Ryosuke Oka, Minu Kim, Peter Wochner, Sonia Francoual, Thomas T. M. Palstra, Hidenori Takagi and Dennis Huang
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引用次数: 0
摘要
在共振弹性 X 射线散射(REXS)中,晶体中的低位点对称性可以通过共振布拉格反射来揭示,由于螺旋轴和/或滑行面的原因,这些反射在传统 X 射线衍射中通常是被禁止的。在尖晶石化合物中已经观察到了这些共振禁止反射,但为了更好地理解和利用它们与微观材料参数以及可能的电荷和/或轨道有序性之间的联系,需要对它们与生长条件和应用应变之间的关系进行系统研究。我们在 V K 边缘进行了 REXS,并研究了在三种基底上生长的尖晶石 LiV2O4 薄膜中的共振禁止 (002) 反射:MgAl2O4、SrTiO3 和 MgO。随着外延应变对 V 位点局部各向异性的改变,(002) 反射的能量依赖性显示出系统性的演变。更引人注目的是,在不同基底上的薄膜中,(002) 反射的综合强度相差一个数量级以上。我们推测,综合强度的巨大差异反映了外延过程中出现的不同程度的反相畴。
Heteroepitaxial tuning of resonant forbidden reflections in a spinel†
In resonant elastic X-ray scattering (REXS), low site symmetries in a crystal may be revealed through resonant Bragg reflections that are normally forbidden in conventional X-ray diffraction due to screw axes and/or glide planes. These resonant forbidden reflections have been observed in spinel compounds, but to better understand and utilize their connection to microscopic material parameters and possible charge and/or orbital ordering, a systematic study of their dependence on growth conditions and applied strain is desired. We performed REXS at the V K edge and examined the resonant forbidden (002) reflection in thin films of the spinel LiV2O4 grown on three substrates: MgAl2O4, SrTiO3, and MgO. The energy dependence of the (002) reflection shows a systematic evolution as epitaxial strain modifies the local anisotropy of the V site. More strikingly, the integrated intensity of the (002) reflection varies by more than an order of magnitude in films on different substrates. We speculate that the large variation in integrated intensity reflects the varying degree of antiphase domains that arise during the epitaxy.
期刊介绍:
The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study:
Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability.
Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine.
Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices.
Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive.
Bioelectronics
Conductors
Detectors
Dielectrics
Displays
Ferroelectrics
Lasers
LEDs
Lighting
Liquid crystals
Memory
Metamaterials
Multiferroics
Photonics
Photovoltaics
Semiconductors
Sensors
Single molecule conductors
Spintronics
Superconductors
Thermoelectrics
Topological insulators
Transistors