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首页> 外文期刊>Physical review >Crystallography, magnetic susceptibility, heat capacity, and electrical resistivity of heavy-fermion LiV_2O_4 single crystals grown using a self-flux technique
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Crystallography, magnetic susceptibility, heat capacity, and electrical resistivity of heavy-fermion LiV_2O_4 single crystals grown using a self-flux technique

机译:自磁通技术生长的重费米LiV_2O_4单晶的晶体学,磁化率,热容和电阻率

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摘要

Magnetically pure spinel compound LiV_2O_4 is a rare d-electron heavy fermion. Measurements on single crystals are needed to clarify the mechanism for the heavy-fermion behavior in the pure material. In addition, it is known that small concentrations ( < 1 mol %) of magnetic defects in the structure strongly affect the properties, and measurements on single crystals containing magnetic defects would help to understand the latter behaviors. Herein, we report flux growth of LiV_2O_4 and preliminary measurements to help resolve these questions. The magnetic susceptibility of some as-grown crystals show a Curie-like upturn at low temperatures, showing the presence of magnetic defects within the spinel structure. The magnetic defects could be removed in some of the crystals by annealing them at 700℃. A very high specific heat coefficient γ =450 mJ/mol K~2 was obtained at a temperature of 1.8 K for a crystal containing a magnetic defect concentration n_(defect)=0.5 mol %. A crystal with n_(defect)=0.01 mol % showed a residual resistivity ratio of 50.
机译:磁性纯尖晶石化合物LiV_2O_4是一种稀有的d电子重元素。需要对单晶进行测量以阐明纯材料中重费米行为的机理。此外,已知结构中的磁性缺陷浓度较小(<1 mol%)会极大地影响性能,对包含磁性缺陷的单晶进行测量将有助于理解后者的行为。在此,我们报告LiV_2O_4的通量增长和初步测量以帮助解决这些问题。一些晶体的磁化率在低温下显示出居里样的上翻现象,表明尖晶石结构内存在磁性缺陷。可以通过在700℃下退火来去除某些晶体中的磁缺陷。对于包含磁性缺陷浓度n_(缺陷)= 0.5mol%的晶体,在1.8K的温度下获得非常高的比热系数γ= 450mJ / mol K-2。 n_(缺陷)= 0.01 mol%的晶体的残余电阻率比为50。

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