Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"orbital order"”.
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Orbital order in iron-based superconductors
In this thesis, we propose that a ferro-orbital order, which breaks the degeneracy between the Fe $d_{xz}$ and $d_{yz}$ orbitals, is the effective cause of the structural and the magnetic transitions in the iron-based superconductors. We will discuss this orbital order in the framework of the …
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X-Ray Scattering Studies of Charge and Orbital Ordering in Transition Metal Oxides
This thesis focusses on the phenomena of charge ordering and orbital ordering in transition metal oxides, using the technique of resonant x-ray diffraction (RXD). The technique is suited to such studies, as it provides an elemental and band specific probe of long range electronic correlations. …
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Ladungs- und Orbitalordnungsphänomene in Übergangsmetalloxidverbindungen unter hydrostatischem Druck
… is dealing with the investigation of charge and orbital order and their behaviour under external pressure. Therefore, a new pressure cell has been developed which allows the observation of superlattice reflections corresponding to the order phenomena under pressure using scattering of high-energy …
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Ultrafast Terahertz Spectroscopy of Collective Excitations in Correlated Materials
… by a delicate balance among the lattice, charge, orbital, and spin degrees of freedom, leading to complex ground state phases. The lowest-energy collective excitations of a particular ground state serve as a fingerprint of the phase of matter, and revealing such collective modes can therefore …
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Magnetic-field- and pressure-tuned phases in LaxPryCa1−x−yMnO3 and Mn3O4: inelastic light scattering studies and single crystal growth
… thermal and field-induced melting of charge- and orbital-order (COO) in the (La,Pr,Ca)MnO3 system—including the role of disorder in the COO melting—and, furthermore, enable us to map out the structural and COO phases of these systems as functions of temperature and magnetic field. These studies …
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Ultrafast photoinduced phase transitions in complex materials probed by time-resolved resonant soft x-ray diffraction
… transitions) often accompanied by nanoscale order of spins, charges, orbital occupation and by lattice distortions, which make these material attractive. Magnetite served as a prototype for functional TMOs showing a metal-to-insulator-transition (MIT) at T = 123 K. By probing the charge and …
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Complex phase behavior of exotic oxides: optical spectroscopy studies
… correlations among charge, lattice, spin, and/or orbital degrees of freedom. In the low doping regime of R1_xDxMn03 (0.2 :::; x :::; 0.5), where a paramagnetic insulator to ferromagnetic metal transition takes place with a large value of magnetoresistance at the transition, we observed that …