态密度精细特征在KOs2O6输运性质中的表现
Manifestations of fine features of the density of states in the transport properties of KOs2O6
摘要：
我们进行了高品质的KOs 2 O 6，β-烧绿石超导体单晶的高压输运测量。虽然高温下的电阻率可能接近饱和，但在低温下没有饱和的迹象，直到超导相。异常电阻率伴随着热电功率（TEP）的非金属行为，温度至少为700 K，也表现出一个宽的驼峰，在60 K的最大值。压力主要影响低能电子激发。一个简单的带模型的基础上增强态密度在一个狭窄的窗口周围的费米能量（EF）解释了这种非常规行为的主要特点，在输运系数和它的演变压力。
英文摘要：
We performed high-pressure transport measurements on high-quality single crystals of KOs2O6, a beta-pyrochlore superconductor. While the resistivity at high temperatures might approach saturation, there is no sign of saturation at low temperatures, down to the superconducting phase. The anomalous resistivity is accompanied by a nonmetallic behavior in the thermoelectric power (TEP) up to temperatures of at least 700 K, which also exhibits a broad hump with a maximum at 60 K. The pressure influences mostly the low-energy electronic excitations. A simple band model based on enhanced density of states in a narrow window around the Fermi energy (EF) explains the main features of this unconventional behavior in the transport coefficients and its evolution under pressure.
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