Magnetic structure and crystal field states of antiferromagnetic CeNiGe$_3$: Neutron scattering and $μ$SR investigations
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| Format: | Preprint |
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2024
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| author | Kataria, A. Kumar, R. Adroja, D. T. Ritter, C. Anand, V. K. Hillier, A. D. Huddart, B. M. Lancaster, T. Rols, S. Koza, M. M. Langridge, Sean Sundaresan, A. |
| author_facet | Kataria, A. Kumar, R. Adroja, D. T. Ritter, C. Anand, V. K. Hillier, A. D. Huddart, B. M. Lancaster, T. Rols, S. Koza, M. M. Langridge, Sean Sundaresan, A. |
| contents | We present the results of microscopic investigations of antiferromagnetic CeNiGe$_3$, using neutron powder diffraction (NPD), inelastic neutron scattering (INS), and muon spin relaxation ($μ$SR) measurements. CeNiGe$_3$ crystallizes in a centrosymmetric orthorhombic crystal structure (space group: $Cmmm$) and undergoes antiferromagnetic (AFM) ordering. The occurrence of long-range AFM ordering at $T_{\rm N} \approx 5.2$~K is confirmed by magnetic susceptibility, heat capacity, neutron diffraction, and $μ$SR measurements. The NPD data characterize the AFM state with an incommensurate helical magnetic structure having a propagation vector $k$ = (0, 0.41, 1/2). In addition, INS measurements at 10~K identified two crystal electric field (CEF) excitations at 9.17~meV and 18.42~meV. We analyzed the INS data using a CEF model for an orthorhombic environment of Ce$^{3+}$ ($J=5/2$) and determined the CEF parameters and ground state wavefunctions of CeNiGe$_3$. Moreover, zero-field $μ$SR data for CeNiGe$_3$ at $T< T_{\rm N}$ show long-range AFM ordering with three distinct oscillation frequencies corresponding to three different internal fields at the muon sites. The internal fields at the muon-stopping sites have been further investigated using density functional theory calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_05656 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic structure and crystal field states of antiferromagnetic CeNiGe$_3$: Neutron scattering and $μ$SR investigations Kataria, A. Kumar, R. Adroja, D. T. Ritter, C. Anand, V. K. Hillier, A. D. Huddart, B. M. Lancaster, T. Rols, S. Koza, M. M. Langridge, Sean Sundaresan, A. Strongly Correlated Electrons Materials Science We present the results of microscopic investigations of antiferromagnetic CeNiGe$_3$, using neutron powder diffraction (NPD), inelastic neutron scattering (INS), and muon spin relaxation ($μ$SR) measurements. CeNiGe$_3$ crystallizes in a centrosymmetric orthorhombic crystal structure (space group: $Cmmm$) and undergoes antiferromagnetic (AFM) ordering. The occurrence of long-range AFM ordering at $T_{\rm N} \approx 5.2$~K is confirmed by magnetic susceptibility, heat capacity, neutron diffraction, and $μ$SR measurements. The NPD data characterize the AFM state with an incommensurate helical magnetic structure having a propagation vector $k$ = (0, 0.41, 1/2). In addition, INS measurements at 10~K identified two crystal electric field (CEF) excitations at 9.17~meV and 18.42~meV. We analyzed the INS data using a CEF model for an orthorhombic environment of Ce$^{3+}$ ($J=5/2$) and determined the CEF parameters and ground state wavefunctions of CeNiGe$_3$. Moreover, zero-field $μ$SR data for CeNiGe$_3$ at $T< T_{\rm N}$ show long-range AFM ordering with three distinct oscillation frequencies corresponding to three different internal fields at the muon sites. The internal fields at the muon-stopping sites have been further investigated using density functional theory calculations. |
| title | Magnetic structure and crystal field states of antiferromagnetic CeNiGe$_3$: Neutron scattering and $μ$SR investigations |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2411.05656 |