NQR and NMR spectra in odd-parity multipole material CeCoSi
NQR and NMR spectra in odd-parity multipole material CeCoSi
复制标题
奇宇称多极材料 CeCoSi 的 NQR 和 NMR 谱
DOI：
10.1103/physrevb.102.195147
复制
发表时间：
2020
影响因子：
3.7
通讯作者：
M. Yatsushiro and S. Hayami
中科院分区：
文献类型：
--
作者：
Hayami Satoru;Yanagi Yuki;Kusunose Hiroaki;M. Yatsushiro and S. Hayami
我们从理论上研究了NQR和NMR谱的奇宇称多极起源于交错的反铁磁和反铁四极有序的存在。对于电子金属CeCoSi，这是一个候选人主办奇宇称多极子，我们推导出一个有效的超精细场作用于一个Co核产生的Ce离子在零和非零磁场的电子原点多极矩。我们阐明，紧急奇宇称多极子引起的次晶格相关的光谱分裂的NQR和NMR通过有效的超精细耦合的情况下，全球反演对称性。我们主要研究了三种奇宇称多极有序态的核四极共振谱和核磁共振谱的行为：具有交错型反铁磁结构的a型磁环偶极有序态、具有交错（）型反铁四极结构的a型电环四极有序态和具有交错（）型反铁四极结构的a型电偶极有序态.我们发现，不同的奇宇称多极子的顺序导致不同的场依赖的光谱分裂在NMR，而只有型电环形四极子的顺序表现出NQR光谱分裂。我们还提出了可能的子晶格依赖的光谱分裂的所有奇宇称多极订单潜在激活的低能量晶体场的水平，这将是有用的，以确定奇宇称顺序参数CeCoSi的NQR和NMR测量。
We study theoretically NQR and NMR spectra in the presence of odd-parity multipoles originating from staggered antiferromagnetic and antiferroquadrupole orderings. For the-electron metal CeCoSi, which is a candidate hosting odd-parity multipoles, we derive an effective hyperfine field acting on a Co nucleus generated from electronic origin multipole moments of the Ce ion in zero and nonzero magnetic fields. We elucidate that emergent odd-parity multipoles give rise to sublattice-dependent spectral splittings in NQR and NMR through the effective hyperfine coupling in the absence of global inversion symmetry. We mainly examine the behaviors of the NQR and NMR spectra in three odd-parity multipole ordered states: a-type magnetic toroidal dipole order with a staggered-type antiferromagnetic structure, an-type electric toroidal quadrupole order with a staggered ()-type antiferroquadrupole structure, and a-type electric dipole order with a staggered ()-type antiferroquadrupole structure. We show that different odd-parity multipole orders lead to different field-dependent spectral splittings in NMR, while only the-type electric toroidal quadrupole order exhibits the NQR spectral splitting. We also present possible sublattice-dependent spectral splittings for all the odd-parity multipole orders potentially activated in low-energy crystal-field levels, which will be useful to identify odd-parity order parameters in CeCoSi by NQR and NMR measurements.