Superconductivity in the ternary germanide La3Pd4Ge4
H. Fujii, T. Mochiku, H. Takeya, A. Sato
DOI 10.1103/PhysRevB.72.214520 · Physical Review B
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Abstract
The ternary germanide La3Pd4Ge4 has been prepared by arc melting. This compound takes a body-centered lattice with an orthorhombic unit cell with the lattice parameters of a=4.2200(3)Å,b=4.3850(3)Å, and c=25.003(2)Å. The crystal structure of La3Pd4Ge4 is U3Ni4Si4-type with the space group of Immm, consisting of the combination of structural units of AlB2-type and BaAl4-type layers. This compound is a type-II superconductor with a critical temperature (Tc) of 2.75 K. The lower critical field Hc1(0) is estimated to be 54 Oe. The upper critical field Hc2(0) estimated by linear extrapolation of the Hc2(T) curves is about 4.0 kOe, whereas the Werthamer-Hefland-Hohemberg theory gives Hc2(0)WHH=3.0kOe. This is an interesting observation of superconductivity in the compounds with U3Ni4Si4-type structure. The coherence length ξ(0) of 330 Å and the penetration depth λ(0) of 2480 Å are derived.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3Pd4Ge4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.75 | Pressure not reported | onset |
| LaPd2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.12 | Pressure not reported | unknown |
| LaPt2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.55 | Pressure not reported | unknown |
| YPd2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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