Superconductivity and correlated Fermi liquid behavior in noncentrosymmetric Ca3Ir4Ge4
Fabian von Rohr, Huixia Luo, Ni Ni, Michael Wörle, Robert J. Cava
DOI 10.1103/PhysRevB.89.224504 · Physical Review B
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Abstract
We report the structure and the elementary physical properties of Ca3Ir4Ge4. This compound crystallizes in the cubic, noncentrosymmetric Na3Pt4Ge4 structure type with the space group I4¯3m and the unit cell dimension a=7.56895(4) Å. We find that Ca3Ir4Ge4 is a superconductor with a critical temperature of Tc≈1.8 K. The bulk character of the superconducting state is evidenced by the occurrence of a well developed discontinuity in the specific heat at Tc with ΔC/Tc≈38 mJ mol−1 K−2. Well above Tc, the compound is a weakly paramagnetic metal with Fermi liquid behavior. The low-temperature specific-heat and resistivity measurements reveal a Kadowaki-Woods ratio comparable to that of heavy fermion materials. Furthermore, the magnetization measurements show a Stoner enhancement factor of 0.57. These findings are indicators for significant electron-electron correlation in this compound.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca3Ir4Ge4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.7 | Pressure not reported | midpoint |
| Ca3Ir4Ge4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure not reported | zero_resistance |
| Ca3Ir4Ge4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure not reported | midpoint |
| LaIr2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | unknown |
| La3Ir2Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.7 | Pressure not reported | unknown |
| CeIrGe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.6 | 24 GPa | unknown |
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