Evolution of the magnetic structure in CeCu(5.5)Au(0.5) under pressure towards quantum criticality.
Evolution of the magnetic structure in CeCu(5.5)Au(0.5) under pressure towards quantum criticality.
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CeCu(5 5)Au(0 5) 中磁性结构在量子临界压力下的演化
DOI：
10.1103/physrevlett.110.096404
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发表时间：
2013
影响因子：
8.6
通讯作者：
H. v. Löhneysen
中科院分区：
文献类型：
--
作者：
A. Hamann;O. Stockert;V. Fritsch;K. Grube;A. Schneidewind;H. v. Löhneysen
在典型的重费米子系统中，磁量子临界点可以通过Au浓度、流体静压或磁场来调节。在热力学和输运性质方面，调谐行为与或发现了惊人的等价性。通过在单晶上的弹性中子散射，我们在微观水平上证明了这种等价性，表明磁序波矢量可以相应地调谐。在环境压力下，订单在。在施加时，发现与环境压力相对应。这一转变似乎是以一阶方式发生的，并受到费米面嵌套性质的微小变化的控制。
In the prototypical heavy-fermion system, a magnetic quantum critical point can be tuned by Au concentration, hydrostatic pressure, or magnetic field. A striking equivalence of the tuning behavior withorhad been found with respect to thermodynamic and transport properties. By means of elastic neutron scattering on single crystalline, we demonstrate thisequivalence <?format ?>on a microscopic level by showing that the magnetic ordering wave vectorcan be tuned accordingly. At ambient pressure,orders at. Upon applying,is found corresponding toat ambient pressure. The transition seems to occur in a first-order fashion and to be governed by slight changes in the nesting properties of the Fermi surface.