Journal
PHYSICAL REVIEW B
Volume 89, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.224504
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Funding
- Forschungskredit UZH [57161402]
- AFOSR MURI on superconductivity [FA9550-09-1-0953]
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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 (4) over bar 3m and the unit cell dimension a = 7.568 95(4) angstrom. We find that Ca3Ir4Ge4 is a superconductor with a critical temperature of T-c approximate to 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 T-c with Delta C/T-c approximate to 38 mJ mol(-1) K-2. Well above T-c, 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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