Zobrazeno 1 - 10
of 939
pro vyhledávání: '"JOHNSON, R. D."'
Autor:
Vaidya, S., Curley, S. P. M., Manuel, P., Stewart, J. Ross, Le, M. Duc, Balz, C., Shiroka, T., Blundell, S. J., Wheeler, K. A., Calderon-Lin, I., Manson, Z. E., Manson, J. L., Singleton, J., Lancaster, T., Johnson, R. D., Goddard, P. A.
Materials composed of spin-1 antiferromagnetic (AFM) chains are known to adopt complex ground states which are sensitive to the single-ion-anisotropy (SIA) energy ($D$), and intrachain ($J_{0}$) and interchain ($J'_{i}$) exchange energy scales. While
Externí odkaz:
http://arxiv.org/abs/2407.17894
Autor:
Johnson, R. D., Lovesey, S. W.
A recent experimental study of TbB4 at a low temperature using resonant x-ray Bragg diffraction implies a magnetic symmetry not found in any other rare-earth tetraboride. The evidence for this assertion is a change in the intensity of a TbB4 Bragg sp
Externí odkaz:
http://arxiv.org/abs/2406.17401
Autor:
Vaidya, S., Hernández-Melián, A., Tidey, J. P., Curley, S. P. M., Sharma, S., Manuel, P., Wang, C., Hannaford, G. L., Blundell, S. J., Manson, Z. E., Manson, J. L., Singleton, J., Lancaster, T., Johnson, R. D., Goddard, P. A.
Publikováno v:
Phys. Rev. B 110, 174438 (2024)
We investigate the magnetic properties of $S=1$ antiferromagnetic diamond lattice, Ni$X_{2}$(pyrimidine)$_{2}$ ($X$ = Cl, Br), hosting a single-ion anisotropy (SIA) orientation which alternates between neighbouring sites. Through neutron diffraction
Externí odkaz:
http://arxiv.org/abs/2405.15623
Autor:
Tardieux, M., Stylianidis, E., Behr, D., Liu, R., Yamaura, K., Khalyavin, D. D., Bowler, D. R., Belik, A. A., Johnson, R. D.
We report a phenomenological magneto-structural model based on competing free-energy terms that couple either polar or chiral distortions in cubic quadruple perovskites, depending on the global direction of magnetic moments. The model naturally expla
Externí odkaz:
http://arxiv.org/abs/2403.01889
Autor:
Vibhakar, A. M., Khalyavin, D. D., Manuel, P., Steinke, N. J., Zhang, L., Yamaura, K., Belik, A. A., Johnson, R. D.
A combination of competing exchange interactions and substitutional disorder gives rise to magnetic inhomogeneities in the [Y$_{2-x}$Mn$_x$]MnMnMn$_4$O$_{12}$ $x = 0.23$ and $x = 0.16$ quadruple perovskite manganites. Our neutron powder scattering me
Externí odkaz:
http://arxiv.org/abs/2305.01804
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
Autor:
Dashwood, C. D., Walker, A. H., Kwasigroch, M. P., Veiga, L. S. I., Faure, Q., Vale, J. G., Porter, D. G., Manuel, P., Khalyavin, D. D., Orlandi, F., Colin, C. V., Fabelo, O., Krüger, F., Perry, R. S., Johnson, R. D., Green, A. G., McMorrow, D. F.
Publikováno v:
Nat. Commun. 14, 6197 (2023)
The layered-ruthenate family of materials possess an intricate interplay of structural, electronic and magnetic degrees of freedom that yields a plethora of delicately balanced ground states. This is exemplified by Ca$_{3}$Ru$_{2}$O$_{7}$, which host
Externí odkaz:
http://arxiv.org/abs/2210.12555
Autor:
Faure, Q., Dashwood, C. D., Colin, C. V., Johnson, R. D., Ressouche, E., Stenning, G. B. G., Spratt, J., McMorrow, D. F., Perry, R. S.
We report a comprehensive experimental investigation of the magnetic structure of the cycloidal phase in Ca$_3$Ru$_2$O$_7$, which mediates the spin reorientation transition, and establishes its magnetic phase diagram. In zero applied field, single-cr
Externí odkaz:
http://arxiv.org/abs/2208.09368
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
Structural behaviour of PbMn$_{7}$O$_{12}$ has been studied by high resolution synchrotron X-ray powder diffraction. This material belongs to a family of quadruple perovskite manganites that exhibit an incommensurate structural modulation associated
Externí odkaz:
http://arxiv.org/abs/2104.06028