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摘要
超导态是一个宏观量子相干态, 其载流子是库珀对. 在没有外加磁场和电流的时候, 这些库珀对的运动行为用统一的波函数$ \psi = {\psi _{\rm{0}}}{{\rm{e}}^{{\rm{i}}\varphi }}$ 进行描述, 其相位φ在宏观尺度上是相同的. 当磁场低于一定值的时候, 在超导体的边界处穿透深度内会出现一个屏蔽电流来对抗外磁场的侵入, 样品处于迈斯纳态. 然而, 当磁场超过一定值的时候, 磁场会进入到超导体中, 迈斯纳态被破坏掉, 在超导体内形成超导区和正常区及其相应的界面. 根据此时这个界面处能量的正负, 把超导体分成I类和II类超导体, 分别对应正和负界面能. 目前发现的绝大多数超导体都是II类超导体, 因为界面能为负值, 因此进入到超导体的磁场会分离成最细小的单元, 以保证最大的界面面积, 降低系统能量. 该最小的磁通束被称为磁通量子, 其磁通量是$ {\varPhi _0} = h/2e$ (h为普朗克常数, e为电子电量). 这些磁通线之间有一定的排斥力, 因此它们会形成点阵. 当外加输运电流的时候, 这些磁通线会受到一个洛伦兹力作用而运动, 但是运动就会造成能量的损耗, 超导体就会因此失去电阻为零的优良品质. 通过在超导体中引入一些缺陷、杂质或位错, 就可以把磁通钉扎住, 超导体仍然可以有零损耗特性, 而这个特性可以用于超导体的强电应用. 本文将对磁通钉扎和磁通动力学及其研究方法做一点简单介绍.-
关键词:
- 高温超导体 /
- 磁通动力学 /
- 铜氧化物超导体 /
- 铁基超导体
Abstract
Superconductivity is achieved through macroscopic phase coherence; the charge carriers are Cooper pairs. In absence of an external magnetic field and applied current, the behavior of these Cooper pairs can be described by a single wave function$ \psi = {\psi _{\rm{0}}}{e^{i\varphi }}$ , and the phase is uniform over the space. When applying an external field but still below a certain threshold, a screening current will be established at the surface, which prohibits the entering of magnetic field, that is so-called Meissner effect. When the external field is larger than this threshold, the magnetic flux will penetrate into the sample, forming the interface of superconducting and normal state regions. According to the sign of this interface energy, we can categorize superconductors into type-I (positive interface energy) and type-II (negative interface energy). Most superconductors found so far are type-II in nature. Due to the negative interface energy in type-II superconductors, the penetrated magnetic flux will separate into the smallest bundle, namely the quantum flux line, with a quantized flux${\varPhi _0} = h/2e$ (h is the Planck constant and e is the charge of an electron). There are weak repulsive interactions among these vortices, thus usually they will form a lattice, called mixed state. When applying a current, a Lorentz force will exert on the flux lines (vortices) and will make them to move, this will induce energy dissipation and the appreciable feature of zero resistance of a superconductor will be lost. By introducing some defects, impurities or dislocations into the system, it is possible to pin down these vortices and restore the state of zero resistance. The study concerning vortex pinning and dynamics is very important, which helps not only the understanding of fundamental physics, but also to the high power application of type-II superconductors. This paper gives a brief introduction to the vortex dynamics of type-II superconductors.-
Keywords:
- high temperature superconductors /
- flux dynamics /
- cuprate superconductors /
- iron based superconductors
作者及机构信息
Authors and contacts
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施引文献
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图 1 II类超导体的 (a)磁化强度曲线和(b)磁感应强度随外磁场的变化示意图. Hc1和Hc2分别是下和上临界磁场, Meissner和Mixed state分别表示迈斯纳态和混合态区域
Fig. 1. Schematic plot of (a) magnetization and (b) magnetic induction with the variation of external magnetic field H. Hc1 is lower critical magnetic field and Hc2 is upper critical magnetic field. Meissner state and Mixed state are labelled as “Meissner” and “Mixed state” respectively.
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图 2 II类超导体NbTi的磁滞回线. 在冷加工的样品中, 由于存在很多缺陷和位错, 会有磁通钉扎中心的存在, 因此磁滞回线就变成不可逆的
Fig. 2. Magnetic hysteresis loops (MHLs) of type II superconductor NbTi. In the cold-annealed samples, MHLs are irreversible in a large field region due to the existence of defects and dislocations which form the flux pinning centers.
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图 3 (a), (b)铜氧化物超导体YBa2Cu3O7–δ在40和78 K的磁滞回线, 实心点和空心点分别对应的是氧缺位较多和在氧气中后处理的样品; (c), (d)铁基超导体Ba0.6K0.4Fe2A2在不同温区的磁滞回线[ 2]
Fig. 3. (a), (b) MHLs of cuprate superconductor YBa2Cu3O7–δ with oxygen-deficient (solid point) and oxygen-rich states (hollow point) at 40 and 78 K; (c), (d) MHLs of iron-based superconductor Ba0.6K0.4Fe2A2 at different temperatures[ 2].
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图 4 Bi-2212超导体的磁化强度随温度的变化. 图中实心点是在ZFC过程中测量的数据, 空心点是FC过程测量的数据 (磁场平行于c-轴)
Fig. 4. Temperature dependence of magnetization for Bi-2212 with zero-field-cooled (ZFC) measurement (solid point) and field-cooled (FC) measurement (hollow point) when magnetic field is parallel to c-axis.
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图 5 磁通钉扎示意图. 竖直方向的弯曲的管状表示的是磁通, 实心点表示的是缺陷
Fig. 5. Schematic show of flux pinning. The vertical curved tube represents the magnetic flux, and the solid spots represent defects.
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图 6 高温超导体YBa2Cu3O7–δ的(a)磁化曲线宽度(正比于临界电流)和(b)磁通钉扎力随外磁场的变化[ 2]
Fig. 6. Field dependence of (a) width of magnetization husteresis loop (proportional to critical current) and (b) flux pinning force for high temperature superconductor YBa2Cu3O7–δ[ 2]
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图 7 在磁通开始穿透过程中, 依据Bean临界态模型画出的磁感应强度在空间的分布情况
Fig. 7. Distribution of magnetic induction (proportional to the local flux density) in the initial process of flux penetration according to Bean critical state model.
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图 8 Bean临界态模型下的磁化强度曲线(红色实线)和磁感应强度在空间分布的示意图(小矩形框图, 深颜色地方的高度显示的是磁感应强度的大小)
Fig. 8. Distribution of magnetization (red solid line) and magnetic flux density (dark areas represent the height of magnetic flux density in small rectangular diagrams) according to Bean critical state model.
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图 9 Tl2Ba2CaCu2O8超导薄膜在外磁场平行于c-轴（膜厚度方向）时的磁滞回线[ 12]. 这里大部分的磁滞回线显示的是正磁场的部分, 只有40 K的数据显示了一个完整的正负磁场的磁滞回线
Fig. 9. MHLs of Tl2Ba2CaCu2O8 superconducting thin films with external magnetic field parallel to c-axis[ 12]. Most of the MHLs are only shown for the part of positive magnetic field; except for that at 40 K it shows a complete MHL which includes both positive and negative field parts.
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图 10 磁通的热激活运动模型, 蓝色的波浪线示意磁通钉扎的势垒在空间变化情况. 红色圆点显示的是一根磁通
Fig. 10. Schematic of thermally activated flux motion model. Blue wavy lines represent the spatial distribution of flux pinning barrier. The red spot represents a single flux line.
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图 11 磁通蠕动示意图. 红色圆点是磁通钉扎中心, 黑色粗线是磁通的初始状态, 在洛伦兹力作用下, 磁通向右边运动, 其中用蓝色虚线标识的一段磁通运动到下个钉扎点, 然后其他段再逐次蠕动
Fig. 11. Schematic of flux creep. Red points represent flux pinning centers and black thick line is the initial flux state. Under the action of Lorentz force, the flux starts to move toward right direction. During the process, the blue dashed part firstly moves to next pinning center and then other parts creep gradually.
