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Superconductivity and correlated Fermi liquid behavior in noncentrosymmetric Ca 3 Ir 4 Ge 4

Author(s): von Rohr, Fabian; Luo, Huixia; Ni, Ni; Wörle, Michael; Cava, Robert Joseph

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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 I4̄3m and the unit cell dimension a=7.56895(4) Å. We find that Ca3Ir4Ge4 is a superconductor with a critical temperature of Tcâ‰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 Î"C/Tcâ‰38 mJ molâ1 Kâ2. 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. © 2014 American Physical Society.
Publication Date: Jun-2014
Electronic Publication Date: 6-Jun-2014
Citation: von Rohr, Fabian, Luo, Huixia, Ni, Ni, Wörle, Michael, Cava, Robert J. (2014). Superconductivity and correlated Fermi liquid behavior in noncentrosymmetric. Physical Review B, 89 (22), 10.1103/PhysRevB.89.224504
DOI: doi:10.1103/PhysRevB.89.224504
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 89.22:224504-1 - 224504-5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Physical Review B - Condensed Matter and Materials Physics. Volume 89, Issue 22, 6 June 2014, Article number 224504.

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