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17 results on '"Bewley, R."'

1. Topological magnon band structure of emergent Landau levels in a skyrmion lattice

Author

Weber, T., Fobes, D. M., Waizner, J., Steffens, P., Tucker, G. S., Bohm, M., Beddrich, L., Franz, C., Gabold, H., Bewley, R., Voneshen, D., Skoulatos, M., Georgii, R., Ehlers, G., Bauer, A., Pfleiderer, C., Boeni, P., Janoschek, M., Garst, M., Weber, T., Fobes, D. M., Waizner, J., Steffens, P., Tucker, G. S., Bohm, M., Beddrich, L., Franz, C., Gabold, H., Bewley, R., Voneshen, D., Skoulatos, M., Georgii, R., Ehlers, G., Bauer, A., Pfleiderer, C., Boeni, P., Janoschek, M., and Garst, M.

Abstract

The motion of a spin excitation across topologically nontrivial magnetic order exhibits a deflection that is analogous to the effect of the Lorentz force on an electrically charged particle in an orbital magnetic field. We used polarized inelastic neutron scattering to investigate the propagation of magnons (i.e., bosonic collective spin excitations) in a lattice of skyrmion tubes in manganese silicide. For wave vectors perpendicular to the skyrmion tubes, the magnon spectra are consistent with the formation of finely spaced emergent Landau levels that are characteristic of the fictitious magnetic field used to account for the nontrivial topological winding of the skyrmion lattice. This provides evidence of a topological magnon band structure in reciprocal space, which is borne out of the nontrivial real-space topology of a magnetic order.

Published
2022

2. Neutron scattering studies on spin fluctuations in Sr2RuO4

Author

Jenni, K., Kunkemoeller, S., Steffens, P., Sidis, Y., Bewley, R., Mao, Z. Q., Maeno, Y., Braden, M., Jenni, K., Kunkemoeller, S., Steffens, P., Sidis, Y., Bewley, R., Mao, Z. Q., Maeno, Y., and Braden, M.

Abstract

The magnetic excitations in Sr2RuO4 are studied by polarized and unpolarized neutron scattering experiments as a function of temperature. At the scattering vector of the Fermi-surface nesting with a half-integer out-of-plane component, there is no evidence for the appearance of a resonance excitation in the superconducting phase. The body of existing data indicates weakening of the scattered intensity in the nesting spectrum to occur at very low energies. The nesting signal persists up to 290 K but is strongly reduced. In contrast, a quasiferromagnetic contribution maintains its strength and still exhibits a finite width in momentum space.

Published
2021

3. Neutron scattering studies on spin fluctuations in Sr2RuO4

Author

Jenni, K., Kunkemoeller, S., Steffens, P., Sidis, Y., Bewley, R., Mao, Z. Q., Maeno, Y., Braden, M., Jenni, K., Kunkemoeller, S., Steffens, P., Sidis, Y., Bewley, R., Mao, Z. Q., Maeno, Y., and Braden, M.

Abstract

The magnetic excitations in Sr2RuO4 are studied by polarized and unpolarized neutron scattering experiments as a function of temperature. At the scattering vector of the Fermi-surface nesting with a half-integer out-of-plane component, there is no evidence for the appearance of a resonance excitation in the superconducting phase. The body of existing data indicates weakening of the scattered intensity in the nesting spectrum to occur at very low energies. The nesting signal persists up to 290 K but is strongly reduced. In contrast, a quasiferromagnetic contribution maintains its strength and still exhibits a finite width in momentum space.

Published
2021

4. Topological Magnon Bands in a Kagome Lattice Ferromagnet

Author

Massachusetts Institute of Technology. Department of Chemistry, Massachusetts Institute of Technology. Department of Physics, Chisnell, Robin, Freedman, Danna, Nocera, Daniel G., Lee, Young S., Helton, J. S., Singh, D. K., Bewley, R. I., Massachusetts Institute of Technology. Department of Chemistry, Massachusetts Institute of Technology. Department of Physics, Chisnell, Robin, Freedman, Danna, Nocera, Daniel G., Lee, Young S., Helton, J. S., Singh, D. K., and Bewley, R. I.

