Calorimetric evidence for enhancement of homogeneity in high performance Sr1-xKxFe2As2 superconductors
Calorimetric evidence for enhancement of homogeneity in high performance Sr1-xKxFe2As2 superconductors
复制标题
高性能 Sr1-xKxFe2As2 超导体均匀性增强的量热证据
DOI：
10.1016/j.scriptamat.2017.05.047
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发表时间：
2017-09-01
影响因子：
6
通讯作者：
Ma, Yanwei
中科院分区：
文献类型：
--
作者：
Dong, Chiheng;Yao, Chao;Ma, Yanwei
我们对比研究了轧制和热压SR1-xKxFe2As2带材的临界电流密度、磁化强度和比热。在热压带材中，卷带比热明显的肖特基反常现象消失。此外，热压带材具有更高的超导电性分数和更窄的超导转变温度分布。结合磁化强度数据，我们得出结论：高压烧结为完全化学反应提供了更好的环境和更均匀的掺杂分布，这有利于超导体的整体电流。(C)2017 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
We comparatively studied the critical current density, magnetization and specific heat of the rolled and the hot pressed Sr1-xKxFe2As2 tapes. The Schottky anomaly that is obvious in the specific heat of the rolled tape disappears in the hot-pressed tape. Moreover, the hot-pressed tape has a higher fraction of superconductivity and a narrower distribution of superconducting transition temperature than the rolled tape. Combined with the magnetization data, we conclude that sintering under high pressure provides a better environment for complete chemical reaction and more homogenous dopant distribution, which is beneficial to the global current of a superconductor. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.