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Superconductivity and correlated Fermi liquid behavior in noncentrosymmetric Ca3Ir4Ge4

Publication date2014-06-06
First online date2014-06-06
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 I¯43m 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.

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Citation (ISO format)
VON ROHR, Fabian et al. Superconductivity and correlated Fermi liquid behavior in noncentrosymmetric Ca<sub>3</sub>Ir<sub>4</sub>Ge<sub>4</sub>. In: Physical review. B, Condensed matter and materials physics, 2014, vol. 89, n° 22, p. 224504. doi: 10.1103/PhysRevB.89.224504
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ISSN of the journal1098-0121
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