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Comin et al. [Science 347, 1335 (2015)] have interpreted their resonant X-ray scattering experiment as indicating that charge inhomogeneities in the family of high-temperature superconductors YBa2Cu3O6+y (YBCO) have the character of…

Superconductivity · Physics 2016-02-03 Boris V. Fine

We consider the effects of charge ordering in NaV_2O_5 (below T_SP) on the exchange constants and on the magnon dispersion. We show that the experimentally observed splitting of the magnon branches along the a direction is induced by charge…

Condensed Matter · Physics 2009-10-31 Cladius Gros , Roser Valenti

Experiments on carrier recombination in two-dimensional organic structures are often interpreted in the frame of the Langevin model with taking into account only the drift of the charge carriers in their mutual electric field. While this…

Disordered Systems and Neural Networks · Physics 2012-01-10 A. V. Nenashev , F. Jansson , S. D. Baranovskii , R. Österbacka , A. V. Dvurechenskii , F. Gebhard

We present a band structure study of orbital polarization and ordering in the two-dimensional triangular lattice transition metal compounds LiVO_2 and NaTiO_2. It is found that while in NaTiO_2 the degeneracy of t_{2g} orbitals is lifted…

Strongly Correlated Electrons · Physics 2009-10-30 S. Yu. Ezhov , V. I. Anisimov , H. F. Pen , D. I. Khomskii , G. A. Sawatzky

Using spectral ellipsometry, we have measured the dielectric function of a Na$_{0.82(2)}$CoO$_2$ crystal that exhibits bulk antiferromagnetism with T$_{N}$=19.8 K. We identify two prominent transitions as a function of temperature. The…

Strongly Correlated Electrons · Physics 2009-11-10 C. Bernhard , A. V. Boris , N. N. Kovaleva , G. Khaliullin , A. Pimenov , L. Yu , D. P. Chen , C. T. Lin , B. Keimer

We present a scenario for the peculiar coexistence of charge fluctuations observed in quasi-2D 1/4-filled organic conductors $\theta$-(BEDT-TTF)$_2X$ in the quantum critical regime where the charge ordering is suppressed down to zero…

Strongly Correlated Electrons · Physics 2009-11-13 Masafumi Udagawa , Yukitoshi Motome

Classic and recent results for gauge effects on the properties of the normal-to-superconducting phase transition in bulk and thin film superconductors are reviewed. Similar problems in the description of other natural systems (liquid…

Superconductivity · Physics 2016-08-31 D. V. Shopova , T. E. Tsvetkov , D. I. Uzunov

Here we report an unconventional magnetic and transport phenomenon in a layered cobalt oxide, NaxCoO2. Only for x = 0.75, a magnetic transition of the second order was clearly detected at Tm ~ 22 K where an apparent specific-heat jump, an…

Strongly Correlated Electrons · Physics 2009-11-07 T. Motohashi , R. Ueda , E. Naujalis , T. Tojo , I. Terasaki , T. Atake , M. Karppinen , H. Yamauchi

We show that the experimental evidence presented in this paper is insufficient to support its conclusions.

Strongly Correlated Electrons · Physics 2015-06-10 Y. Lu , E. Benckiser , B. Keimer

We study anomalous charged fluid in $2n$-dimensions ($n\geq 2$) up to sub-leading derivative order. Only the effect of gauge anomaly is important at this order. Using the Euclidean partition function formalism, we find the constraints on…

High Energy Physics - Theory · Physics 2015-05-20 Nabamita Banerjee , Suvankar Dutta , Akash Jain

Nelson et al. [Phys. Rev. B 95, 054118 (2017)] recently have reported first-principles calculations on the behaviour of group-II difluorides (BeF$_{2}$, MgF$_{2}$, and CaF$_{2}$) under high-pressure and low- and high-temperature conditions.…

Materials Science · Physics 2018-12-19 Claudio Cazorla , Daniel Errandonea

Optical conductivity of the trellis lattice t-J model at quarter filling is calculated by an exact-diagonalization technique on small clusters, whereby the valence state of V ions of NaV_2O_5 is considered. We show that the experimental…

Strongly Correlated Electrons · Physics 2009-10-31 S. Nishimoto , Y. Ohta

Measurements of polarization-dependent soft x-ray absorption reveal that the electronic states determining the low-energy excitations of Na$_{x}$CoO$_2$ have predominantly $a_{1g}$ symmetry with significant O $2p$ character. A large…

Strongly Correlated Electrons · Physics 2009-11-10 W. B. Wu , D. J. Huang , J. Okamoto , A. Tanaka , H. -J. Lin , F. C. Chou , A. Fujimori , C. T. Chen

We provide a reply to a comment by I. Goychuk arXiv:1708.04155, version v2 from 27 Aug 2017 (not under active consideration with Phys. Rev. Lett.), on our Letter E. Aghion, D. A. Kessler and E. Barkai, Phys. Rev. Lett., 118, 260601 (2017).

Statistical Mechanics · Physics 2017-10-17 Erez Aghion , David A. Kessler , Eli Barkai

Experimental data available in the literature on the diagonal resistivity of GaAs/AlGaAs heterostructures in a magnetic field at the filling factor 1/2 have been compared with the existing theoretical prediction [B. I. Halperin et al.,…

Mesoscale and Nanoscale Physics · Physics 2015-05-13 S. S. Murzin

We investigate the magnetic field dependence of the spin-Peierls transition in NaV$_2$O$_5$ in the field range 16T-30T. The transition temperature exhibits a very weak variation with the field, suggesting a novel mechanism for the formation…

Strongly Correlated Electrons · Physics 2009-10-31 S. G. Bompadre , Arthur F. Hebard , Valeri N. Kotov , D. Hall , G. Maris , J. Baas , T. T. M. Palstra

We describe forms with non-Abelian charges. We avoid the use of theories with flat curvatures by working in the context of topological field theory. We obtain TQFTs for a form and its dual. We leave open the question of getting gauges in…

High Energy Physics - Theory · Physics 2009-10-31 L. Baulieu

The strength and effect of Coulomb correlations in the (superconducting when hydrated) x~1/3 regime of Na(x)CoO(2) have been evaluated using the correlated band theory LDA+U method. Our results, neglecting quantum fluctuations, are: (1)…

Strongly Correlated Electrons · Physics 2007-05-23 J. Kunes , K. -W. Lee , W. E. Pickett

This is a Comment on a recent Letter (Phys.Rev.Lett.93, 247002 (2004)) written by Dalidovich and Yang. It is pointed out that any Pauli-limited approach neglecting the vortices is inapplicable to describing the FFLO state in CeCoIn5.

Superconductivity · Physics 2009-11-11 Ryusuke Ikeda , Hiroto Adachi

Gauge effects on the fluctuation properties of the normal-to-superconducting phase transition in bulk and thin film superconductors are reviewed. Similar problems in the description of other natural systems (liquid crystals, quantum field…

Superconductivity · Physics 2016-08-31 Diana V. Shopova , Dimo I. Uzunov