Two-dimensional (2D) correlation analysis is applied to the temperature dependence on the Raman spectra of superconducting YNi2B2C single crystal. 2D correlation analysis on the temperature dependence of the B1g superconducting gap peak shows strong correlation with the Ni B1g phonon peak near 200 cm-1. The analysis on the B 1g phonon peak itself shows that the peak is composed of essentially two peaks at 197 and 203 cm-1, and only the weight of the two peaks changes as the temperature changes. The result suggests that there are two distinctive environments of the Ni-B bonds in YNi2B2C system at the superconducting state.
Bibliographical noteFunding Information:
The authors thank P.C. Canfield for the YM2B2C single crystal samples, and I. Noda for the stimulating discussion that initiated the current work. ISY acknowledges the financial support from KOSEF through the 2003 Advanced Basic Research Laboratory (ABRL) program R14-2003-027-01001-0.
- Raman spectra
- Two-dimensional correlation analysis