Zobrazeno 1 - 10
of 202
pro vyhledávání: '"Lamago, D."'
Publikováno v:
Phys. Rev. B 97, 245139 (2018)
According to standard theory the magnetoresistance magnitude in ferromagnetic manganites crucially depends on the electron-phonon coupling strength. We showed that in La0.7Sr0.3MnO3 the phonon renormalization is strong, despite its relatively small m
Externí odkaz:
http://arxiv.org/abs/1805.05596
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
Among colossal magnetoresistive manganites the prototypical ferromagnetic manganite La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ has a relatively small magnetoresistance, and has been long assumed to have only weak electron-lattice coupling. Here we report that La$
Externí odkaz:
http://arxiv.org/abs/1510.01600
Autor:
Krannich, S., Lamago, D., Manske, D., Bauer, E., Prokofiev, A., Heid, R., Bohnen, K. -P., Weber, F.
Publikováno v:
Physical Review B 92, 125137 (2015)
Motivated by model calculations for the heavy fermion superconductor CePt3Si predicting phonon anomalies because of anti-symmetric spin-orbit coupling we performed a detailed experimental study of the lattice dynamical properties of CePt3Si. In parti
Externí odkaz:
http://arxiv.org/abs/1508.06048
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., Gehring, P. M., Xu, G., Lamago, D., Reznik, D., Russina, M., Wen, J., Boatner, L. A.
Publikováno v:
Phys. Rev. B 90, 224302 (2014)
We report neutron scattering measurements of the structural correlations associated with the apparent relaxor transition in K$_{1-x}$Li$_x$TaO$_3$ for $x=0.02$ (KLT(0.02)). This compound displays a broad and frequency-dependent peak in the dielectric
Externí odkaz:
http://arxiv.org/abs/1505.05439
Autor:
Parshall, D., Pintschovius, L., Lamago, D., Castellan, J. -P., Niedziela, J. L., Wolf, Th., Reznik, D.
Publikováno v:
Phys. Rev. B 91, 134426 (2015)
Parent compounds of Fe-based superconductors undergo a structural phase transition from a tetragonal to an orthorhombic structure. We investigated the temperature dependence of the frequencies of transverse acoustic (TA) phonons that extrapolate to t
Externí odkaz:
http://arxiv.org/abs/1410.7761
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:
Park, S. R., Fukuda, T., Hamann, A., Lamago, D., Pintschovius, L., Fujita, M., Yamada, K., Reznik, D.
Publikováno v:
Phys. Rev. B 89, 020506(R) (2014)
In superconducting copper oxides some Cu-O bond-stretching phonons around 70meV show anomalous giant softening and broadening of electronic origin and electronic dispersions have large renormalization kinks near the same energy. These observations su
Externí odkaz:
http://arxiv.org/abs/1401.1111