高温超导双晶结导向磁通运动以及太赫兹混频检测器研究
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摘要
在高温超导YBa_2Cu_3O_(7-δ)单晶中有许多的孪晶,对于研究磁通精确运动来说体系比较复杂。我们利用双晶结中人工制造的,单个的双晶晶界,通过控制晶界的位置和取向,研究了晶界对磁通的诱导作用,进一步揭示晶界钉扎诱导下的磁通霍尔流动(霍尔电阻反常)。为我们深入研究太赫兹与高温超导约瑟夫森结的相互作用机理,分析双晶结的电磁噪声性能等提供重要的理论实验依据。本论文的主要研究工作与创新成果：
利用人工双晶晶界研究纵向磁致电阻和霍尔磁致电阻对温度、电流、磁场的依赖关系。晶界的存在将影响YBa_2Cu_3O_(7-δ)薄膜的磁通输运特性,由于晶界对磁通的诱导作用,倾斜的晶界将增加体系中磁通的横向运动分量,从而大大增加体系的霍尔电阻。
得到了双晶晶界存在时高温超导薄膜的H-T相图。相图分为四个区域：完全超导态、晶界流动态、磁通流动态以及正常态,而晶界流动态在超导薄膜中是没有被看到的。驱动电流与磁场越大,磁通晶界流动态的范围越大。
低磁场情况下,晶界的Ⅰ-Ⅴ特性曲线出现磁通晶格运动模式转变引起的电压台阶型跳跃;在场冷剩场情况下,Ⅰ-Ⅴ特性曲线特殊的回滞现象,说明双晶晶界内部点钉扎力的不均匀性。
运用电子束曝光(EB)技术成功制备了800nm结宽的带有天线的YBa_2Cu_3O_(7-δ)双晶结太赫兹超导混频器,由于超流减小,提高了对太赫兹波灵敏度；运用新的工艺方法--两次减薄,酸刻和干刻结合的方法成功制备了T1_2Ba_2Ca_3Cu4O_(12-δ)双晶结,结的稳定性大幅提高。研究高温超导双晶结太赫兹的谐波混频器,测量了基本特性,表明其具有灵敏度和谐波次数高等独特的优点。
Artificial pinning defects, which is usually used to control vortex motion, has been a topic of great interest in the field of vortex dynamics in recent years. Vortex is a macroscopic quantum phenomenon wherein an individual vortex is quantized. Precise control of an individual quantized vortex plays an important role in growing number of flux devices. YBa2Cu3O7-σ (YBCO) single crystals normally have a large quantity of twin bound-aries (TBs), which have been studied through numerous experimental techniques and theoretical calculations. A large amount of TBs introduce complexity to research on the precise motion of vortices. In this study, we use an individual artificial YBCO bicrystal grain boundary (GB). The principle of the bicrystal technology consists of growing a film epitaxially on a bicrystalline substrate. Owing to epitaxial growth, the substrate grain boundary is replicated in the film. This technique enables one to fabricate well-defined grain boundaries of many misorientations.
GBs can locally reduce superconduction, depair current density, suppress the onset of vortex penetration, and increase power dissipation. GBs can act as easy-flow channels for vortex motion. We study guiding of vortices in a YBCO film with an individual inclined GB. Dissipative resistance in high-Tc superconductor (HTS) YBCO films caused by guiding of vortices with the GB is highly dependent on the location of the GB. We investigate the dependence of both longitudinal (Rxx) and transversal (Rxy) magnetoresistances on the orientation of the GB, temperature, current density, and magnetic field intensity. The inclined GB has a significant influence on transport properties of YBCO film.
We have determined that the preferential vortices flow along the GB, which can be described as a channel flow state. An increase in temperature or magnetic field intensity leads to the destruction of the guided motion of vortices, and both longitudinal and transversal magnetoresistances are close to the properties of normal HTS films without GB. We present experimental measurements of the guiding effect in YBCO film with an individual GB oriented at the angle a=30°with respect to the direction of the applied current. We can also develop a significant magnetic-field temperature phase diagram in the presence of the GB, which reflects the important role of the GB in vortex transport properties of HTS.
