Superconductivity in rubidium-substituted Ba1-xRbxTi2Sb2O
Superconductivity in rubidium-substituted Ba1-xRbxTi2Sb2O
复制标题
铷取代的 Ba1-xRbxTi2Sb2O 的超导性
DOI：
10.1103/physrevb.89.094505
复制
发表时间：
2014
影响因子：
3.7
通讯作者：
Hans-Henning Klauss
中科院分区：
文献类型：
--
作者：
S. Kamusela;P. Materne;H. Maeter;R. Sarkar;T. Goltz;L. Harnagea;S. Wurmehl;B. Büchner;H. Luetkens;Hans-Henning Klauss
我们报告的合成和物理性质的BaRbTiSbO（）的X射线衍射，超导量子干涉装置的磁强计，电阻率，比热测量。当用Rb取代Ba进行空穴掺杂时，我们发现超导电性具有最大值K。同时，电荷密度波转变温度从母体化合物中的K强烈降低，并且似乎被抑制。最佳掺杂样品（）的超导态的体特征通过比热在，mJ/mol K处的良好发展的不连续性以及40%的大迈斯纳屏蔽分数的出现而得到证实。最佳掺杂样品的各向同性平均下临界场和上临界场分别估计为T和T，表明这些化合物是强II型超导体。
We report on the synthesis and the physical properties of BaRbTiSbO () by x-ray diffraction, superconducting quantum interference device magnetometry, resistivity, and specific-heat measurements. Upon hole doping by substituting Ba with Rb, we find superconductivity with a maximumK. Simultaneously, the charge-density-wave transition temperature is strongly reduced fromK in the parent compoundand seems to be suppressed for. The bulk character of the superconducting state for the optimally doped sample () is confirmed by the occurrence of a well developed discontinuity in the specific heat at, withmJ/mol K, as well as a large Meissner-shielding fraction of40%. The isotropically averaged lower and upper critical fields of the optimally doped sample () are estimated tomT andT, respectively, indicating that these compounds are strongly type-II superconductors.