Enhancement of Pairing Interaction and Magnetic Fluctuations toward a Band Insulator in an Electron-Doped LixZrNCl Superconductor
Yuichi Kasahara, Tsukasa Kishiume, Takumi Takano, Katsuki Kobayashi, Eiichi Matsuoka, Hideya Onodera, Kazuhiko Kuroki, Yasujiro Taguchi, Yoshihiro Iwasa
DOI 10.1103/PhysRevLett.103.077004 · Physical Review Letters
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Abstract
The doping dependence of specific heat and magnetic susceptibility has been investigated for LixZrNCl superconductors derived from a band insulator. As the carrier concentration is decreased, the anisotropy of superconducting gap changes from highly anisotropic to almost isotropic. It was also found that, upon reducing carrier density, the superconducting coupling strength and the magnetic susceptibility are concomitantly enhanced in parallel with Tc, while the density of states at the Fermi level is kept almost constant. Theoretical calculations taking into account the on-site Coulomb interaction reproduced the experimental results, suggesting a possible pairing mediated by magnetic fluctuations, even in the doped band insulators.
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. | 14 | Pressure not reported | unknown |
| LixZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.6 | Pressure not reported | unknown |
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (BEDT-TTF)2Cu[N(CS)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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