It is well-known that magnetic moments are very harmful to superconductivity. A typical example is the element Mn, whose compounds usually exhibit strong magnetism. Thus, it is very difficult to achieve superconductivity in materials containing Mn. Here, we report enhanced superconductivity with a superconducting transition temperature (T_c) up to a record-high value of about 26 K in a beta-phase Ti_1–xMn_x alloy containing the rich magnetic element Mn under high pressures. This is contrary to the intuition that magnetic moments always suppress superconductivity. Under high pressures, we also found that in the middle-pressure regime, the Pauli limit of the upper critical field is surpassed. The synchrotron X-ray diffraction data show an unchanged beta-phase with a continuous contraction of the cell volume, which is well-supported by the first-principles calculations. Although the theoretical results based on electron–phonon coupling can interpret the T_c value in a certain pressure region, the monotonic enhancement of superconductivity by pressure cannot seek support from the theory. Our results show a surprising enhancement of superconductivity in the Ti_1–xMn_x alloy with a considerable Mn content.

中文翻译：

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富含磁性元素 Mn 的 Ti1-xMnx 合金创纪录高超导转变温度


众所周知，磁矩对超导性非常有害。一个典型的例子是元素Mn，其化合物通常表现出强磁性。因此，在含Mn材料中实现超导性是非常困难的。在这里，我们报告了β相 Ti _1–x Mn _x ) 达到约 26 K 的创纪录高值的增强超导性。 /b2>高压下含有富磁性元素Mn的合金。这与磁矩总是抑制超导性的直觉相反。在高压下，我们还发现在中压状态下，超过了上临界场的泡利极限。同步加速器X射线衍射数据显示β相不变，细胞体积持续收缩，这得到了第一性原理计算的充分支持。虽然基于电子声子耦合的理论结果可以解释一定压力区域内的T _c 值，但压力对超导性的单调增强无法寻求理论的支持。我们的结果表明，具有相当大锰含量的 Ti _1–x Mn _x 合金的超导性令人惊讶地增强。