| Summary: | 碩士 === 國立中山大學 === 物理學系研究所 === 94 === Magnetic dependence of low temperature specific heat down to 0.6K is used to investigate the pairing symmetry of unconventional superconductor CeRu2. At low temperature Debye model highly deviated the 8T data serving as normal state below small magnetic anomaly shown around 6K.
Based on the entropy conservation of superconducting transition, superconducting order parameters of s-wave and d-wave could not both be well described specific heat data at zero field. However, two-gap model, ΔS=0.80 meV and ΔL=1.01 meV, is better to describe the pairing symmetry of CeRu2. This might be the controversies among the earlier reports.
Magnetic susceptibility and resistance under magnetic filed are both used to investigate the small anomaly, excluding double superconducting phase. Moreover, two rounds of specific-heat measurement both show the magnetic anomaly and might lead to an intrinsic property.
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