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Superconductivity in MgB2 doped with Ti and C

机译：Ti和C掺杂的MgB2中的超导

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Measurements of the superconducting tipper critical field, H-c2, and critical current density, J(c) have been carried out for MgB2 doped with Ti and/or C in order to explore the problems encountered if these dopants are used to enhance the superconducting performance. Carbon replaces boron on the MgB2 lattice and apparently shortens the electronic mean free path of MgB2 and raising H-c2. Titanium forms precipitates of either TiB or TiB2 that enhance the flux pinning and raise J(c). Most of these precipitates are intra-granular in the MgB2 phase. For samples containing both C and Ti doping, the C appears to still replace B in the MgB2 lattice and the Ti precipitates out as a boride. If approximately 0.5%Ti and approximately 2%C are co-deposited with B to form doped boron fibers and these fibers are in turn reacted in Mg vapor to form doped MgB2, the resulting superconductor has H-mu0(c2)(T = 0) similar to 25 T and J(c) similar to 10,000 A/cm(2) at 5 K and 2.2 T. (C) 2004 Elsevier B.V. All rights reserved.
机译：已对掺有Ti和/或C的MgB2进行了超导tip尖临界场H-c2和临界电流密度J（c）的测量，以探讨如果使用这些掺杂剂来增强超导时所遇到的问题性能。碳取代了MgB2晶格上的硼，显然缩短了MgB2的电子平均自由程并提高了H-c2。钛会形成TiB或TiB2的沉淀物，从而增强磁通量固定并提高J（c）。这些沉淀物中的大多数在MgB2相中是颗粒内的。对于同时包含C和Ti掺杂的样品，C似乎仍取代MgB2晶格中的B，并且Ti以硼化物形式析出。如果将大约0.5％的Ti和大约2％的C与B共沉积以形成掺杂的硼纤维，然后这些纤维又在Mg蒸气中反应以形成掺杂的MgB2，则所得的超导体具有H-mu0（c2）（T = 0 ）类似于25 T和J（c）类似于在5 K和2.2 T下的10,000 A / cm（2）。（C）2004 Elsevier BV保留所有权利。

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