Zobrazeno 1 - 10
of 206
pro vyhledávání: '"Sobolev O"'
Autor:
Guo, H., Li, Z. W., Zhao, L., Hu, Z., Chang, C. F., Kuo, C. -Y., Schmidt, W., Piovano, A., Pi, T. W., Sobolev, O., Khomskii, D. I., Tjeng, L. H., Komarek, A. C.
Publikováno v:
Nature Communications 9, 43 (2018)
The material class of rare earth nickelates with high Ni$^{3+}$ oxidation state is generating continued interest due to the occurrence of a metal-insulator transition with charge order and the appearance of non-collinear magnetic phases within this i
Externí odkaz:
http://arxiv.org/abs/1705.02589
Autor:
Simutis, G., Gvasaliya, S., Beesetty, N. S., Yoshida, T., Robert, J., Petit, S., Kolesnikov, A. I., Stone, M. B., Bourdarot, F., Walker, H. C., Adroja, D. T., Sobolev, O., Hess, C., Masuda, T., Revcolevschi, A., Büchner, B., Zheludev, A.
Publikováno v:
PRB 95, 054409 (2017)
The low energy magnetic excitation spectrum of the Heisenberg antiferromagnetic $S = 1/2$ chain system Sr$_2$CuO$_3$ with Ni- and Ca-impurities is studied by neutron spectroscopy. In all cases, a defect-induced spectral pseudogap is observed and show
Externí odkaz:
http://arxiv.org/abs/1611.04183
Autor:
Li, Z. W., Drees, Y., Kuo, C. Y., Guo, H., Ricci, A., Lamago, D., Sobolev, O., Rütt, U., Gutowski, O., Pi, T. W., Piovano, A., Schmidt, W., Mogare, K., Hu, Z., Tjeng, L. H., Komarek, A. C.
Publikováno v:
Scientific Reports 6, 25117 (2016)
We observe quasi-static incommensurate magnetic peaks in neutron scattering experiments on layered cobalt oxides La2-xSrxCoO4 with high Co oxidation states that have been reported to be paramagnetic. This enables us to measure the magnetic excitation
Externí odkaz:
http://arxiv.org/abs/1604.08389
Autor:
Li, Z. W., Drees, Y., Ricci, A., Lamago, D., Piovano, A., Rotter, M., Schmidt, W., Sobolev, O., Rütt, U., Gutowski, O., Sprung, M., Castellan, J. P., Tjeng, L. H., Komarek, A. C.
The single-layer perovskite cobaltates have attracted enormous attention due to the recent observation of hour-glass shaped magnetic excitation spectra which resemble the ones of the famous high-temperature superconducting cuprates. Here, we present
Externí odkaz:
http://arxiv.org/abs/1601.01795
Autor:
Drees, Y., Li, Z. W., Ricci, A., Rotter, M., Schmidt, W., Lamago, D., Sobolev, O., Rütt, U., Gutowski, O., Sprung, M., Piovano, A., Castellan, J. P., Komarek, A. C.
Publikováno v:
Nature Communications 5, 5731 (2014)
The magnetic excitations in the cuprate superconductors might be essential for an understanding of high-temperature superconductivity. In these cuprate superconductors the magnetic excitation spectrum resembles an hour-glass and certain resonant magn
Externí odkaz:
http://arxiv.org/abs/1507.01783
Autor:
Stock, C., Rodriguez, E. E., Sobolev, O., Rodriguez-Rivera, J. A., Ewings, R. A., Taylor, J. W., Christianson, A. D., Green, M. A.
Publikováno v:
Phys. Rev. B 90, 12113(R) (2014)
Neutron spectroscopy is used to investigate the magnetic fluctuations in Fe_{1+x}Te - a parent compound of chalcogenide superconductors. Incommensurate "stripe-like" excitations soften with increased interstitial iron concentration. The energy crosso
Externí odkaz:
http://arxiv.org/abs/1409.4051
Autor:
Qureshi, N., Steffens, P., Lamago, D., Sidis, Y., Sobolev, O., Ewings, R. A., Harnagea, L., Wurmehl, S., Büchner, B., Braden, M.
We present an inelastic neutron scattering study on single-crystalline LiFeAs devoted to the characterization of the incommensurate antiferromagnetic fluctuations at $\mathbf{Q}=(0.5\pm\delta, 0.5\mp\delta, q_l)$. Time-of-flight measurements show the
Externí odkaz:
http://arxiv.org/abs/1407.0247
Autor:
Wen, Jinsheng, Li, Shichao, Xu, Zhijun, Zhang, Cheng, Matsuda, M., Sobolev, O., Park, J. T., Christianson, A. D., Bourret-Courchesne, E., Li, Qiang, Gu, Genda, Lee, Dung-Hai, Tranquada, J. M., Xu, Guangyong, Birgeneau, R. J.
Publikováno v:
Phys. Rev. B 88, 144509 (2013)
We have performed resistivity and inelastic neutron scattering measurements on three samples of Fe0.98-zCuzTe0.5Se0.5 with z = 0, 0.02, and 0.1. It is found that with increasing Cu doping the sample's resistivity deviates progressively from that of a
Externí odkaz:
http://arxiv.org/abs/1310.3064
Autor:
Rodriguez, E. E., Sokolov, D. A., Stock, C., Green, M. A., Sobolev, O., Rodriguez-Rivera, J. A., Cao, H., Daoud-Aladine, A.
Publikováno v:
Phys. Rev. B 88, 165110 (2013)
We construct a phase diagram of the parent compound Fe1+xTe as a function of interstitial iron x in terms of the electronic, structural, and magnetic properties. For a concentration of x < 10%, Fe1+xTe undergoes a "semimetal" to metal transition at a
Externí odkaz:
http://arxiv.org/abs/1309.6310
Autor:
Friemel, G., Liu, W. P., Goremychkin, E. A., Liu, Y., Park, J. T., Sobolev, O., Lin, C. T., Keimer, B., Inosov, D. S.
Publikováno v:
EPL 99, 67004 (2012)
Spin excitations stemming from the metallic phase of the ferrochalcogenide superconductor K(0.77)Fe(1.85)Se(2) (T_c=32 K) were mapped out in the ab plane by means of the time-of-flight neutron spectroscopy. We observed a magnetic resonant mode at Q_r
Externí odkaz:
http://arxiv.org/abs/1208.5033