Anisotropic excitonic magnetism from discrete $\mathrm{C}_{4}$ symmetry in CeRhIn$_{5}$
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2024
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| author | Brener, D. J. Mallo, I. Rodriguez Lane, H. Rodriguez-Rivera, J. A. Schmalzl, K. Songvilay, M. Guratinder, K. Petrovic, C. Stock, C. |
| author_facet | Brener, D. J. Mallo, I. Rodriguez Lane, H. Rodriguez-Rivera, J. A. Schmalzl, K. Songvilay, M. Guratinder, K. Petrovic, C. Stock, C. |
| contents | Anisotropy in strongly correlated materials is a central parameter in determining the electronic ground state and is tuned through the local crystalline electric field. This is notably the case in the CeCo$_{x}$Rh$_{1-x}$In$_{5}$ system where the ground-state wave function can provide the basis for antiferromagnetism and/or unconventional superconductivity. We develop a methodology to understand the local magnetic anisotropy and experimentally investigate with neutron spectroscopy applied to antiferromagnetic ($T_{N}$=3.8 K) CeRhIn$_{5}$ which is isostructural to $d$-wave superconducting ($T_{c}$=2.3 K) CeCoIn$_{5}$. Through diagonalizing the local crystal field Hamiltonian with discrete tetragonal $\mathrm{C}_{4}$ point group symmetry and coupling these states with the Random Phase Approximation (RPA), we find two distinct modes polarized along the crystallographic $c$ and $a-b$ planes, agreeing with experiment. The anisotropy and bandwidth, underlying the energy scale of these modes, are tuneable with a magnetic field which we use experimentally to separate in energy single and multiparticle excitations thereby demonstrating the instability of excitations polarized within the crystallographic $a-b$ plane in CeRhIn$_{5}$. We compare this approach to a $S_{eff}={1\over 2}$ parameterizations and argue for the need to extend conventional SU(2) theories of magnetic excitations to utilize the multi-level nature of the underlying crystal-field basis states constrained by the local point-group $\mathrm{C}_{4}$ symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_10158 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anisotropic excitonic magnetism from discrete $\mathrm{C}_{4}$ symmetry in CeRhIn$_{5}$ Brener, D. J. Mallo, I. Rodriguez Lane, H. Rodriguez-Rivera, J. A. Schmalzl, K. Songvilay, M. Guratinder, K. Petrovic, C. Stock, C. Strongly Correlated Electrons Superconductivity Anisotropy in strongly correlated materials is a central parameter in determining the electronic ground state and is tuned through the local crystalline electric field. This is notably the case in the CeCo$_{x}$Rh$_{1-x}$In$_{5}$ system where the ground-state wave function can provide the basis for antiferromagnetism and/or unconventional superconductivity. We develop a methodology to understand the local magnetic anisotropy and experimentally investigate with neutron spectroscopy applied to antiferromagnetic ($T_{N}$=3.8 K) CeRhIn$_{5}$ which is isostructural to $d$-wave superconducting ($T_{c}$=2.3 K) CeCoIn$_{5}$. Through diagonalizing the local crystal field Hamiltonian with discrete tetragonal $\mathrm{C}_{4}$ point group symmetry and coupling these states with the Random Phase Approximation (RPA), we find two distinct modes polarized along the crystallographic $c$ and $a-b$ planes, agreeing with experiment. The anisotropy and bandwidth, underlying the energy scale of these modes, are tuneable with a magnetic field which we use experimentally to separate in energy single and multiparticle excitations thereby demonstrating the instability of excitations polarized within the crystallographic $a-b$ plane in CeRhIn$_{5}$. We compare this approach to a $S_{eff}={1\over 2}$ parameterizations and argue for the need to extend conventional SU(2) theories of magnetic excitations to utilize the multi-level nature of the underlying crystal-field basis states constrained by the local point-group $\mathrm{C}_{4}$ symmetry. |
| title | Anisotropic excitonic magnetism from discrete $\mathrm{C}_{4}$ symmetry in CeRhIn$_{5}$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2408.10158 |