Abstract

There is great interest in finding materials possessing quasiparticles with topological properties. Such materials may have novel excitations that exist on their boundaries which are protected against disorder. We report experimental evidence that magnons in an insulating kagome ferromagnet can have a topological band structure. Our neutron scattering measurements further reveal that one of the bands is flat due to the unique geometry of the kagome lattice. Spin wave calculations show that the measured band structure follows from a simple Heisenberg Hamiltonian with a Dzyaloshinkii-Moriya interaction. This serves as the first realization of an effectively two-dimensional topological magnon insulator—a new class of magnetic material that should display both a magnon Hall effect and protected chiral edge modes., United States. Dept. of Energy. Office of Basic Energy Sciences (Grant DE-FG02-07ER46134), National Science Foundation (U.S.) (Grant CHE 1041863)

Published
2015

6. Evidence for SrHo2O4 and SrDy2O4 as model J1-J2 zigzag chain materials

Author

Fennell, A., Pomjakushin, V. Y., Uldry, A., Delley, B., Prévost, B., Désilets-Benoit, A., Bianchi, A. D., Bewley, R. I., Hansen, B. R., Klimczuk, T., Cava, Robert J., Kenzelmann, M., Fennell, A., Pomjakushin, V. Y., Uldry, A., Delley, B., Prévost, B., Désilets-Benoit, A., Bianchi, A. D., Bewley, R. I., Hansen, B. R., Klimczuk, T., Cava, Robert J., and Kenzelmann, M.

Abstract

Neutron diffraction and inelastic spectroscopy is used to characterize the magnetic Hamiltonian of SrHo2O4 and SrDy2O4. Through a detailed computation of the crystal-field levels we find site-dependent anisotropic single-ion magnetism in both materials, and diffraction measurements show the presence of strong one-dimensional spin correlations. Our measurements indicate that competing interactions of the zigzag chain, combined with frustrated interchain interactions, play a crucial role in stabilizing spin-liquid type correlations in this series.

Published
2014

10. New sources and instrumentation for neutrons in biology

Author

Teixeira, S. C. M., Zaccai, G., Ankner, J., Bellissent-Funel, M. C., Bewley, R., Blakeley, M. P., Callow, P., Coates, L., Dahint, R., Dalgliesh, R., Dencher, N. A., Forsyth, V. T., Fragneto, G., Frick, B., Gilles, R., Gutberlet, T., Haertlein, M., Hauss, T., Haeussler, W., Heller, W. T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R. E., Lynn, G., Majkrzak, C., May, R. P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D. A. A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Ruehm, A., Schwahn, D., Shibata, K., Soper, A. K., Straessle, Th., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., Weiss, K., Teixeira, S. C. M., Zaccai, G., Ankner, J., Bellissent-Funel, M. C., Bewley, R., Blakeley, M. P., Callow, P., Coates, L., Dahint, R., Dalgliesh, R., Dencher, N. A., Forsyth, V. T., Fragneto, G., Frick, B., Gilles, R., Gutberlet, T., Haertlein, M., Hauss, T., Haeussler, W., Heller, W. T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R. E., Lynn, G., Majkrzak, C., May, R. P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D. A. A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Ruehm, A., Schwahn, D., Shibata, K., Soper, A. K., Straessle, Th., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., and Weiss, K.

Published
2008

11. New sources and instrumentation for neutrons in biology

Author

Teixeira, S. C. M., Zaccai, G., Ankner, J., Bellissent-Funel, M. C., Bewley, R., Blakeley, M. P., Callow, P., Coates, L., Dahint, R., Dalgliesh, R., Dencher, N. A., Forsyth, V. T., Fragneto, G., Frick, B., Gilles, R., Gutberlet, T., Haertlein, M., Hauss, T., Haeussler, W., Heller, W. T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R. E., Lynn, G., Majkrzak, C., May, R. P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D. A. A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Ruehm, A., Schwahn, D., Shibata, K., Soper, A. K., Straessle, Th., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., Weiss, K., Teixeira, S. C. M., Zaccai, G., Ankner, J., Bellissent-Funel, M. C., Bewley, R., Blakeley, M. P., Callow, P., Coates, L., Dahint, R., Dalgliesh, R., Dencher, N. A., Forsyth, V. T., Fragneto, G., Frick, B., Gilles, R., Gutberlet, T., Haertlein, M., Hauss, T., Haeussler, W., Heller, W. T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R. E., Lynn, G., Majkrzak, C., May, R. P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D. A. A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Ruehm, A., Schwahn, D., Shibata, K., Soper, A. K., Straessle, Th., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., and Weiss, K.

