Evidence of gap anisotropy in superconducting YNi2B2C using directional point contact spectroscopy
P. Raychaudhuri, D. Jaiswal-Nagar, Goutam Sheet, S. Ramakrishnan, and, H. Takeya
TL;DR
This study uses directional point contact spectroscopy to reveal significant anisotropy in the superconducting energy gap of YNi2B2C, indicating different gap magnitudes and temperature behaviors along different crystal directions.
Contribution
It provides direct experimental evidence of gap anisotropy in YNi2B2C using directional spectroscopy, supporting an s+g symmetry scenario.
Findings
Superconducting gap is 4.5 times larger along c-axis than in the a-axis at 2.7K.
Energy gaps exhibit different temperature dependences in different directions.
Results support an s+g like symmetry of the superconducting order parameter.
Abstract
We present a study of the anisotropy in the superconducting energy gap in a single crystal of YNi2B2C (Tc~14.6K) using directional point contact spectroscopy. The superconducting energy gap at 2.7K, when measured for I||c, is 4.5 times larger than that for I||a. The energy gaps in the two directions also have different temperature dependences. Our results support a scenario with s+g like symmetry.
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