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arXiv 0802.2759cond-mat.str-el
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Specific Heat研究CePt3Si中的磁性和超导转变

Specific Heat Study of Magnetic and Superconducting Transitions in CePt3Si

Gaku Motoyama, Katsuhiro Maeda, Yasukage Oda

摘要:

对切割成小片(通常为$\sim $ 10 mg)的多晶CePt3Si样品进行80 mK至4 K之间的比热和80 mK至10 K之间的电阻率的测量。在比热测量中,我们观察到所有样品在TN = 2.2 K处的反铁磁转变跳跃,而高度有很大的变化。至于超导性,我们观察到两个明显的过渡跳跃在Tcl $\sim$ 0.45 K和Tch $\sim$ 0.75 K,这是相同的所有样品。从比热和电阻率的测量中,发现了反铁磁和超导转变之间的系统关系。结果表明,反铁磁性与超导性共存,反铁磁性的转变温度为2.2K,超导性的转变温度为Tcl。在该样品中,超导态$γ_{\rm s}$中的剩余电子比热系数相当小,并且比热除以Tcl以下的温度几乎随温度降低而线性降低。为了揭示CePt_3Si系统的磁性和超导电性的特征,重要的是分别研究Tcl和Tch的两个超导相。

英文摘要:

Measurements of specific heat between 80 mK to 4 K and electrical resistivity between 80 mK to 10 K were carried out for polycrystalline CePt3Si samples cut into small pieces (typically $\sim $10 mg). In the specific heat measurements, we observed an antiferromagnetic transition jump at TN = 2.2 K for all the samples, while the heights have large variations. As regards superconductivity, we observed two distinct transition jumps at Tcl $\sim$ 0.45 K and Tch $\sim$ 0.75 K, which were the same for all the samples. From the measurements of specific heat and resistivity, systematic relations were found between antiferromagnetic and superconducting transitions. We conclude that antiferromagnetism, whose transition temperature is 2.2 K, coexists with superconductivity, whose transition temperature is Tcl. In this sample, residual electronic specific heat coefficient in the superconducting state $γ_{\rm s}$ was quite small, and specific heat divided by temperature below Tcl decreased almost linearly with decreasing temperature. In order to reveal the characteristic properties of the magnetism and superconductivity of the CePt3Si system, it is important to study the two superconducting phases with Tcl and Tch, respectively.

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