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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Electrical and thermal transport properties of intermediate-valence YbAl3
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Electrical and thermal transport properties of intermediate-valence YbAl3

机译：中价YbAl3的电和热输运性质

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Intermediate valence compound YbAl3 has been synthesized by the Bridgman method. Temperature dependence of the Seebeck coefficient, electrical resistivity and thermal conductivity has been measured on YbAl3 hot-pressed and single crystal samples. At temperatures below 100 K, the electrical resistivity exhibits a rho(T) = rho(0) + AT(2) dependence, while over the temperature range 300-800 K YbAl3 exhibits metallic behaviour with a linear temperature dependence of the electrical resistivity. The Seebeck coefficient exhibits a temperature dependence typical for heavy fermion compounds and attains a maximum of its absolute value of -79 muV K-1 at around 200-250 K. Combination of a large Seebeck coefficient and low residual resistivity of single crystalline YbAl3 leads to the highest ever reported electrical power factor of 340 x 10(-6) W cm(-1) K-2 at 80 K. Thermal conductivity as a function of temperature has a broad peak at 50 K, which originated mainly from the electronic contribution to thermal conductivity. At 300 K the total thermal conductivity of hot-pressed samples ranges from 0.085 to 0.179 W cm(-1) K-1 depending on the density of the samples. The calculated figure of merit value attains its maximum of 1 X 10(-3) K-1 at 100-120 K. [References: 12]
机译：通过Bridgman方法合成了中价化合物YbAl3。在YbAl3热压和单晶样品上测量了塞贝克系数，电阻率和热导率的温度依赖性。在低于100 K的温度下，电阻率表现出rho（T）= rho（0）+ AT（2）依赖性，而在300-800 K的温度范围内，YbAl3表现出金属行为，电阻率呈线性温度依赖性。塞贝克系数表现出典型的温度依赖性，适用于重铁金属化合物，并且在约200-250 K时达到-79 muV K-1的绝对值最大值。大塞贝克系数和低电阻率的单晶YbAl3的组合会导致报告的最高功率因数在80 K时为340 x 10（-6）W cm（-1）K-2。作为温度的函数的热导率在50 K处具有较宽的峰值，这主要来自电子贡献导热系数。在300 K下，热压样品的总热导率范围为0.085至0.179 W cm（-1）K-1，具体取决于样品的密度。计算出的品质因数值在100-120 K时达到最大值1 X 10（-3）K-1。[参考：12]

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