Specific heat in high magnetic fields and non-Fermi-liquid behavior in CeMIn{sub 5} (M=Ir, Co)
The low-temperature specific heat, in magnetic fields to 32 T, and the magnetic susceptibility are reported on single crystals of the new heavy-fermion superconductors CeMIn{sub 5}, M=Ir and Co, as well as the new heavy-fermion antiferromagnet CeRhIn{sub 5}. The absence of a pronounced field dependence to the specific heat of the Ir and Co systems suggests that the large Sommerfeld coefficients of these compounds are due to correspondingly large effective electron masses. In addition, the indicated non-Fermi-liquid behavior previously suggested from the temperature dependence of the resistivity of CeIrIn{sub 5} has been confirmed in our measurements of the susceptibility and specific heat for this compound, as well as in the susceptibility and specific heat of CeCoIn{sub 5}. The existence of superconductivity in these systems that appears, based on their non-Fermi-liquid behavior, to develop near a quantum critical point is further support for this superconductivity being of unconventional nature.
- Sponsoring Organization:
- (US)
- DOE Contract Number:
- FG05-86ER45268
- OSTI ID:
- 40277660
- Journal Information:
- Physical Review B, Vol. 64, Issue 13; Other Information: DOI: 10.1103/PhysRevB.64.134524; Othernumber: PRBMDO000064000013134524000001; 065137PRB; PBD: 1 Oct 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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