Valence-band photoemission study of β−ZrNCl and the quasi-two-dimensional superconductor NaxZrNCl
T. Yokoya, T. Takeuchi, S. Tsuda, T. Kiss, T. Higuchi, S. Shin, K. Iizawa, S. Shamoto, T. Kajitani, T. Takahashi
DOI 10.1103/PhysRevB.70.193103 · Physical Review B
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Abstract
We have performed photoemission (PE) spectroscopy of β−ZrNCl and NaxZrNCl to study intercalation-induced change in the electronic structure. The valence band PE spectrum of β−ZrNCl shows a small intensity region within ∼2.5eV of EF with a very small hump at EF that can be ascribed to hydrogen impurity states. These provide spectroscopic evidence that β−ZrNCl is an n-type semiconductor. Upon Na intercalation, new states possibly involving hybridized Zr4d and N2p systematically evolve at EF, with a negligible shift in the valence band structures. Similar results in β−HfNCl and NaxHfNCl indicate that these results represent common electronic features of the layered nitride chloride superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
| LixHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.5 | Pressure not reported | unknown |
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