Upper Critical Field of Solid Solution Alloys of the Transition Elements
Upper Critical Field of Solid Solution Alloys of the Transition Elements
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DOI：
10.1103/revmodphys.36.74
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发表时间：
1964
影响因子：
44.1
通讯作者：
C. K. Jones;J. Hulm;B. Chandrasekhar
中科院分区：
文献类型：
--
作者：
C. K. Jones;J. Hulm;B. Chandrasekhar
根据穿透深度X大于或小于相干长度$，超导体可分为两类。那些有……的人。P被称为伦敦超导体，而那些有P和g的超导体。从Abrikosov对Ginzburg-Landau理论的现象学发展和Gor'kov4基于微观BCS理论的工作中可以明显看出，绝大多数超导合金和化合物都属于伦敦型。这与大多数元素超导体相反，除了在非常狭窄的温度范围内接近T时，它们是皮帕德型的，在那里它们表现出伦敦型的行为。也许伦敦超导体最著名的性质是混合态，它发生在低场H和高场H之间，s。在这种状态下（不要与几何中间状态混淆），有部分通量渗透到样品中，并且在H处完成向正常状态的过渡，s大于热力学临界场H。abrikosov表明，当G-L阶参量s大于1/v 2时，出现混合态，上临界场H， Q为
Superconductors may be divided into two classes, according to whether the penetration depth X is greater or less than the coherence length $. Those with) I.) P have been called London superconductors, and those with) & g Pippard superconductors.'It has be-come evident, both from the phenomenological de-velopment by Abrikosov'of the Ginzburg—Landau'theory, and from the work of Gor'kov4 based on the microscopic BCS theory, that the great majority of superconducting alloys and compounds are of the London type. This is in contrast to most elemental superconductors, which are of the Pippard type except in a very narrow temperature range close to T, where they show the Londontype of behavior. Per-haps the best-known property of the London super-conductor is the mixed state,'which occurs between a lower field H. and an upper field H, s. In this state (not to be confused with the geometrical intermediate state), there is partial flux penetration into the sample, and the transition to the normal state is com-pleted at H, s which is greaterthan the thermody-namic critical field H,. Abrikosovshowed that if the G—L order parameter s is greater than 1/v 2, the mixed state appears, and the upper critical field H, Q is given by