Isotope effect in LixZrNCl superconductors
Y. Taguchi, T. Kawabata, T. Takano, A. Kitora, K. Kato, M. Takata, Y. Iwasa
DOI 10.1103/PhysRevB.76.064508 · Physical Review B
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Abstract
The N-isotope effect has been investigated for a series of layered superconductors LixZrNCl with small carrier density. The N-vibration phonon mode around 615cm−1 interacting most strongly with electronic system has shown softening by about 20cm−1 (=3.3%) upon N15 substitution. On the other hand, the decrease in the superconducting critical temperature (Tc) upon N15 substitution has been found to be only 0.06±0.03K (=0.5±0.3%). This small change in Tc corresponds to an isotope shift coefficient α=0.07±0.04, which is much smaller than the conventional value of 0.5, implying the relevance of other fluctuations than the phonon to the pairing interaction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LixZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
| LixHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
| Li0.12ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LixZrN14Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
| LixZrN15Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.94 | Pressure not reported | onset |
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