We used EB to fabricate800nm wide YBCO bicrystal junctions, and we used double reduction methord to fabricate TIBaCaCuO bicrystal junctions. Due to high temperature superconducting (HTS) Josephson junction has excellent high frequency and nonlinear properties, it can be used in HTS frequency mixer. HTS Josephson junction mixer has much excellence, including its high sensitivity and harmonic, low local oscillator frequency and microwave power, low noise and wide frequency band.
利用人工双晶晶界研究纵向磁致电阻和霍尔磁致电阻对温度、电流、磁场的依赖关系。晶界的存在将影响YBa_2Cu_3O_(7-δ)薄膜的磁通输运特性,由于晶界对磁通的诱导作用,倾斜的晶界将增加体系中磁通的横向运动分量,从而大大增加体系的霍尔电阻。
得到了双晶晶界存在时高温超导薄膜的H-T相图。相图分为四个区域：完全超导态、晶界流动态、磁通流动态以及正常态,而晶界流动态在超导薄膜中是没有被看到的。驱动电流与磁场越大,磁通晶界流动态的范围越大。
低磁场情况下,晶界的Ⅰ-Ⅴ特性曲线出现磁通晶格运动模式转变引起的电压台阶型跳跃;在场冷剩场情况下,Ⅰ-Ⅴ特性曲线特殊的回滞现象,说明双晶晶界内部点钉扎力的不均匀性。
运用电子束曝光(EB)技术成功制备了800nm结宽的带有天线的YBa_2Cu_3O_(7-δ)双晶结太赫兹超导混频器,由于超流减小,提高了对太赫兹波灵敏度；运用新的工艺方法--两次减薄,酸刻和干刻结合的方法成功制备了T1_2Ba_2Ca_3Cu4O_(12-δ)双晶结,结的稳定性大幅提高。研究高温超导双晶结太赫兹的谐波混频器,测量了基本特性,表明其具有灵敏度和谐波次数高等独特的优点。
Artificial pinning defects, which is usually used to control vortex motion, has been a topic of great interest in the field of vortex dynamics in recent years. Vortex is a macroscopic quantum phenomenon wherein an individual vortex is quantized. Precise control of an individual quantized vortex plays an important role in growing number of flux devices. YBa2Cu3O7-σ (YBCO) single crystals normally have a large quantity of twin bound-aries (TBs), which have been studied through numerous experimental techniques and theoretical calculations. A large amount of TBs introduce complexity to research on the precise motion of vortices. In this study, we use an individual artificial YBCO bicrystal grain boundary (GB). The principle of the bicrystal technology consists of growing a film epitaxially on a bicrystalline substrate. Owing to epitaxial growth, the substrate grain boundary is replicated in the film. This technique enables one to fabricate well-defined grain boundaries of many misorientations.
GBs can locally reduce superconduction, depair current density, suppress the onset of vortex penetration, and increase power dissipation. GBs can act as easy-flow channels for vortex motion. We study guiding of vortices in a YBCO film with an individual inclined GB. Dissipative resistance in high-Tc superconductor (HTS) YBCO films caused by guiding of vortices with the GB is highly dependent on the location of the GB. We investigate the dependence of both longitudinal (Rxx) and transversal (Rxy) magnetoresistances on the orientation of the GB, temperature, current density, and magnetic field intensity. The inclined GB has a significant influence on transport properties of YBCO film.
We have determined that the preferential vortices flow along the GB, which can be described as a channel flow state. An increase in temperature or magnetic field intensity leads to the destruction of the guided motion of vortices, and both longitudinal and transversal magnetoresistances are close to the properties of normal HTS films without GB. We present experimental measurements of the guiding effect in YBCO film with an individual GB oriented at the angle a=30°with respect to the direction of the applied current. We can also develop a significant magnetic-field temperature phase diagram in the presence of the GB, which reflects the important role of the GB in vortex transport properties of HTS.
We used EB to fabricate800nm wide YBCO bicrystal junctions, and we used double reduction methord to fabricate TIBaCaCuO bicrystal junctions. Due to high temperature superconducting (HTS) Josephson junction has excellent high frequency and nonlinear properties, it can be used in HTS frequency mixer. HTS Josephson junction mixer has much excellence, including its high sensitivity and harmonic, low local oscillator frequency and microwave power, low noise and wide frequency band.
引文
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