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arXiv 0908.0294cond-mat.str-el
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Mn $_{1-x}$ Fe $_x$ Si单晶的电阻率:量子临界行为的证据

Resistivity of Mn$_{1-x}$Fe$_x$Si single crystals: Evidence for quantum critical behavior

C. Meingast, Q. Zhang, Th. Wolf, F. Hardy, K. Grube, W. Knafo, P. Adelmann, P. Schweiss, H. v. Lohneysen

摘要:

在2 ~ 300 K温度范围内,对Mn $_{1-x}$ Fe $_x$ Si单晶进行了电阻率测量,测量温度为$x$ = 0,0.05,0.08,0.12和0.15。发现Fe掺杂将磁有序温度从$x$ = 0的30 K降低到$x$ = 0.15的2K以下。虽然Fe掺杂导致低温剩余电阻率大幅增加,但磁性转变上方的电阻率的温度依赖性几乎不受Fe含量增加的影响。的电阻率的温度导数的分析提供了强有力的证据附近的$x$ = 0.15的非费米液体的基态的存在,从而为量子临界点调谐的Fe含量。

英文摘要:

Resistivity measurements have been made on Mn$_{1-x}$Fe$_x$Si single crystals between 2 and 300K for $x$ = 0, 0.05, 0.08, 0.12 and 0.15. Fe doping is found to depress the magnetic ordering temperature from 30K for $x$ = 0 to below 2K for $x$ = 0.15. Although Fe doping results in a large increase of the low-temperature residual resistivity, the temperature dependence of the resistivity above the magnetic transition remains practically unaffected by increasing Fe content. An analysis of the temperature derivative of the resistivity provides strong evidence for the existence of a non-Fermi-liquid ground state near $x$ = 0.15 and thus for a quantum critical point tuned by Fe content.

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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