对“Mo_3Sb_7超导性质的μ子自旋旋转研究”的评论，物理评论B 78，172505（2008）
Comment on ``Muon-spin rotation studies of the superconducting properties of Mo_3Sb_7'', Phys.Rev.B 78, 172505 (2008)
摘要：
在最近的一篇文章中，Tran等人[Phys.Rev.B78，172505（2008）]报道了Mo_3Sb_7超导体的μ子自旋旋转（\muSR）测量结果。通过对高斯弛豫速率σ_{sc}随温度和磁场变化的分析，认为Mo_3Sb_7是具有两个各向同性类s波带隙的超导体。从早先发表的比热数据中获得了额外的证实，这些数据部分是由同一组作者在[Acta Mater. 56，5694（2008）]。本文的目的是指出，根据Tran等人的分析，Mo_3Sb_7中存在两个超导能隙是不合理的。对\muSR数据的分析不能解释σ_{sc}随温度升高而减小的情况，因此，得出的磁穿透深度信息不准确。比热数据可以满意地描述在框架内的一个间隙模型与小的剩余比热分量。Tran等人的实验数据，以及我们早期发表的\muSR数据[Phys.Rev.B78，014502（2008）]似乎都与在Mo_3Sb_7中存在单一各向同性超导能隙相一致。
英文摘要：
In a recent article Tran et al. [Phys. Rev.B 78, 172505 (2008)] report on the result of the muon-spin rotation (\muSR) measurements of Mo_3Sb_7 superconductor. Based on the analysis of the temperature and the magnetic field dependence of the Gaussian relaxation rate σ_{sc} they suggest that Mo_3Sb_7 is the superconductor with two isotropic s-wave like gaps. An additional confirmation was obtained from the specific heat data published earlier by partly the same group of authors in [Acta Mater. 56, 5694 (2008)]. The purpose of this Comment is to point out that from the analysis made by Tran et al. the presence of two superconducting energy gaps in Mo_3Sb_7 can not be justified. The analysis of \muSR data does not account for the reduction of σ_{sc} with increasing temperature, and, hence, yields inaccurate information on the magnetic penetration depth. The specific heat data can be satisfactory described within the framework of the one-gap model with the small residual specific heat component. The experimental data of Tran et al., as well as our earlier published \muSR data [Phys. Rev. B 78, 014502 (2008)] all seem to be consistent with is the presence of single isotropic superconducting energy gap in Mo_3Sb_7.
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