Unusual behavior of nuclear relaxation in CeCu2Si2 “possible evidence for triplet superconductivity” |
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| Authors: | Yoshio Kitaoka Koh-ichi Ueda Takao Kohara Kunisuke Asayama |
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| Institution: | 1. Faculty of Science, Kobe University, Nada-Ku, Kobe 657, JAPAN;2. Division of Science of Materials, Graduate School of Science and Technology, Kobe University, Nada-Ku, Kobe 657, JAPAN;3. College of Liberal Arts, Kobe University, Nada-Ku, Kobe 657, JAPAN |
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| Abstract: | Nuclear relaxation of 63Cu in the superconducting state of the Kondo-lattice system CeCu2Si2 has been studied with the use of the 63Cu nuclear quadrupole resonance technique under zero field and down to 65mK. The nuclear spin-lattice relaxation rate (1/T1) decreases drastically just below Tc=0.67 K down to 0.5Tc without the apparent enchanced behavior and then is found to be almost temperature independent below 0.3Tc. These results suggest that the superconductivity in CeCu2Si2 is not in the usual BCS regime. The analysis based upon the existing triplet pairing model with an anisotropic energy gap describes well the behavior from Tc down to 0.5Tc, while the temperature independence below 0.3Tc remains unexplained. |
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