MgB2 single crystals substituted with Li and with Li-C: Structural and superconducting properties
J. Karpinski, N. D. Zhigadlo, S. Katrych, K. Rogacki, B. Batlogg, M. Tortello, R. Puzniak
DOI 10.1103/PhysRevB.77.214507 · Physical Review B
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Abstract
The effect of Li substitution and Li-C co-substitution on the superconducting properties and crystal structure of MgB2 single crystals has been investigated. Hole doping with Li decreases the superconducting transition temperature Tc at a slower rate than that of the electron doping with C or Al. For crystals co-substituted with Li for Mg and C for B, Tc decreases more rapidly than for crystals substituted with C alone. This means that holes introduced with Li cannot counterbalance the influence of electrons doped with C and are not able to prevent Tc to decrease. The possible explanation is that holes coming from Li occupy mainly the π band while electrons coming from C fill the σ band. The resistivity in both Li substituted and Li-C co-substituted crystals is significantly increased, reflecting scattering due to substitutional defects, including distortion of the lattice. Li substitution decreases the upper critical field Hc2(T)∥ab while Hc2(T)∥c does not change. The temperature dependences of Hc2 for the Li and Al single-substituted crystals with the same Tc show a similar Hc2(T) behavior despite the different substitution level.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Mg0.98B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.5 | Pressure not reported | onset |
| Mg0.98B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.4 | Pressure not reported | midpoint |
| Mg0.95Li0.05B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.5 | Pressure not reported | onset |
| Mg0.95Li0.05B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.25 | Pressure not reported | midpoint |
| Mg0.90Li0.10B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.6 | Pressure not reported | onset |
| Mg0.90Li0.10B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.55 | Pressure not reported | midpoint |
| Mg0.89Li0.11B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.8 | Pressure not reported | onset |
| Mg0.89Li0.11B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.3 | Pressure not reported | midpoint |
| Mg0.94Li0.06B1.96C0.04 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.8 | Pressure not reported | onset |
| Mg0.94Li0.06B1.96C0.04 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.6 | Pressure not reported | midpoint |
| Mg0.91Li0.09B1.84C0.16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.6 | Pressure not reported | onset |
| Mg0.91Li0.09B1.84C0.16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.15 | Pressure not reported | midpoint |
| Mg0.90Li0.10B1.82C0.18 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.9 | Pressure not reported | onset |
| Mg0.90Li0.10B1.82C0.18 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.5 | Pressure not reported | midpoint |
| Mg0.89Li0.11B1.88C0.12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.2 | Pressure not reported | onset |
| Mg0.89Li0.11B1.88C0.12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29.9 | Pressure not reported | midpoint |
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