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首页> 外文期刊>Journal of Physics. Condensed Matter >Crystal growth and ambient and high pressure study of the re-entrant superconductor Tm2Fe3Si5
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Crystal growth and ambient and high pressure study of the re-entrant superconductor Tm2Fe3Si5

机译：重入超导体Tm2Fe3Si5的晶体生长及常压和高压研究

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Tm2Fe3Si5 is known to undergo a transition to the superconducting state (at ambient or applied pressure depending on the sample) at a temperature T-c1 (similar to 1.8 K), and at a lower temperature T-N (approximate to 1 K) it undergoes a transition into a long range antiferromagnetically ordered state. Superconductivity is simultaneously destroyed and the sample re-enters the normal state at T-c2 = T-N. The conditions reported in the literature for the observation of superconductivity in Tm2Fe3Si5 are sample dependent, but it is now accepted that stoichiometric Tm2Fe3Si5 superconducts only under pressure. Here we report single-crystal growth of stoichiometric Tm2Fe3Si5 which does not superconduct at ambient pressure down to 100 mK. Measurements of the anisotropic static magnetic susceptibility chi(T) and isothermal magnetization M(H), ac susceptibility chi(ac)(T), electrical resistivity rho(T) and heat capacity C(T) at ambient pressure and chi(ac)(T) at high pressure are reported. The magnetic susceptibility along the c axis, chi(c)(T), shows a curvature over the whole temperature range and does not follow the Curie-Weiss behavior, while the magnetic susceptibility along the a axis, chi(a)(T), follows a Curie-Weiss behavior between 130 and 300 K with a Weiss temperature theta and an effective magnetic moment mu(eff) which depend on the temperature range of the fit. The easy axis of magnetization is perpendicular to the c axis and chi(a)/chi(c) = 3.2 at 1.8 K. The ambient pressure chi(ac)(T) and C(T) measurements confirm bulk antiferromagnetic ordering at T-N = 1.1 K. The sharp drop in chi(ac)(T) below the antiferromagnetic transition is suggestive of the existence of a spin gap. We observe superconductivity only under applied pressures P >= 2 kbar. The temperature-pressure phase diagram showing the non-monotonic dependence of the superconducting transition temperature T-c on pressure P is presented.
机译：已知Tm2Fe3Si5在温度T-c1（类似于1.8 K）下会转变为超导状态（在环境压力或施加压力取决于样品的情况下），而在较低温度TN（大约1 K）下会经历超导状态的转变。过渡到长距离反铁磁有序状态。超导性同时被破坏，样品在T-c2 = T-N时重新进入正常状态。文献中报道的观察Tm2Fe3Si5中超导性的条件取决于样品，但是现在已经接受化学计量的Tm2Fe3Si5超导仅在压力下发生。在这里，我们报告了化学计量的Tm2Fe3Si5的单晶生长，它在低至100 mK的环境压力下不会超导。在环境压力和chi（ac）下测量各向异性静磁化率chi（T）和等温磁化强度M（H），交流磁化率chi（ac）（T），电阻率rh（T）和热容C（T） （T）在高压下有报道。沿c轴chi（c）（T）的磁化率在整个温度范围内显示曲率，并且不遵循居里-魏斯行为，而沿a轴chi（a）（T）的磁化率遵循130到300 K之间的居里-魏斯行为，具有魏斯温度θ和有效磁矩mu（eff），这取决于拟合的温度范围。易磁化轴垂直于c轴，并且在1.8 K时chi（a）/ chi（c）= 3.2。环境压力chi（ac）（T）和C（T）测量确认TN =时的大反铁磁有序1.1 K. chi（ac）（T）在反铁磁跃迁以下的急剧下降表明自旋间隙的存在。我们仅在施加压力P> = 2 kbar的情况下观察到超导性。给出了显示超导转变温度T-c与压力P的非单调依赖关系的温度-压力相位图。

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