نتایج جستجو برای: antiferromagnetism
تعداد نتایج: 4003 فیلتر نتایج به سال:
Abstract The two-dimensional Quantum Hall effect with no external magnetic field is called the anomalous (QAH) effect. So far, experimentally realized QAH insulators all exhibit ferromagnetic order and only occurs at very low temperatures. On other hand, up to now in collinear antiferromagnetic (AFM) materials has never been reported corresponding mechanism proposed. In this work, we realize by...
The incommensurate spin fluctuation of the doped triangular antiferromagnet is studied within the t-J model. It is shown that the commensurate peak near the half-filling is split into six incommensurate peaks in the underdoped and optimally doped regimes. The incommensurability increases with the hole concentration at lower dopings, and saturates at higher dopings. Although the incommensurabili...
We consider an extended Hubbard model of interacting fermions on a lattice. The fermion kinetic energy corresponds to a tight binding Hamiltonian with nearest neighbour (−t) and next nearest neighbour (t ′) hopping matrix elements. In addition to the onsite Hubbard interaction (U) we also consider a nearest neighbour repulsion (V). We obtain the zero temperature phase diagram of our model withi...
Understanding the interplay between charge order (CO) and other phenomena (for example, pseudogap, antiferromagnetism, and superconductivity) is one of the central questions in the cuprate high-temperature superconductors. The discovery that similar forms of CO exist in both hole- and electron-doped cuprates opened a path to determine what subset of the CO phenomenology is universal to all the ...
The effect of the shell thickness and density on the magnetic properties of composite colloidal particles consisting of a hematite (alpha-Fe(2)O(3)) core and an yttrium oxide (Y(2)O(3)) layer is described. Pure iron oxide colloidal spheres show two clearly different trends of variation of their magnetic susceptibility, chi(m), with temperature. Below T(M) approximately 220 K, chi(m) shows a sli...
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