TmCo2B2C的合成及磁性表征
Synthesis and magnetic characterization of TmCo2B2C
摘要：
采用快速淬火法合成了新型四元金属间化合物TmCo_2B_2C。元素和粉末衍射分析建立了正确的化学计量和单相特性。晶体结构与TmNi_2B_2C（I_4/mmm）的晶体结构是同晶的，并且在所研究的温度范围内是稳定的。在高于7 K时，顺磁性状态遵循修正的居里-外斯行为（X=C/（T-theta）+X 0，其中X 0 =0.008（1）emu/mole，温度依赖项反映Tm子系统的顺磁性：ueff=7.6（2）uB [与游离Tm 3+离子的预期值一致]，θ = -4.5（3）K。Tm亚晶格的长程铁磁有序在~1 K附近发展。TmCo 2B 2C在低于20 mK时没有检测到超导性，这一特征与RCo 2B 2C系列的总体趋势一致。最后，快淬工艺对TmNi_2B_2C的磁性（和超导电性）的影响将被讨论，并与TmCo_2B_2C的磁性（和超导电性）进行比较。
英文摘要：
A new quaternary intermetallic borocarbide TmCo2B2C has been synthesized via a rapid-quench of an arc-melted ingot. Elemental and powder-diffraction analyses established its correct stoichiometry and single-phase character. The crystal structure is isomorphous to that of TmNi2B2C(I4/mmm) and is stable over the studied temperature range. Above 7 K, the paramagnetic state follows the modified Curie-Weiss behavior (X=C/(T-theta)+X0 wherein X0=0.008(1) emu/mole and the temperature-dependent term reflecting the paramagnetism of the Tm subsystem: ueff=7.6(2) uB [in agreement with the expected value for a free Tm3+ ion] and theta = -4.5(3) K. Long range ferromagnetic order of the Tm sublattice is observed to develop around ~1 K. No superconductivity is detected in TmCo2B2C down to 20 mK, a feature which is consistent with the general trend in the RCo2B2C series. Finally, the influence of the rapid-quench process on the magnetism (and superconductivity) of TmNi2B2C will be discussed and compared to that of TmCo2B2C.
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