Reduction in the electron density of states in superconducting MgB2 disordered by neutron irradiation: 11B and 25Mg NMR estimates
A. P. Gerashenko, K. N. Mikhalev, S. V. Verkhovskii, A. E. Karkin, B. N. Goshchitskii
DOI 10.1103/PhysRevB.65.132506 · Physical Review B
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Abstract
The NMR line shift and nuclear spin-lattice relaxation rate T1−1 of 11B and 25Mg were measured in superconducting MgB2(Tcons=38K) structurally disordered by nuclear reactor neutrons up to the fluence of thermal neutrons Φ=1×1019cm−2. The temperature of the superconducting transition was shifted down to Tc,irradons=7K under irradiation. The change due to irradiation in the partial electron density of states (DOS) at the Fermi energy of boron and magnesium were traced by taking into account that the T1−1 of 11B and 25Mg is determined by hyperfine magnetic interactions with carriers. It was revealed that electronic states near EF of Mg are influenced negligibly by irradiation whereas the partial DOS of the B 2px,y states reduce greatly in irradiated MgB2. Acording to the Mc Millan formula, NMR data show that critical temperature decreases in irradiated MgB2 mainly due to a reduction in the partial DOS of p states of boron.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | onset |
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