Record high superconducting transition temperature in Ti_1-xMn_x alloy with rich magnetic element Mn
arxiv(2024)
摘要
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 hard to achieve superconductivity in materials
containing Mn. Here, we report enhanced superconductivity with the
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 rich magnetic
element Mn under high pressures. This is contrary to the intuition that the
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 shows 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 (EPC) 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 Ti_1-xMn_x alloy
with a considerable Mn content.
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