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NaOsO3 has recently attracted significant attention for the strong coupling between its electronic band structure and magnetic ordering. Here, we used time-resolved magnetic x-ray diffraction to determine the timescale of the photoinduced antiferromagnetic dynamics in NaOsO3. Our measurements are consistent with a sub-100 fs melting of the antiferromagnetic long-range order that occurs significantly faster than the lattice dynamics as monitored by the transient change in intensity of selected Bragg structural reflections, which instead show a decrease of intensity on a timescale of several ps.

The authors find that the structural distortion and the underlying electronic structure of the charge density wave in TiSe${}_{2}$ show different energetics at ultrafast timescales.

We have used muon spin rotation and relaxation (

We have used muon spin rotation and relaxation (μSR) and 23Na nuclear magnetic resonance (NMR) spectroscopic methods in the NaOsO3 antiferromagnetic phase to determine the temperature evolution of the magnetic order parameter and the role of the magnetic fluctuations at the Néel temperature. Additionally, we performed muon spin relaxation measurements in the vicinity of TA = 30 K, where the appearance of an anomaly in the electrical resistivity was suggested to be due to a progressive reduction of the Os magnetic moment associated with spin fluctuation. Our measurements suggest the absence of prominent change in the spin fluctuations frequency at TA, within the muon probing time scale and the absence of a reduction of the localized Os magnetic moment reflected by the stability within few permille of the local magnetic field strength sensed by the muons below 50 K.

Magnetic ground states with peculiar spin textures, such as magnetic skyrmions and multifunctional domains are of enormous interest for the fundamental physics governing their origin as well as potential applications in emerging technologies. Of particular interest are multiferroics, where sophisticated interactions between electric and magnetic phenomena can be used to tailor several functionalities. We report the direct observation of a magnetic field induced long-wavelength spin spiral modulation in the chiral compound Ba3TaFe3Si2O14, which emerges out of a helical ground state, and is hallmarked by the onset of a unique chirality-dependent contribution to the bulk electric polarization. The periodicity of the field-induced modulation, several hundreds of nm depending on the field value, is comparable to the length scales of mesoscopic topological defects such as skyrmions, merons, and solitons. The phase transition and observed threshold behavior are consistent with a phenomenology based on the allowed Lifshitz invariants for the chiral symmetry of langasite, which intriguingly contain all the essential ingredients for the realization of topologically stable antiferromagnetic skyrmions. Our findings open up new directions to explore topological correlations of antiferromagnetic spintronic systems based on non-collinear magnetic systems with additional ferroic functionalities., npj Quantum Materials, 4 (1), ISSN:2397-4648

Objectives: to identify the number of students experiencing dysmennrohea, to assess the knowledge regarding dysmennrohea and its health-seeking behavior among the female student population, to determine the association between knowledge regarding dysmennrohea and its health-seeking behavior with the variables. Methods: A Descriptive survey of 80 female college students were done using a structured knowledge questionnaire and health-seeking behavior tools during the month of February 2014 at Center of Computer and Communication Technology, Chisopani, South Sikkim, India. Simple random sampling was used to select the college and purposive sampling technique was used to select the sample. Results: Majority 65% were of 18-21 years of age, 50% were Hindu, 100% were unmarried. About 42.5% had family monthly income of 15000 and above. Educational status of mother of about 40% was secondary, 36.25% belonged to extended family. Age of menarche of 78.75% was 13-14years, 96.25% had 3-7 days of menstruation, 40% used 3-4 pads during 1st day of menstruation, 71.25% used 3-4 pads during 2nd day of menstruation, 67.5% had menstrual cycle of 21-35 days. Majority 65% received information on health seeking behavior from their female relatives. Majority 64(78.75%) had experienced painful menstruation among which 70.31% consumed hot liquids, 70.31% took medicines, 3.12% took chocolate and 1.35% tied stomach with scarf as health seeking behavior. Majority 76.25% participants had moderate knowledge regarding dysmenorrhea and its health seeking behavior. There was no significant association between knowledge regarding dysmenorrhea and its health seeking behavior. Conclusion: The study showed that majority of the females college students had moderate knowledge and various health seeking behaviors regarding dysmennrohea.

The correlation between electronic and crystal structures of 1T-TiSe2 in the charge density wave (CDW) state is studied by x-ray diffraction. Three families of reflections are used to probe atomic displacements and the orbital asymmetry in Se. Two distinct onset temperatures are found, TCDW and a lower T* indicative for an onset of Se out-of-plane atomic displacements. T* coincides with a DC resistivity maximum and the onset of the proposed gyrotropic electronic structure. However, no indication for chirality is found. The relation between the atomic displacements and the transport properties is discussed in terms of Ti 3d and Se 4p states that only weakly couple to the CDW order., Comment: 16 pages, 4 figures + 13 pages supplementary info