Metamagnetism and crystal-field splitting in pseudohexagonal CeRh3Si2
| Autor: | Amorese, A, Khalyavin, D, Kummer, K, Brookes, NB, Ritter, C, Zaharko, O, Larsen, CB, Pavlosiuk, O, Pikul, AP, Kaczorowski, D, Gutmann, M, Boothroyd, AT, Severing, A, Adroja, DT |
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| Rok vydání: | 2022 |
| Zdroj: | 'Physical Review B ', vol: 105, pages: 125119-1-125119-15 (2022) |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.105.125119 |
| Popis: | CeRh 3 Si 2 has been reported to exhibit metamagnetic transitions below 5 K, a giant crystal field splitting, and anisotropic magnetic properties from single crystal magnetization and heat capacity measurements. Here we report results of neutron and x-ray scattering studies of the magnetic structure and crystal-field excitations to further understand the magnetism of this compound. Inelastic neutron scattering and resonant inelastic x-ray scattering reveal a J z = 1 / 2 ground state for Ce when considering the crystallographic a direction as quantization axis, thus explaining the anisotropy of the static susceptibility. Furthermore, we find a total splitting of 78 meV for the J = 5 / 2 multiplet. The neutron diffraction study in zero field reveals that, on cooling from the paramagnetic state, the system first orders at T N 1 = 4.7 K in a longitudinal spin density wave with ordered Ce moments along the b axis (i.e., the [0 1 0] crystal direction) and an incommensurate propagation vector k = ( 0 , 0.43 , 0 ). Below the lower-temperature transition T N 2 = 4.48 K , the propagation vector locks to the commensurate value k = ( 0 , 0.5 , 0 ) , with a so-called lock-in transition. Our neutron diffraction study in applied magnetic field H ∥ b axis shows a change in the commensurate propagation vector and development of a ferromagnetic component at H = 3 kOe , followed by a series of transitions before the fully field-induced ferromagnetic phase is reached at H = 7 kOe . This explains the nature of the steps previously reported in field-dependent magnetization measurements. A very similar behavior is also observed for the H ∥ [0 1 1] crystal direction. |
| Databáze: | OpenAIRE |
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