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arXiv 0901.2382cond-mat.str-el
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重费米子超导体CePt $_{3}$ Si的点接触光谱

Point-contact spectroscopy of the heavy-fermion superconductor CePt$_{3}$Si

R. Onuki, A. Sumiyama, Y. Oda, T. Yasuda, R. Settai, Y. Onuki

摘要:

测量了重费米子超导体CePt $_{3}$ Si与正常金属点接触的微分电阻谱(${\rm d}V/{\rm d}I-V$特性)。一些接触在V=0处显示出HFS的特征峰,该峰与诸如UPd $_2$ Al $_3$、UNi $_2$ Al $_3$和URu $_2$ Si $_2$的磁序共存。峰的演变发生在远高于反铁磁转变温度$T_{\rm N}\sim$ 2.2 K的温度,因此与磁转变的直接关系值得怀疑。峰的半宽似乎反映了晶体场分裂或自旋波间隙,如上述HFS所观察到的,可能表明一些常见的散射过程在这些材料中诱导零偏置峰。

英文摘要:

Differential resistance spectra (${\rm d}V/{\rm d}I-V$ characteristics) have been measured for point-contacts between the heavy-fermion superconductor (HFS) CePt$_{3}$Si and a normal metal. Some contacts show a peak at V=0 that is characteristic of HFS coexisting with a magnetic order such as UPd$_2$Al$_3$, UNi$_2$Al$_3$ and URu$_2$Si$_2$. The evolution of the peak occurs well above the antiferromagnetic transition temperature $T_{\rm N}\sim$ 2.2 K, so that the direct relationship with the magnetic transition is questionable. The half-width of the peak seems to reflect the crystal field splitting or the spin-wave gap as observed for the above-mentioned HFSs, possibly suggesting that some common scattering process induces the zero-bias peaks in these materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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