Hyperfine couplings as a probe of orbital anisotropy in heavy-fermion materials
Hyperfine couplings as a probe of orbital anisotropy in heavy-fermion materials
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DOI：
10.1103/physrevb.104.035154
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发表时间：
2020-10
影响因子：
3.7
通讯作者：
P. Menegasso;J. Souza;I. Vinograd;Z. Wang;S. Edwards;P. Pagliuso;N. Curro;R. Urbano
中科院分区：
文献类型：
--
作者：
P. Menegasso;J. Souza;I. Vinograd;Z. Wang;S. Edwards;P. Pagliuso;N. Curro;R. Urbano
在重费米子材料中，核自旋和电子自旋之间的转移超精细相互作用依赖于$f$-电子轨道和远核周围轨道之间的杂化。在CeMIn$_5$（M=Rh，Ir，Co）中，两个铟位的超精细耦合以及Ce处的晶体电场都强烈地依赖于过渡金属。我们测量了一系列CeRh $1-x}$Ir $x $In $5 $晶体，发现超精细耦合反映了基态Ce 4 $f $波函数的轨道各向异性。这些发现提供了直接的证据，本地化的巡回过渡是占主导地位的杂交在该系统中的Ce-In平面。
The transferred hyperfine interaction between nuclear and electron spins in an heavy fermion material depends on the hybridization between the $f$-electron orbitals and those surrounding a distant nucleus. In CeMIn$_5$ (M=Rh, Ir, Co), both the hyperfine coupling to the two indium sites as well as the crystalline electric field at the Ce are strongly dependent on the transition metal. We measure a series of CeRh$_{1-x}$Ir$_x$In$_5$ crystals and find that the hyperfine coupling reflects the orbital anisotropy of the ground state Ce 4$f$ wavefunction. These findings provide direct proof that the localized to itinerant transition is dominated by hybridization out of the Ce-In plane in this system.