4.3 Article

115In-NQR study of heavy-fermion superconductors Ce2MIn8 (M = Co, Rh)

Journal

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 76, Issue 12, Pages -

Publisher

PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.76.124703

Keywords

nuclear quadrupole resonance; heavy fermion; superconductivity; dimensionality; quantum critical point

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Ce2MIn8 (M = Co, Rh) are heavy-fermion compounds: at ambient pressure, Ce2CoIn8 is a superconductor with T-SC = 0.4 K and Ce2RhIn8 is an antiferromagnet with T-N = 2.8 K and Ce2RhIn8 becomes superconducting below 1.4K at 2.0GPa. Their crystal structure can be viewed as successive layers of the heavy-fermion compounds CeMIn5 and CeIn3. In order to determine their physical properties, we perform a nuclear quadrupole resonance (NQR) measurement of In-115 nuclei of Ce2MIn8. The spin-lattice relaxation rate 1/T-1 of Ce2COIn8 decreases with decreasing temperature T and is proportional to T through T-SC. This is in contrast to the T-1/2 dependence of the 1/T-1 of pressurized Ce2RhIn8 above T-SC.

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