115In-NQR Study of Heavy-Fermion Superconductors Ce2MIn8 (M = Co, Rh)

Ce2MIn8 (M=Co, Rh) are heavy-fermion compounds: at ambient pressure, Ce2CoIn8 is a superconductor with TSC=0.4 K and Ce2RhIn8 is an antiferromagnet with TN=2.8 K and Ce2RhIn8 becomes superconducting below 1.4 K at 2.0 GPa. Their crystal structure can be viewed as successive layers of the heavy-fermi...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2007-12, Vol.76 (12)
Main Authors: FUKAZAWA, Hideto, OKAZAKI, Taishi, HIRAYAMA, Kenji, KOHORI, Yoh, CHEN, Genfu, OHARA, Shigeo, SAKAMOTO, Isao, MATSUMOTO, Takehiko
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Heavy-fermion superconductors
Physics
Properties of type I and type II superconductors
Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
Superconducting materials (excluding high-tc compounds)
Superconductivity
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Summary:Ce2MIn8 (M=Co, Rh) are heavy-fermion compounds: at ambient pressure, Ce2CoIn8 is a superconductor with TSC=0.4 K and Ce2RhIn8 is an antiferromagnet with TN=2.8 K and Ce2RhIn8 becomes superconducting below 1.4 K at 2.0 GPa. 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 115In nuclei of Ce2MIn8. The spin-lattice relaxation rate 1/T1 of Ce2CoIn8 decreases with decreasing temperature T and is proportional to T through TSC. This is in contrast to the T1/2 dependence of the 1/T1 of pressurized Ce2RhIn8 above TSC.
ISSN:0031-9015
1347-4073