Superconducting properties of La3Ni2B2N3−δ
H. Michor, R. Krendelsberger, G. Hilscher, E. Bauer, C. Dusek, R. Hauser, L. Naber, D. Werner, P. Rogl, H. W. Zandbergen
DOI 10.1103/PhysRevB.54.9408 · Physical Review B
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Abstract
Nearly-single-phase La3Ni2B2N3−δ prepared by arc melting and subsequent annealing at 1100 °C is characterized by x-ray powder techniques, electron microprobe analysis, and high-resolution electron microscopy. A standardized set is provided for the crystallographic parameters, and structural chemistry is described from the point of view of nonmetal-nonmetal interactions as well as of the metal coordination around the nonmetal atoms. The superconducting properties of La3Ni2B2N3−δ are studied by means of resistivity, magnetization, and heat capacity measurements. The obtained critical fields μ0Hc(0)=0.16 T, μ0Hc1(0)=13(2) mT, and μ0Hc2(0)=7.5(5) T classify La3Ni2B2N3−δ as a hard type-II superconductor with a Ginzburg-Landau parameter κ=33(2), a coherence length ξ0=7.0(5) nm, and a penetration depth λ(0) of about 210 nm. The pressure dependence of Tc with dTc/dp=-130 mK/kbar is found to be one order of magnitude larger than for RNi2B2C (R=Y, Lu). Since the deviations of the thermodynamic ratios as ΔC/γTc, γTc2/Hc2(0), Hc(0)/Hc′(Tc)Tc, and Δ(0)/kBTc from their BCS values are rather small, La3Ni2B2N3−δ is characterized as a phonon-mediated weak- to medium-coupling BCS superconductor. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3Ni2B2N3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
| La3Ni2B2N3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
| La3Ni2B2N3-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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