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A nematic order in stripe-ordered cuprates was recently identified with (001) reflection at resonant energies associated with the in-plane states. However, whether this resonant reflection is ubiquitous among all 214 cuprates is still unknown. Here w

Externí odkaz: http://arxiv.org/abs/1707.04367

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Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO$_3$

Autor: Holm, S. L., Kreisel, A., Schäffer, T. K., Bakke, A., Bertelsen, M., Hansen, U. B., Retuerto, M., Larsen, J., Prabhakaran, D., Deen, P. P., Yamani, Z., Birk, J. O., Stuhr, U., Niedermayer, Ch., Fennell, A. L., Andersen, B. M., Lefmann, K.

Publikováno v: Phys. Rev. B 97, 134304 (2018)

Inelastic neutron scattering has been used to study the magneto-elastic excitations in the multiferroic manganite hexagonal YMnO$_3$. An avoided crossing is found between magnon and phonon modes close to the Brillouin zone boundary in the $(a,b)$-pla

Externí odkaz: http://arxiv.org/abs/1707.02468

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Distinct nature of static and dynamic magnetic stripes in cuprate superconductors

Autor: Jacobsen, H., Holm, S. L., Lacatusu, M. -E., Rømer, A. T., Bertelsen, M., Boehm, M., Toft-Petersen, R., Grivel, J. -C., Emery, S. B., Udby, L., Wells, B. O., Lefmann, K.

Publikováno v: Phys. Rev. Lett. 120, 037003 (2018)

We present detailed neutron scattering studies of the static and dynamic stripes in an optimally doped high-temperature superconductor, La$_2$CuO$_{4+y}$. We find that the dynamic stripes do not disperse towards the static stripes in the limit of van

Externí odkaz: http://arxiv.org/abs/1704.08528

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