NMR compared to band structure calculations of the quaternary superconductor La3Ni2B2N3−x
Martin W. Pieper, Herwig Michor, Tahir Ali
DOI 10.1103/PhysRevB.85.214510 · Physical Review B
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Abstract
We measured susceptibility and NMR spectra, spin-lattice, and spin-spin relaxation of 11B and 139La in the quaternary superconductor La3Ni2B2N3−x and compare these experimental results to full potential density functional theory band structure calculations. The electric field gradients (EFGs) at B and La sites clearly show that the N vacancies are restricted to the N(2b) sublattice. Temperature-dependent susceptibility, Knight shift, and nuclear spin-lattice relaxation T1 are successfully described within the Fermi-liquid model. The Hebel-Slichter peak is suppressed in the mixed state and in the presence of paramagnetic impurities.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3Ni2B2N3-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.4 | Pressure not reported | onset |
| La3Ni2B2N3-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.5 | Pressure not reported | onset |
| RNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | unknown |
| YNi2B2C 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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