Self-organization of charge under pressure in the organic conductor (TMTSF)2ReO4

(TMTSF)2ReO4 presents a phase coexistence between two anion orderings defined by their wave vectors q_2=(1/2,1/2,1/2) and q_3=(0,1/2,1/2) in a wide range of pressure (8-11kbar) and temperature. From the determination of the anisotropy of the conductivity and the superconducting transitions in this regime we were able to extract the texture which results from a self-organization of the orientations of the ReO4 anions in the sample. At the lowest pressures, the metallic parts, related to the q_3 order, form droplets elongated along the a-axis embedded in the semiconducting matrix associated with the q_2 order. Above 10kbar, filaments along the a-axis extend from one end of the sample to the other nearly up to the end of the coexistence regime. A mapping of the system into an anisotropic Ising lattice is satisfactory to analyze the data. satisfactory to analyze the data.Comment: 7 pages, 3 figures, EPL forma

Antun Polanšćak, Od povjerenja do sumnje. Problemi francuske književnosti (De la confiance au doute. Problèmes de la littérature française), Zagreb, "Naprijed", 1966, pp. 307.

Antun Polanšćak, Od povjerenja do sumnje. Problemi francuske književnosti (De la confiance au doute. Problèmes de la littérature française), Zagreb, "Naprijed", 1966, pp. 307

Unconventional spin density wave in Bechgaard salt (TMTSF)2NO3

Among many Bechgaard salts, TMTSF2NO3 exhibits very anomalous low temperature properties. Unlike conventional spin density wave (SDW), TMTSF2NO3 undergoes the SDW transition at \T_SDW\approx 9.5 K and the low temperature quasiparticle excitations are gapless. Also, it is known that TMTSF2NO3 does not exhibit superconductivity even under pressure, while FISDW is found in TMTSF2NO3 only for P=8.5 kbar and B>20 T. Here we shall show that both the angle dependent magnetoresistance data and the nonlinear Hall resistance of TMTSF2NO3 at ambient pressure are interpreted satisfactory in terms of unconventional spin density wave (USDW). Based on these facts, we propose a new phase diagram for Bechgaards salts.Comment: 4 pages, 4 figs, RevTe

Effects of Lifshitz Transition on Charge Transport in Magnetic Phases of Fe-Based Superconductors

The unusual temperature dependence of the resistivity and its in-plane anisotropy observed in the Fe-based superconducting materials, particularly Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$, has been a longstanding puzzle. Here we consider the effect of impurity scattering on the temperature dependence of the average resistivity within a simple two-band model of a dirty spin density wave metal. The sharp drop in resistivity below the N\'eel temperature $T_N$ in the parent compound can only be understood in terms of a Lifshitz transition following Fermi surface reconstruction upon magnetic ordering. We show that the observed resistivity anisotropy in this phase, arising from nematic defect structures, is affected by the Lifshitz transition as well.Comment: 8 pages, 5 figure

Women in police profession: their vertical mobility and integration - the case study of the Belgrade ity police department of the Ministry of interior of the Republic of Serbia

Cilj ovog istraživanja bio je da se stekne uvid u profesionalnu integraciju i vertikalnu pokretljivost žena zaposlenih u Upravi policije za grad Beograd, kao osnovnim karakteristikama njihovog profesionalnog položaja. Integracija podrazumeva zastupljenost žena u svim sektorima i na svim nivoima policijskih službi, i mogućnost pristupa različitim resursima od značaja za profesiju. Vertikalna pokretljivost je specifičan aspekt integracije koji pokazuje koliko je za žene otvoren pristup položajima na kojima se donose odluke i upravlja resursima. U istraživanju smo analizirali problem na društvenom, organizacionom i individualnom nivou. Na društvenom nivou žene su u podređenom položaju u odnosu na muškarce jer je srpsko društvo patrijarhalno. Na organizacionoj ravni žene su, pod pritiskom efekta staklenog plafona, profesionalne marginalizacije i segregacije, manje zastupljene u operativnim policijskim poslovima i na rukovodećim položajima. Na nivou svakodnevnice, žene su dvostruko opterećene poslom i porodicom, a simultano ispunjavanje profesionalnih i porodičnih obaveza umanjuje njihove mogućnosti da se potpuno posvete policijskoj karijeri...The aim of this study was to gain insight into the professional integration and vertical mobility of women employed in the Belgrade City Police, as well as basic characteristics of their professional status. Integration involves the representation of women in all sectors and at all levels of police services, and access to various resources of importance to the profession. Vertical mobility is a specific aspect of integration that shows access for women to positions of decision-making and resources. In the study, we analyzed the problem on the social, organizational and individual level. At the social level, women are at a disadvantage compared to men because the Serbian society is patriarchal. At the organizational level, women are under pressure of effect of glass ceiling, professional marginalization and segregation, and their are less represented in operational police work and management positions. At the level of everyday life, women are doubly burdened with work and family, a simultaneous fulfillment of professional and family obligations which diminishes their ability to fully commit to a police career..

Hole-depletion of ladders in Sr14_{14}Cu24_{24}O41_{41} induced by correlation effects

The hole distribution in Sr$_{14}$Cu$_{24}$O$_{41}$ is studied by low temperature polarization dependent O K Near-Edge X-ray Absorption Fine Structure measurements and state of the art electronic structure calculations that include core-hole and correlation effects in a mean-field approach. Contrary to all previous analysis, based on semi-empirical models, we show that correlations and antiferromagnetic ordering favor the strong chain hole-attraction. For the remaining small number of holes accommodated on ladders, leg-sites are preferred to rung-sites. The small hole affinity of rung-sites explains naturally the 1D - 2D cross-over in the phase diagram of (La,Y,Sr,Ca)$_{14}$Cu$_{24}$O$_{41}$Comment: 6 pages, 8 figure

Local atomic structure and discommensurations in the charge density wave of CeTe3

The local structure of CeTe3 in the incommensurate charge density wave (IC-CDW) state has been obtained using atomic pair distribution function (PDF) analysis of x-ray diffraction data. Local atomic distortions in the Te-nets due to the CDW are larger than observed crystallographically, resulting in distinct short and long Te-Te bonds. Observation of different distortion amplitudes in the local and average structures are explained by the discommensurated nature of the CDW since the PDF is sensitive to the local displacements within the commensurate regions whereas the crystallographic result averages over many discommensurated domains. The result is supported by STM data. This is the first quantitative local structural study within the commensurate domains in an IC-CDW system.Comment: 4 pages, 4 figure