Presentation - Dagotto Group
... tend to antiferromagnetically couple to other Mn atoms, reducing the magnetization saturation The bonding configuration also introduces a double donor, overcompensating the single donor Mn cation subs (As antisites also are double donors) ...
... tend to antiferromagnetically couple to other Mn atoms, reducing the magnetization saturation The bonding configuration also introduces a double donor, overcompensating the single donor Mn cation subs (As antisites also are double donors) ...
numerical evidence of the haldane conjecture
... Every updating of a cluster algorithm starts by introducing a random unit vector and separating the components parallel and perpendicular to it for all spins (Swendsen-Wang, Wolff), ...
... Every updating of a cluster algorithm starts by introducing a random unit vector and separating the components parallel and perpendicular to it for all spins (Swendsen-Wang, Wolff), ...
Ising Model of a ferromagnetic spin system
... In MC, we simulate the microscopic states of the spin system, and then take averages of these states. The experimentally measured physical quantities (e.g., heat capacity, magnetization, magnetic susceptibility) are, in the language of statistical physics, the averages of these microscopic states. T ...
... In MC, we simulate the microscopic states of the spin system, and then take averages of these states. The experimentally measured physical quantities (e.g., heat capacity, magnetization, magnetic susceptibility) are, in the language of statistical physics, the averages of these microscopic states. T ...
Structural, electric, and magnetic properties of Mn perovskites
... The cooperative ordering of this Jahn-Teller distortion results in the corresponding magnetic, i.e. spin, order in a system from the semicovalent exchange interaction by Goodenough. [3] In this interaction, the semicovalent bond is described as the bond formed by overlapping between the empty hybrid ...
... The cooperative ordering of this Jahn-Teller distortion results in the corresponding magnetic, i.e. spin, order in a system from the semicovalent exchange interaction by Goodenough. [3] In this interaction, the semicovalent bond is described as the bond formed by overlapping between the empty hybrid ...
Chem+174–Lecture7b
... called Electron Spin Resonance (ESR), was reported by Zavoisky in 1945 EPR is a versatile and non-destructive spectroscopic method of analysis, which can be applied to inorganic, organic, and biological materials containing one or more unpaired electrons The technique depends on the resonant abs ...
... called Electron Spin Resonance (ESR), was reported by Zavoisky in 1945 EPR is a versatile and non-destructive spectroscopic method of analysis, which can be applied to inorganic, organic, and biological materials containing one or more unpaired electrons The technique depends on the resonant abs ...
Organic spintronics: Filtering spins with molecules
... Figure 1 | Working principle of a spin valve. a,b, A conventional spin valve is made of two layers of magnetic material that are separated by a non-magnetic spacer (top panels). Depending on the mutual orientation of the magnetizations of the magnetic layers, the device can be in a, a low-resistance ...
... Figure 1 | Working principle of a spin valve. a,b, A conventional spin valve is made of two layers of magnetic material that are separated by a non-magnetic spacer (top panels). Depending on the mutual orientation of the magnetizations of the magnetic layers, the device can be in a, a low-resistance ...
Slide 1
... devices that are both faster and consume less power than the current devices. To realize this potential materials where the spins of the mobile electrons are spin polarized are needed. The double perovskite Sr2CrReO6 is one such promising material. Theoretical studies predict that at room temperatur ...
... devices that are both faster and consume less power than the current devices. To realize this potential materials where the spins of the mobile electrons are spin polarized are needed. The double perovskite Sr2CrReO6 is one such promising material. Theoretical studies predict that at room temperatur ...
Geometrical frustration
In condensed matter physics, the term geometrical frustration (or in short: frustration) refers to a phenomenon, where atoms tend to stick to non-trivial positions or where, on a regular crystal lattice, conflicting inter-atomic forces (each one favoring rather simple, but different structures) lead to quite complex structures. As a consequence of the frustration in the geometry or in the forces, a plenitude of distinct ground states may result at zero temperature, and usual thermal ordering may be suppressed at higher temperatures. Much studied examples are amorphous materials, glasses, or dilute magnets.The term frustration, in the context of magnetic systems, has been introduced by Gerard Toulouse (1977). Indeed, frustrated magnetic systems had been studied even before. Early work includes a study of the Ising model on a triangular lattice with nearest-neighbor spins coupled antiferromagnetically, by G. H. Wannier, published in 1950. Related features occur in magnets with competing interactions, where both ferro- as well as antiferromagnetic couplings between pairs of spins or magnetic moments are present, with the type of interaction depending on the separation distance of the spins. In that case commensurability, such as helical spin arrangements may result, as had been discussed originally, especially, by A. Yoshimori, T. A. Kaplan, R. J. Elliott, and others, starting in 1959, to describe experimental findings on rare-earth metals. A renewed interest in such spin systems with frustrated or competing interactions arose about two decades later, beginning in the 70s of the 20th century, in the context of spin glasses and spatially modulated magnetic superstructures. In spin glasses, frustration is augmented by stochastic disorder in the interactions, as may occur, experimentally, in non-stoichiometric magnetic alloys. Carefully analyzed spin models with frustration include the Sherrington-Kirkpatrick model, describing spin glasses, and the ANNNI model, describing commensurability magnetic superstructures.