Zobrazeno 1 - 10
of 171
pro vyhledávání: '"Ewings, R. A."'
Autor:
Lane, H., Sarte, P. M., Guratinder, K., Arevalo-Lopez, A. M., Perry, R. S., Hunter, E. C., Weber, T., Roessli, B., Stunault, A., Su, Y., Ewings, R. A., Wilson, S. D., Böni, P., Attfield, J. P., Stock, C.
Publikováno v:
Phys. Rev. Research 5, 043146 (2023)
MgV$_{2}$O$_{4}$ is a spinel based on magnetic V$^{3+}$ ions which host both spin ($S=1$) and orbital ($l_{eff}=1$) moments. Owing to the underlying pyrochlore coordination of the magnetic sites, the spins in MgV$_{2}$O$_{4}$ only antiferromagnetical
Externí odkaz:
http://arxiv.org/abs/2309.06853
Autor:
Ewings, R. A., Reehuis, M., Orlandi, F., Manuel, P., Khalyavin, D. D., Gibbs, A. S., Fortes, A. D., Hoser, A., Princep, A. J., Jansen, M.
CsO2 is a member of the family of alkali superoxides (formula AO2 with A= Na, K, Rb and Cs) that exhibit magnetic behavior arising from open $p$-shell electrons residing on O2- molecules. We use neutron diffraction to solve the crystal and magnetic s
Externí odkaz:
http://arxiv.org/abs/2306.14724
Autor:
Jenni, K., Kunkemöller, S., Tewari, A., Ewings, R. A., Sidis, Y., Schneidewind, A., Steffens, P., Nugroho, A. A., Braden, M.
The magnetic excitations in ferromagnetic SrRuO$_3$ were studied by inelastic neutron scattering combining experiments on triple-axis and time-of-flight spectrometers with and without polarization analysis. A quadratic spin-wave dispersion with an an
Externí odkaz:
http://arxiv.org/abs/2305.05497
Autor:
Chan, E., Lane, H., Pásztorová, J., Songvilay, M., Johnson, R. D., Downie, R., Bos, J-W. G., Rodriguez-Rivera, J. A., Cheong, S. -W., Ewings, R. A., Qureshi, N., Stock, C.
Publikováno v:
Phys. Rev. B 107, 144420 (2023)
MnSb$_{2}$O$_{6}$ is based on the noncentrosymmetric $P321$ space group with magnetic Mn$^{2+}$ ($S={5/2}$, $L\approx 0$) spins ordering below $T_{\mathrm{N}}=12$ K in a helicoidal structure. The ground state magnetic structure, expected to be built
Externí odkaz:
http://arxiv.org/abs/2304.05732
RbFe$^{2+}$Fe$^{3+}$F$_{6}$ is an example of an antiferromagnet with charge ordering of the octahedrally coordinated Fe$^{2+}$ and Fe$^{3+}$ ions. As well as different spin values, Fe$^{2+}$ ($S=2$) and Fe$^{3+}$ ($S={5\over2}$) possess differing orb
Externí odkaz:
http://arxiv.org/abs/2207.11706
Neutron spectroscopy measurements have been performed on single crystals of the antiferromagnetic van der Waals compound NiPS$_3$. Linear spin wave theory using a Heisenberg Hamiltonian with single-ion anisotropies has been applied to determine the m
Externí odkaz:
http://arxiv.org/abs/2207.07448
Autor:
Morrison, K., Betouras, J. J., Venkat, G., Ewings, R. A., Caruana, A., Skokov, K., Gutfleisch, O., Cohen, L. F.
The NaZn13 type itinerant magnet LaFe13-xSix has seen considerable interest due to its unique combination of large magnetocaloric effect and low hysteresis. Here we demonstrate, with a combination of magnetometry, bespoke microcalorimetry and inelast
Externí odkaz:
http://arxiv.org/abs/2203.06010
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:
Lane, H., Pachoud, E., Rodriguez-Rivera, J. A., Songvilay, M., Xu, G., Gehring, P. M., Attfield, J. P., Ewings, R. A., Stock, C.
Publikováno v:
Phys. Rev. B 104, L020411 (2021)
VI$_{3}$ is a ferromagnet with planar honeycomb sheets of bonded V$^{3+}$ ions held together by van der Waals forces. We apply neutron spectroscopy to measure the two dimensional ($J/J_{c} \approx 17$) magnetic excitations in the ferromagnetic phase,
Externí odkaz:
http://arxiv.org/abs/2107.04311
Autor:
Bhattacharyya, A., Bhowmik, T. K., Adroja, D. T., Rahaman, B., Kar, S., Das, S., Saha-Dasgupta, T., Biswas, P. K., Sinha, T. P., Ewings, R. A., Khalyavin, D. D., Strydom, A. M.
Publikováno v:
Phys. Rev. B 103, 174423 (2021)
We report the signatures of dynamic spin fluctuations in the layered honeycomb Li$_3$Cu$_2$SbO$_6$ compound, with a 3$d$ S = 1/2 $d^9$ Cu$^{2+}$ configuration, through muon spin rotation and relaxation ($\mu$SR) and neutron scattering studies. Our ze
Externí odkaz:
http://arxiv.org/abs/2104.10859