<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Thermodynamic and Magnetic Studies\r\non Correlated Electron Systems\r\nwith Competing Interactions"^^ . "In this work the ground states and thermodynamic properties of selected materials with\r\ncompeting magnetic interactions are investigated mainly by heat capacity and magnetization studies down to low temperatures and in high magnetic fields. Due to replacement of\r\nMn2+ by Ni2+, competing magnetic anisotropies and mixed spins in Ni0.25Mn0.75TiO3 yield\r\na suppression of long-range magnetic order as compared to its undoped parent compound\r\nand a spin-reoriented low-temperatures phase appears. While short-ranged magnetic order\r\npersists up to about 4 × TN, glass-like behavior, a quasi-linear temperature dependence of\r\nthe specific heat and the presence of weakly-coupled moments highlight the unusual ground\r\nstate and its thermal excitations. Geometric frustration is studied in the example of the\r\ndisordered pyrochlore structure Ho2Zr2O7 and is evidenced by the absence of long-range\r\nmagnetic order at least down to T = 280 mK. The analysis of residual entropy excludes\r\na spin ice state in Ho2Zr2O7. Instead, it exhibits a disordered ground state with shortranged antiferromagnetic correlations and a spin-frozen state below T = 0.6 K is found.\r\nMagnetic frustration is also relevant in the hexagonal systems Nd3BWO9 and Pr3BWO9 in\r\nwhich the rare earth ions form a distorted Kagom´e lattice. Again, no long-range magnetic\r\norder appears in Pr3BWO9 at least down to T = 90 mK while Nd3BWO9 orders antiferromagnetically at TN = 0.3 K. In the former, specific heat shows a Schottky anomaly at\r\nT = 5.7(4) K. Magnetic entropy changes in both systems suggest an effective Jeff = 1/2\r\norbital ground state. While Nd3BWO9 exhibits field-induced spin freezing at T∗ = 4.3 K\r\nas shown by AC-susceptibility data, Pr3BWO9 does not show such field-induced anomalies. A narrow 1\r\n3-magnetization plateau is observed in Nd3BWO9 at ∼ 0.8 T whereas in\r\nPr3BWO9, the magnetization increases monotonically with increasing the field with no\r\nsigns of plateaus. In both systems, the theoretical saturation magnetization is not reached\r\neven in high-magnetic fields of B = 58 T and no further magnetization plateaus appear\r\nin the high field regime."^^ . "2023" . . . . . . . "Ahmed Elghandour"^^ . "Shetiwy"^^ . "Ahmed Elghandour Shetiwy"^^ . . . . . . "Thermodynamic and Magnetic Studies\r\non Correlated Electron Systems\r\nwith Competing Interactions (PDF)"^^ . . . "Diss_2023_Ahmed Eltamimy Abdelrahman Elghandour Shetiwy.pdf"^^ . . . "Thermodynamic and Magnetic Studies\r\non Correlated Electron Systems\r\nwith Competing Interactions (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Thermodynamic and Magnetic Studies\r\non Correlated Electron Systems\r\nwith Competing Interactions (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Thermodynamic and Magnetic Studies\r\non Correlated Electron Systems\r\nwith Competing Interactions (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Thermodynamic and Magnetic Studies\r\non Correlated Electron Systems\r\nwith Competing Interactions (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Thermodynamic and Magnetic Studies\r\non Correlated Electron Systems\r\nwith Competing Interactions (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #34165 \n\nThermodynamic and Magnetic Studies \non Correlated Electron Systems \nwith Competing Interactions\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .