论文标题
强烈价ceirsn的抗铁磁相关性
Antiferromagnetic correlations in strongly valence fluctuating CeIrSn
论文作者
论文摘要
在六角形基平面中带有列木马CE晶格的CEIRSN是一种强烈的价波动化合物，正如我们通过硬X射线光电光谱和非弹性中子散射确认的，高近近伴有$ t _ {\ MATHRM {k}}} \ sim 480 $ \ \ kondo的高温。我们报告了平面内热膨胀$α/t $低于2 \，K，它通过宽的最小值接近0.75 \，k。 $ b \ parallel的体积和$ a $轴磁截图在低田间明显为负，在6 \ t的尖锐元磁异常之前更改标志。这些行为对于基于CE的中间价系统是出乎意料的，该系统应具有积极的扩张性。相反，它们指出在非常低温下的抗铁磁相关性。这是由MUON自旋弛豫测量值降低到0.1 \ K的支持，这为显微镜提供了内部磁场的广泛分布的证据。与同构CERHSN的比较表明，以$ t \ ll t _ {\ mathrm {k}} $形式出现的这些反铁磁相关性来自几何挫败感。
CeIrSn with a quasikagome Ce lattice in the hexagonal basal plane is a strongly valence fluctuating compound, as we confirm by hard x-ray photoelectron spectroscopy and inelastic neutron scattering, with a high Kondo temperature of $T_{\mathrm{K}}\sim 480$\,K. We report a negative in-plane thermal expansion $α/T$ below 2\,K, which passes through a broad minimum near 0.75\,K. Volume and $a$-axis magnetostriction for $B \parallel a$ are markedly negative at low fields and change sign before a sharp metamagnetic anomaly at 6\,T. These behaviors are unexpected for Ce-based intermediate valence systems, which should feature positive expansivity. Rather they point towards antiferromagnetic correlations at very low temperatures. This is supported by muon spin relaxation measurements down to 0.1\,K, which provide microscopic evidence for a broad distribution of internal magnetic fields. Comparison with isostructural CeRhSn suggests that these antiferromagnetic correlations emerging at $T\ll T_{\mathrm{K}}$ result from geometrical frustration.
