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首页> 外文期刊>Journal of Applied Physics >Magnetotransport properties in near-stoichiometric hydride films of YH_(2+δ) under weak fields
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Magnetotransport properties in near-stoichiometric hydride films of YH_(2+δ) under weak fields

机译:YH_(2 +δ)近化学计量氢化物膜在弱磁场下的磁输运性质

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摘要

We have investigated the basic characteristics of mobile carriers in as-deposited thin films of hexagonal-close-packed Y and hydrogenated films of face-centered-cubic YH_(2+δ). Hall resistance and transverse magnetoresistance measurements were carried out under magnetic fields of up to 1 T at room temperature. The Hall coefficient in YH_(2+δ) showed a minimum value of ~5 X 10~(-12) m~3/C when the δ value reached ~-0.1, in accordance with the δ dependence of resistivity reported previously. Quantitative analysis based on the present measurements revealed that YH_(2+δ) is a compensated metal whose carrier density and mobility were determined to be ~1.4 X 10~(27) (~1.9 X 10~(27)) m~(-3) and ~3.5 X 10~(-3) (~3.1 X 10~(-3)) m~2 V~(-1) s~(-1), respectively, for δ = 0.04 (-0.03) for both electrons and holes. These carrier parameters were found to account concurrently for the reflection spectral line shapes observed. The compensation observed in YH_(2+δ) is at variance with a simple criterion used previously [E. Fawcett and W. A. Reed, Phys. Rev. 131, 2463 (1963)].
机译:我们研究了六方密堆积Y沉积薄膜和面心立方YH_(2 +δ)氢化薄膜中移动载流子的基本特性。在室温下在高达1 T的磁场下进行霍尔电阻和横向磁阻测量。根据先前报道的电阻率对δ的依赖性,当δ值达到〜-0.1时,YH_(2 +δ)中的霍尔系数显示出最小值为〜5 X 10〜(-12)m〜3 / C。根据目前的测量结果定量分析表明,YH_(2 +δ)是一种补偿金属,其载流子密度和迁移率确定为〜1.4 X 10〜(27)(〜1.9 X 10〜(27))m〜(- 3)和〜3.5 X 10〜(-3)(〜3.1 X 10〜(-3))m〜2 V〜(-1)s〜(-1),对于δ= 0.04(-0.03)电子和空穴。发现这些载体参数同时解决了观察到的反射光谱线形状。 YH_(2 +δ)中观察到的补偿与以前使用的简单标准[E. Fawcett和W.A. Reed,物理学。 Rev. 131,2463(1963)]。

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