Site-specific Knight shift measurements of the dilute Kondo lattice system Ce1−xLaxCoIn5
Site-specific Knight shift measurements of the dilute Kondo lattice system Ce1−xLaxCoIn5
复制标题
DOI：
10.1103/physrevb.99.165106
复制
发表时间：
2019-01
影响因子：
3.7
通讯作者：
M. Lawson;Blaine Bush;A. Shockley;C. Capan;Z. Fisk;N. Curro
中科院分区：
文献类型：
--
作者：
M. Lawson;Blaine Bush;A. Shockley;C. Capan;Z. Fisk;N. Curro
本文给出了一系列不同La稀释度$x$的${\ mathm {Ce}}_{1\ensuremath{-}x}{\ mathm {La}}_{x}{\ mathm {CoIn}}_{5}$晶体的$^{115}\ mathm {In}$核磁共振数据。与不同数量的最近邻铈原子相关的多个In(1)位表现出不同的奈特位移和自旋晶格弛豫速率。对这些位置的温度依赖性的分析揭示了重电子相干性作为稀释函数的演化，以及与La位置附近反铁磁波动完全抑制相关的空间非均匀性。尽管比热在稀释样品中显示费米液体行为，但量子临界涨落在未连接的Ce团簇中仍然存在，稀释水平高达75%。
$^{115}\mathrm{In}$ nuclear magnetic resonance data are presented for a series of ${\mathrm{Ce}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{CoIn}}_{5}$ crystals with different La dilutions $x$. Multiple In(1) sites associated with different numbers of nearest-neighbor cerium atoms exhibit different Knight shifts and spin lattice relaxation rates. Analysis of the temperature dependence of these sites reveals both an evolution of the heavy electron coherence as a function of dilution, as well as spatial inhomogeneity associated with a complete suppression of antiferromagnetic fluctuations in the vicinity of the La sites. Quantum critical fluctuations persist within disconnected Ce clusters with dilution levels up to 75%, despite the fact that specific heat shows Fermi liquid behavior in dilute samples.