity.

Observed gap ratio 2Δ/kBTc ≈ 4.0 exceeds conventional value.

Proposed triplet pairing mechanism in the superconductor.

Abstract

The Andreev reflection spectra were studied for the first time in the magnetic superconductor Dy0.6Y0.4Rh3.85Ru0.15B4. It is found that an external magnetic field (up to 0.7 Hc2) is a strong stimulator of superconductivity in contrast with traditional superconductors with a singlet pairing. The ratio 2\Delta/kBTc \approx 4.0 obtained for some contacts is higher than the value 3.52 which is typical of conventional superconductors with a weak electron-phonon interaction. It has been proposed that in Dy0.6Y0.4Rh3.85Ru0.15B4 a triplet mechanism of superconducting pairing is realized.