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图 12 Tl2Ba2CaCu2O8超导薄膜中测量到的超导体磁化强度(大约正比于超导体瞬态临界电流) 随时间的变化[ 12]. 测量磁场是0.4T, 测量温度是4.5, 10, 15, 20, 25, 30, 35, 40K (从上往下)
Fig. 12. Magnetization of Tl2Ba2CaCu2O8 superconducting thin films (approximately proportional to time-variation of the transient critical current in superconductor)[ 12]. The measurement was taken under a magnetic field of 0.4 T, and at 4.5, 10, 15, 20, 25, 30, 35, 40 K (from top to bottom)
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图 13 集体钉扎情况下, 非线性U(j) 关系来源示意图. 当外电流j与临界电流jc接近时, 最可能跳跃的长度是一个较短的集体钉扎长度Lc，此时的热激活能比较小. 当外电流远远小于临界电流时, 最佳的跳跃方式是一段较长 (长度为L) 的磁通束从外电流中获取更大的能量, 然后跳跃一个相对较高的势垒U, 而
$L/{L_{\rm{c}}} > {j_{\rm{c}}}/j$ . 因此热激活跳跃的最可能的长度或体积将会随着洛伦兹力(或电流)的变化而非线性变化. 该图取自文献[21]Fig. 13. Schematic of the origin of nonlinear U(j) relation in collective pinning model. When external current j is close to critical current jc, the optimized jump length is a short collective pinning length Lc. If j is far less than jc, the best way to jump is a long (L-length) flux line or bundle to obtain sufficient energy from external current j and then jump a relatively high barrier, and
$L/{L_{\rm{c}}} > {j_{\rm{c}}}/j$ . Therefore, the optimized hopping length or volume of thermally activated flux motion will change along with the Lorenz force (current). The figure is adopted from the literature[21].下载:
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图 14 涡旋玻璃图象下的耗散行为. 在T = Tg, 发生了磁通固态的二级融化相变. 在融化温度以上, 有一个线性电阻存在, 其耗散可以用热激活磁通流动模型描述. 融化温度以下对应着涡旋固态, 尽管磁通位置的空间有序不再存在, 但是超导的长程位相关联仍然存在, 因此系统线性电阻为零. 类比于自旋玻璃态, Fisher把它定义为涡旋玻璃态[ 14]
Fig. 14. Schematic of dissipation in vortex glass picture. A second-order melting phase transition occurs at T = Tg. A linear resistance exists above the melting temperature, and its dissipation can be described by thermally activated flux flow model. There is vortex solid state below the melting temperature. Even though the order of flux lattices no longer exists, the long-range superconducting phase correlation still exists, so the linear resistance of the system is zero. As an analogous to spin glass, Fisher defined it as vortex glass[ 14]
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图 15 验证涡旋玻璃最早的数据之一. 磁场为0.5 T (a) 和4 T (b) 时在YBCO薄膜制备的微桥上测量到的E-j耗散关系. Koch等[ 22]将不同磁场下测量到的数据利用二级相变的标度率进行标度发现其临界指数均接近z ≈ 5, ν ≈ 1.7
Fig. 15. One set of the earliest data to verify vortex glass. E-j dissipation relation measured on YBCO thin film micro-bridge at 0.5 T (a) and 4 T (b). Koch et al.[ 22] scaled the data measured under different magnetic fields by using the scaling of second-order phase transition, and found that the critical exponents are close to z ≈ 5, ν ≈ 1.7.
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图 16 YBa2Cu3O–δ薄膜在宽电场范围内的耗散关系. 上部分为电输运测量结果, 下半部分为磁感应测量到的磁化强度弛豫结果. 经过分析, 即便在非常低的电场下(10–9 V/m), 其耗散也非常低, 而没有出现一个恒定大小的电阻, 磁通运动耗散仍然可以用涡旋玻璃模型来描述, 因此进一步证明了涡旋玻璃的存在
Fig. 16. Dissipation relation in a wide range of electric field of a YBa2Cu3O7–δ thin film. The upper part is the result of electric transport measurement, and the lower part is the result of magnetization relaxation measured by magnetic induction. After analysis, even in very low electric field (10–9 V/m), the dissipation is very low, and there is no constant resistance. The magnetic flux dissipation can still be described by the vortex glass model, and therefore, the existence of vortex glass is further proved.
