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Mott transition

About: Mott transition is a research topic. Over the lifetime, 2444 publications have been published within this topic receiving 78401 citations.


Papers
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Journal ArticleDOI
TL;DR: This work will show the symmetric dynamic behaviour with respect to field reversal and it will compare it with the asymmetric behaviour observed at the dynamic vortex Mott transition, to capture the essential characteristics of a collective dynamics.
Abstract: As the complexity of strongly correlated systems and high temperature superconductors increases, so does also the essential complexity of defects found in these materials and the complexity of the supercurrent pathways. It can be therefore convenient to realize a solid-state system with regular supercurrent pathways and without the disguising effects of disorder in order to capture the essential characteristics of a collective dynamics. Using a square array of superconducting islands placed on a normal metal, we observe a state in which magnetic field-induced vortices are frozen in the dimples of the egg crate potential by their strong repulsion interaction. In this system a dynamic vortex Mott insulator transition has been previously observed. In this work, we will show the symmetric dynamic behaviour with respect to field reversal and we will compare it with the asymmetric behaviour observed at the dynamic vortex Mott transition.

2 citations

Journal ArticleDOI
TL;DR: In this article, the anisotropic metamagnetic (MM) behavior of Ca 2− x Sr x RuO 4 (for x = 0.2) was investigated at high magnetic fields.
Abstract: Here, we report a study on the anisotropic metamagnetic (MM) behavior of Ca 2− x Sr x RuO 4 (for x =0.2) by electrical transport and magnetization measurements at high magnetic fields ( B ). With increasing field as the MM transition is crossed and when B is rotated between the inter-plane and one of the in-plane axis, we observe a crossover from Fermi liquid (FL) to non-FL behavior. Furthermore, the inter-plane resistivity shows sinusoidal behavior displaying a two-fold periodicity when a small magnetic field is rotated in the conducting planes. But as the B is increased, a new four-fold periodicity emerges, suggesting nanophase separation between orthorhombic and tetragonal domains.

2 citations

Dissertation
01 Jan 2014
TL;DR: In this article, the authors investigated the influence of spin fluctuation on the Mott metal-insulator transition and the zero temperature quantum critical metamagnetic endpoint of itinerant ferromagnets.
Abstract: Solid state phase transitions, which are amenable to pressure, generically, have an intrinsic coupling of the order parameter to the elastic degrees of freedom. The applied pressure primarily affects the lattice by varying the lattice spacing which, in turn, modifies the coupling constants of the critical degrees of freedom. Therefore, a coupling of the strain to the order parameter can strongly affect the phase transition. In this Thesis we investigate this influence on the finite temperature critical point of the Mott metal-insulator transition and the zero temperature quantum critical metamagnetic endpoint. The universality class of the Mott endpoint is a topic which is still under debate. In this Thesis, we show that the nature of the Mott transition is drastically changed when interacting with a compressible lattice. The expected Ising criticality of the electronic system is preempted by an isostructural instability. Due to long ranged shear forces, in the vicinity of the critical endpoint an elastic Landau regime emerges, where the system shows mean-field behavior. The smoking gun criterion to detect the elastic Landau regime is the breakdown of Hooke's law, i.e. a non-linear stress-strain relation. Furthermore, the specific heat coefficient exhibits a finite mean field jump at the transition. For the family of organic salts Kappa-(BEDT-TTF)_2 X, we determine the extent of the elastic Landau regime as \Delta T^\star \approx 2.5 K and \Delta p^\star \approx 50 bar based on thermal expansion experiments. In the second part, we investigate the quantum critical endpoint of itinerant metamagnets. Recently, it was suggested that quantum critical metamagnetism is a generic feature in itinerant ferromagnets such as UCoAl and UGe_2. Within the framework of spin fluctuation theory, we determine the free energy and its temperature dependence, obtained by fluctuation renormalizations, and deduce the critical thermodynamics. Importantly, the compressibility shows the same behavior as the susceptibility which, by definition, diverges at a metamagnetic transition. Therefore, the metamagnetic quantum critical endpoint is intrinsically unstable towards an isostructural transition. This isostructural transition preempts the metamagnetic quantum critical endpoint and the elastic degrees of freedom crucially alter the critical thermodynamics. Most importantly, at the critical field we obtain for lowest but finite temperatures a regime of critical elasticity which is characterized by unusual power laws of the thermodynamic quantities. Whereas the thermal expansion has a much stronger temperature divergence for fields close to the critical field, the specific heat divergence is cut off upon entering this regime. As a consequence, the Gruneisen parameter diverges with an unusual high power of temperature.

2 citations

Journal ArticleDOI
TL;DR: In this paper, the Mott metal-insulator transition in the two-band Hubbard model in infinite dimensions is studied by using the linearized dynamical mean-field theory, and the discontinuity in the chemical potential for the change from hole to electron doping is calculated analytically as a function of the on-site Coulomb interaction U, and the charge-transfer energy Δ between the d - and p -orbitals, transfer integrals t p d, t p p, t d d between p-d, p-p, and d-d sites respectively.
Abstract: The Mott metal–insulator transition in the two-band Hubbard model in infinite dimensions is studied by using the linearized dynamical mean-field theory. The discontinuity in the chemical potential for the change from hole to electron doping is calculated analytically as a function of the on-site Coulomb interaction U , and the charge-transfer energy Δ between the d - and p -orbitals, transfer integrals t p d , t p p , t d d between p – d , p – p , and d – d sites respectively. The critical behaviour of the quasiparticle weight is also obtained analytically.

2 citations

Journal ArticleDOI
TL;DR: In this article, the 3D core-level X-ray photoemission spectra of various ruthenates were examined and two peak structures, which can be assigned as the screened and unscreened peaks, were used to reveal the Mott transition phenomenon in various strongly correlated electron systems.
Abstract: Ru 3d core-level X-ray photoemission spectra of various ruthenates are examined. They show in general two-peak structures, which can be assigned as the screened and unscreened peaks. The screened peak is absent in a Mott insulator, but develops into a main peak as the correlation strength becomes weak. This spectral behavior is well explained by the dynamical mean-field theory calculation for the single-band Hubbard model with the on-site core-hole potential using the exact diagonalization method. The new mechanism of the core-level photoemission satellite can be utilized to reveal the Mott transition phenomenon in various strongly correlated electron systems.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202271
202165
202064
201968
201871