Nb3Sn晶体的点接触光谱：与马氏体相变有关的CDW能隙的证据
Point Contact Spectroscopy of Nb3Sn Crystals: Evidence of a CDW Gap Related to the Martensitic Transition
摘要：
用点接触光谱法研究了两种在不同温度和形状下表现出马氏体异常的Nb_3Sn单晶的电子态密度结构特征。在马氏体异常以下的高温下，我们观察到不同的光谱特征。一个样品显示了一个很好的标记比热峰，示出了一个明确定义的结构，在微分电导随温度的变化，并可能与由于电荷密度波隙的开放状态密度的变化。这些特征很大程度上取决于所检查的单晶的晶体学特征。
英文摘要：
Two Single crystals of Nb3Sn presenting the martensitic anomaly at different temperature and shape, as observed with specific heat measurements, were used to study structural features in the electronic density of states with point contact spectroscopy. At high temperature below the martensitic anomaly, we observed different spectroscopic characteristics. One sample displaying a well marked specific heat peak, shows a clear defined structure in the differential conductance that evolves with temperature and may be associated with changes on the density of states due to the opening of a charge density wave gap. Those features are very depending on the crystallographics characteristics of the single crystal examined.
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