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arXiv 2602.10313cond-mat.supr-con
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V₂Ga₅超导体可能接近铁磁性

Possible Proximity to Ferromagnetism in the V$_2$Ga$_5$ Superconductor

Gdansk University of Technology(格但斯克理工大学);Clemson University(克莱姆森大学);Slovak Academy of Sciences(斯洛伐克科学院);P.J. Šafárik University(P.J.沙法里克大学)

Szymon Królak, Xudong Huai, Wiktoria Jarosz, Filip Košuth, Pavol Szabó, Michał J. Winiarski, Sudip Malick, Thao T. Tran, Tomasz Klimczuk

AI总结:

V₂Ga₅超导体在T≈10 K以下可能发展铁磁相关性,DFT计算显示费米能级处于态密度峰值,磁矩与实验值相符。

摘要:

超导性和铁磁性通常是d电子系统中的竞争基态,在基础研究中其相互作用具有重要意义。我们对高质量的单晶和多晶V₂Ga₅进行了全面研究,这是一种II型 bulk 超导体(Tc=3.54 K),具有准一维晶体结构,辅以密度泛函理论(DFT)计算,表明可能接近铁磁序。在T≈10 K以下,磁化率显示ZFC/FC分裂,同时M(H)中出现饱和和滞后现象。此外,电输运测量显示磁感应强度依赖的电阻率上升,而比热在磁场中增强。DFT计算显示V₂Ga₅的费米能级位于态密度峰值处,每个单位晶胞的磁矩较小,与实验值相仿。这些结果表明,铁磁相关性可能在T≈10 K以下发展,远高于Tc,但超导相变抑制了长程铁磁序。

英文摘要:

Superconductivity and ferromagnetism are generally competing ground states in $d$-electron systems, making their interplay of fundamental interest. We report a comprehensive study of high-quality single- and polycrystalline V$_2$Ga$_5$, a bulk type-II superconductor ($T_c = 3.54 \ K$) with a quasi-one-dimensional crystal structure, supplemented with density functional theory (DFT) calculations, suggesting possible proximity to ferromagnetic order. Below $T \approx 10 \ K$, magnetic susceptibility shows ZFC/FC splitting, along with saturation and hysteresis in $M(H)$. Moreover, electrical transport measurements reveal a magnetic-field-dependent resistivity upturn, while specific heat is enhanced in magnetic fields. DFT calculations show that the Fermi level in V$_2$Ga$_5$ is located at a peak in the density of states, with a small magnetic moment per unit cell comparable to the experimental value. Together, these results indicate the possibility that ferromagnetic correlations develop below $T \approx 10 \ K$, well above $T_c$, with long-range ferromagnetic order suppressed by the superconducting transition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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