Spin-density wave in polycrystalline Cr films from infrared reflectivity
Spin-density wave in polycrystalline Cr films from infrared reflectivity
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多晶铬薄膜中红外反射率的自旋密度波
DOI：
10.1103/physrevb.76.224429
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发表时间：
2007
影响因子：
3.7
通讯作者：
F. Hellman
中科院分区：
文献类型：
--
作者：
Z. Boekelheide;E. Helgren;F. Hellman
作者：博克尔海德，Z；赫尔格伦，E；赫尔曼，F
摘要：通过红外反射率确定能隙能量，测定了多晶铬薄膜的自旋密度波特性。块状铬的非公度自旋密度波对应力、无序和有限尺寸效应（如在多晶薄膜中发现的那些效应）的扰动高度敏感。在不同条件下制备的薄膜显示出三种不同类型的自旋密度波行为：非公度、公度和混合。出乎意料的是，混合相包括非公度自旋密度波和两种不同形式的公度自旋密度波。创建了一个由现象学确定的低温相图，以描述应力 - 无序平面中铬的自旋密度波。应力和无序对铬薄膜自旋密度波的影响类似于块状铬中稀合金化的影响。在这种情况下，张应力与锰杂质有相似的作用，而无序与铝有相似的作用。© 2007美国物理学会
Author(s): Boekelheide, Z; Helgren, E; Hellman, F | Abstract: The spin-density wave properties of polycrystalline chromium thin films were determined by using infrared reflectivity to determine the gap energies. The incommensurate spin-density wave of bulk chromium is highly sensitive to perturbations from stress, disorder, and finite size effects, such as those found in polycrystalline films. Films prepared under various conditions display three different types of spin-density wave behavior: incommensurate, commensurate, and mixed. Unexpectedly, the mixed phase includes the incommensurate spin-density wave and two different forms of commensurate spin-density wave. A phenomenologically determined low-temperature phase diagram is created to describe the spin-density wave in chromium in the stress-disorder plane. The effects of stress and disorder on the spin-density wave of chromium films are analogous to the effects of dilute alloying in bulk chromium. In this case, tensile stress has a similar effect to Mn impurities, while disorder has a similar effect to Al. © 2007 The American Physical Society.