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Physical Review X ; 11(3):9, 2021.
Article in English | Web of Science | ID: covidwho-1398211


The combination of nontrivial band topology and symmetry-breaking phases gives rise to novel quantum states and phenomena such as topological superconductivity, quantum anomalous Hall effect, and axion electrodynamics. Evidence of intertwined charge density wave (CDW) and superconducting order parameters has recently been observed in a novel kagome material AV(3)Sb(5) (A = K, Rb, Cs) that features a Z(2) topological invariant in the electronic structure. However, the origin of the CDW and its intricate interplay with the topological state has yet to be determined. Here, using hard-x-ray scattering, we demonstrate a three-dimensional CDW with 2 x 2 x 2 superstructure in (Rb, Cs)V3Sb5. Unexpectedly, we find that the CDW fails to induce acoustic phonon anomalies at the CDW wave vector but yields a novel Raman mode that quickly damps into a broad continuum below the CDW transition temperature. Our observations exclude strong electron-phonon-coupling-driven CDW in AV(3)Sb(5) and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.

Journal of Experimental and Clinical Medicine (Turkey) ; 38(2):150-153, 2021.
Article in English | EMBASE | ID: covidwho-1224456


Cats are the main host of Toxoplasma gondii and pregnant women who own cats at home may be at risk. This condition may cause anxiety and stress in pregnant women. The aim of this study is to evaluate toxoplasmosis risk on anxiety and perception of cat owner pregnant women. The study group consisted of 59 pregnant women feeding cats in the home and 369 pregnant women not feeding cats. A Health Anxiety Inventory (HAI-18) was used to measure the anxiety of all participants. Age and anxiety variables were analyzed using a two-sample independent t-test. Gravida, education, and job status were analyzed using chi-square tests, and live to abort ratio & pregnancy number were analyzed using Fisher exact test. Measurement of the anxiety level between the two groups showed that anxiety is significantly higher among the pregnant women who feed cats in their house with an average of 32.03±8.72. The average anxiety level among the pregnant women who don't have cats in their house was 25.94±8.99. The difference between the Health Anxiety Inventory of the two groups was significant (p= 0.0001) It was shown in the literature that pets can reduce anxiety but not studied in pregnant women, yet. Our results showed that pregnant women who own cats at home had more environmental anxiety than women who don’t feed cats at home which is possibly associated with fear of Toxoplasma gondii transmission. This anxiety may also cause unfavorable pregnancy outcomes like eclampsia, preterm birth, low birth weight and high incidence of cesarean delivery.