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图 17 铁基超导体Ba0.6K0.4Fe2As2在不同温度的磁滞回线. 在2和5 K的磁滞回线上面, 出现了一些不连续的跳变, 这是磁通跳跃所造成的雪崩效应的结果. 磁通跳跃过程可以用磁光实验直接看见[ 3]
Fig. 17. MHLs of Ba0.6K0.4Fe2As2 at different temperatures. There are discontinuous jumps on the MHLs of 2 and 5 K, which is the result of avalanche effect caused by flux jump. The process of flux jump can be seen directly by magneto-optical experiment[ 3].
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图 18 (a) 常规超导体或三维性较强超导体的磁场-温度相图. 磁通运动的不可逆线与上临界磁场很接近; (b) 二维性较强的磁场-温度相图, 在上临界磁场以下的一个很大区域内出现磁通液态, 没有临界电流. 在更低的温度，会出现一个涡旋玻璃态, 其磁场和温度的上边界线对于不可逆线. 有理论预言在Hc1附近, 由于磁通密度很低, 磁通线间的相互作用很弱, 因此也可能出现一个磁通液态. 但是实验上对于这个钉扎液态不好界定, 因为没有线性耗散的出现
Fig. 18. (a) H-T phase diagram of conventional superconductors or superconductors with stronger three-dimensional properties. The irreversible line of flux motion is close to upper critical magnetic field; (b) H-T phase diagram of superconductors with stronger two-dimensional properties. There is flux liquid and no critical current in a large region below upper critical magnetic field. In the region at lower temperatures, there is a vortex glass state with zero linear resistance. The upper boundary of this vortex glass state is the irreversibility line Hirr(T). It is predicted that there may be a vortex liquid state near Hc1 as the flux density is very diluted and the interaction between flux lines is very weak. However, it is difficult to prove the existence of this pinned liquid state near Hc1 experimentally as there is no linear dissipation.
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图 19 三种不同类型II类超导体磁滞回线的第二峰效应(a) 2H-NbSe2超导体中的磁滞回线, 在上临界磁场附近发现一个尖峰; (b) 高温超导体Bi-2212中的磁滞回线, 在较低磁场的时候(200−500 Oe), 发现一个较陡的磁化强度第二峰; (c) 高温超导体YBCO中出现的第二峰, 其可以出现在很高的磁场值, 但是仍然远低于上临界磁场
Fig. 19. Second peak (SP) effect of three different types of MHLs in three kinds of type-II superconductors: (a) MHL of 2H-NbSe2 shows a sharp SP near upper critical field; (b) MHL of high temperature superconductor Bi-2212 shows a steeper SP at a lower magnetic field (200−500 Oe); (c) SP effect occurs in high temperature superconductor YBCO. The SP effect can appear at high magnetic fields, but the fields are still far below the upper critical field
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图 20 Bi-2212系统的磁场-温度相图. 在20−40 K温度内, 如方块符号所示的是第二峰出现的位置, 一般认为是在该磁场之下, 磁通系统处于布拉格玻璃态(Bragg glass), 然而超过这个磁场, 磁通系统处于正常的磁通玻璃态 分为耗散低的I区和耗散高的II区. 在40 K以上温区的相变线是磁通一级融化线(FOT, first order transition). 在20 K以下, 通过长时间的弛豫测量, 实际上磁通的布拉格相变仍然能够被观测到
Fig. 20. H-T phase diagram of Bi-2212 system. The positions of SP are shown by square symbols, in the temperature range of 20−40 K. It is generally believed that below the magnetic fields marked by the squre symbols, the flux system is in Bragg glass state, beyond that the flux system is in normal vortex glass state. The phase transition line above 40 K is FOT (first order transition) line of magnetic flux. Below 20 K, the Bragg phase transition of magnetic flux can still be observed by long-time relaxation measurement.
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图 21 Bi-2212单晶在T = 5 K温度, 在不同的时间窗口测量到的磁滞回线在降磁场部分随外磁场的变化. 在长时间弛豫以后, 第二峰效应仍然能够呈现出来, 表明布拉格玻璃相变在低于20 K的温区仍然能够发生
Fig. 21. MHLs of Bi-2212 single crystal at T = 5 K, measured at different time windows varying with external magnetic field. After a long time of relaxation, the SP effect can still appear, which indicates that the Bragg vortex phase transition can still occur in the temperature range below 20 K.
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- 第70卷，第1期 - 2021年01月05日
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