Zobrazeno 1 - 10
of 353
pro vyhledávání: '"Niedermayer Ch."'
Autor:
Chan, E., Pásztorová, J., Johnson, R. D., Songvilay, M., Downie, R. A., Bos, J-W. G., Fabelo, O., Ritter, C., Beauvois, K., Niedermayer, Ch., Cheong, S. -W., Qureshi, N., Stock, C.
Publikováno v:
Phys. Rev. B 106, 064403 (2022)
MnSb$_{2}$O$_{6}$ is based on the structural chiral $P$321 space group #150 where the magnetic Mn$^{2+}$ moments ($S=5/2$, $L\approx 0$) order antiferromagnetically at $T_\mathrm{N}=12$ K. Unlike the related iron based langasite (Ba$_3$NbFe$_3$Si$_2$
Externí odkaz:
http://arxiv.org/abs/2207.10977
Autor:
Freeman P.G., Birk J.O., Markó M., Bertelsen M., Larsen J., Christensen N.B., Lefmann K., Jacobsen J., Niedermayer Ch., Juranyi F., Ronnow H.M.
Publikováno v:
EPJ Web of Conferences, Vol 83, p 03005 (2015)
The CAMEA ESS neutron spectrometer is designed to achieve a high detection efficiency in the horizontal scattering plane, and to maximize the use of the long pulse European Spallation Source. It is an indirect geometry time-of-flight spectrometer tha
Externí odkaz:
https://doaj.org/article/d54f8adfe55d4a06a7cbbb759671c3f9
Autor:
Lane, H., Rodriguez, E. E., Walker, H. C., Niedermayer, Ch., Stuhr, U., Bewley, R. I., Voneshen, D. J., Green, M. A., Rodriguez-Rivera, J. A., Fouquet, P., Cheong, S. -W., Attfield, J. P., Ewings, R. A., Stock, C.
Publikováno v:
Phys. Rev. B 104, 104404 (2021)
CaFe$_{2}$O$_{4}$ is an $S=5/2$ antiferromagnet exhibiting two magnetic orders which shows regions of coexistence at some temperatures. Using a Green's function formalism, we model neutron scattering data of the spin wave excitations in this material
Externí odkaz:
http://arxiv.org/abs/2108.09679
Autor:
Holm-Dahlin, S., Larsen, J., Jacobsen, H., Rømer, A. T., Ţuţueanu, A. -E., Ahmad, M., Grivel, J. -C., Scheuermann, R., Zimmermann, M. v., Boehm, M., Steffens, P., Niedermayer, Ch., Pedersen, K. S., Christensen, N. B., Wells, B. O., Lefmann, K., Udby, L.
We present a combined neutron diffraction and high field muon spin rotation ($\mu$SR) study of the magnetically ordered and superconducting phases of the high-temperature superconductor La$_{1.94}$Sr$_{0.06}$CuO$_{4+y}$ ($T_{\rm c} = 37.5(2)$~K) in a
Externí odkaz:
http://arxiv.org/abs/2101.10672
Autor:
Edwards, L., Lane, H., Arevalo-Lopez, A. M., Songvilay, M., Pachoud, E., Niedermayer, Ch., Tucker, G., Manuel, P., Paulsen, C., Lhotel, E., Attfield, J. P., Giblin, S. R., Stock, C.
$\alpha$-CoV$_{2}$O$_{6}$ consists of $j_{\mathrm{eff}}={1 \over 2}$ Ising spins located on an anisotropic triangular motif with magnetization plateaus in an applied field. We combine neutron diffraction with low temperature magnetization to investig
Externí odkaz:
http://arxiv.org/abs/2010.14097
Autor:
Stock, C., Johnson, R. D., Giles-Donovan, N., Songvilay, M., Rodriguez-Rivera, J. A., Lee, N., Xu, X., Radaelli, P. G., Chapon, L. C., Bombardi, A., Cochran, S., Niedermayer, Ch., Schneidewind, A., Husges, Z., Lu, Z., Meng, S., Cheong, S. -W.
Publikováno v:
Phys. Rev. B 100, 134429 (2019)
Ba$_{3}$NbFe$_{3}$Si$_{2}$O$_{14}$ (langasite) is structurally and magnetically single domain chiral with the magnetic helicity induced through competing symmetric exchange interactions. Using neutron scattering, we show that the spin-waves in antife
Externí odkaz:
http://arxiv.org/abs/1910.01977
Autor:
Lass, J., Andersen, Ch. Røhl, Leerberg, H. K., Birkemose, S., Toth, S., Stuhr, U., Bartkowiak, M., Niedermayer, Ch., Lu, Zhilun, Toft-Petersen, R., Retuerto, M., Birk, J. Okkels, Lefmann, K.
Publikováno v:
Phys. Rev. B 101, 054415 (2020)
Using single crystal neutron scattering we show that the magnetic structure Ni$_3$TeO$_6$ at fields above 8.6 T along the $c$ axis changes from a commensurate collinear antiferromagnetic structure with spins along c and ordering vector $Q_C$= (0 0 1.
Externí odkaz:
http://arxiv.org/abs/1909.13734
Autor:
Stock, C., Rodriguez, E. E., Lee, N., Demmel, F., Fouquet, P., Laver, M., Niedermayer, Ch., Su, Y., Nemkovski, K., Green, M A., Rodriguez-Rivera, J. A., Kim, J. W., Zhang, L., Cheong, S. -W.
Publikováno v:
Phys. Rev. Lett. 119, 257204 (2017)
CaFe$_{2}$O$_{4}$ is an anisotropic $S={5\over 2}$ antiferromagnet with two competing $A$ ($\uparrow \uparrow \downarrow \downarrow$) and $B$ ($\uparrow \downarrow \uparrow \downarrow$) magnetic order parameters separated by static antiphase boundari
Externí odkaz:
http://arxiv.org/abs/1712.02853
Autor:
Ray, P. J., Andersen, N. H., Jensen, T. B. S., Mohottala, H. E., Niedermayer, Ch., Lefmann, K., Wells, B. O., Zimmermann, M. v., Udby, L.
Publikováno v:
Phys. Rev. B 96, 174106 (2017)
We present high energy X-ray diffraction studies on the structural phases of an optimal high-$T_c$ superconductor La$_{2-x}$Sr$_x$CuO$_{4+y}$ tailored by co-hole-doping. This is specifically done by varying the content of two very different chemical
Externí odkaz:
http://arxiv.org/abs/1707.08871
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