Anomalous phonon peak in the superconducting state of ErNi211B2C

H. Kawano-Furukawa; H. Yoshizawa; H. Takeya; K. Kadowaki

doi:10.1103/PhysRevB.66.212503

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Anomalous phonon peak in the superconducting state of ErNi211B2C

H. Kawano-Furukawa, H. Yoshizawa, H. Takeya, K. Kadowaki

DOI 10.1103/PhysRevB.66.212503 · Physical Review B

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Abstract

An anomalous phonon peak that appears only in the superconducting state has been reported for nonmagnetic intermetallic superconductor RNi211B2C (R=Y, Lu). In the present paper, we shall demonstrate that another rare-earth borocarbide ErNi211B2C seems to show similar phonon anomalies. A spectral weight transfer from the above-lying TA phonon mode to the aforementioned peak was rather small, but it is consistent with the theoretical prediction for the system with smaller 2Δ/Eph ratio. Combining the present results with those observed in the other borocarbide systems, we suggest that such a phonon anomaly might be a common phenomenon for superconductors with a strong nesting feature of the Fermi surface.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
ErNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.6	Pressure not reported	midpoint
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14.2	Pressure not reported	unknown
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16.5	Pressure not reported	unknown