Published
2008

12. New sources and instrumentation for neutrons in biology (vol 345, pg 133, 2008)

Author

Teixeira, S. C. M., Zaccai, G., Ankner, J., Bellissent-Funel, M. C., Bewley, R., Blakeley, M. P., Callow, P., Coates, L., Dahint, R., Dalgliesh, R., Dencher, N. A., Forsyth, V. T., Fragneto, G., Frick, B., Gilles, R., Gutberlet, T., Haertlein, M., Hauss, T., Haeussler, W., Heller, W. T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R. E., Lynn, G., Majkrzak, C., May, R. P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D. A. A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Ruehm, A., Schwahn, D., Shibata, K., Soper, A. K., Straessle, Th., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., Weiss, K., Teixeira, S. C. M., Zaccai, G., Ankner, J., Bellissent-Funel, M. C., Bewley, R., Blakeley, M. P., Callow, P., Coates, L., Dahint, R., Dalgliesh, R., Dencher, N. A., Forsyth, V. T., Fragneto, G., Frick, B., Gilles, R., Gutberlet, T., Haertlein, M., Hauss, T., Haeussler, W., Heller, W. T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R. E., Lynn, G., Majkrzak, C., May, R. P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D. A. A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Ruehm, A., Schwahn, D., Shibata, K., Soper, A. K., Straessle, Th., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., and Weiss, K.

Published
2008

13. New sources and instrumentation for neutrons in biology (vol 345, pg 133, 2008)

Author

Teixeira, S. C. M., Zaccai, G., Ankner, J., Bellissent-Funel, M. C., Bewley, R., Blakeley, M. P., Callow, P., Coates, L., Dahint, R., Dalgliesh, R., Dencher, N. A., Forsyth, V. T., Fragneto, G., Frick, B., Gilles, R., Gutberlet, T., Haertlein, M., Hauss, T., Haeussler, W., Heller, W. T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R. E., Lynn, G., Majkrzak, C., May, R. P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D. A. A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Ruehm, A., Schwahn, D., Shibata, K., Soper, A. K., Straessle, Th., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., Weiss, K., Teixeira, S. C. M., Zaccai, G., Ankner, J., Bellissent-Funel, M. C., Bewley, R., Blakeley, M. P., Callow, P., Coates, L., Dahint, R., Dalgliesh, R., Dencher, N. A., Forsyth, V. T., Fragneto, G., Frick, B., Gilles, R., Gutberlet, T., Haertlein, M., Hauss, T., Haeussler, W., Heller, W. T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R. E., Lynn, G., Majkrzak, C., May, R. P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D. A. A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Ruehm, A., Schwahn, D., Shibata, K., Soper, A. K., Straessle, Th., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., and Weiss, K.

Published
2008

14. New sources and instrumentation for neutrons in biology

Author

Teixeira, S.C.M., Zaccai, G., Ankner, J., Bellissent-Funel, M.C., Bewley, R., Blakeley, M.P., Callow, P., Coates, L., Dahint, R., Dalgleish, R., Dencher, N.A., Forsyth, V.T., Fragneto, G., Frick, B., Gilles, R., Gurburlet, T., Haertlein, M., Hauss, T., Häußler, W., Heller, W.T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R.E., Lynn, G., Majkrzak, C., May, R.P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D.A.A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Rühm, A., Schwahn, D., Shibata, K., Soper, A.K., Strässle, T., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., Weiss, K., Teixeira, S.C.M., Zaccai, G., Ankner, J., Bellissent-Funel, M.C., Bewley, R., Blakeley, M.P., Callow, P., Coates, L., Dahint, R., Dalgleish, R., Dencher, N.A., Forsyth, V.T., Fragneto, G., Frick, B., Gilles, R., Gurburlet, T., Haertlein, M., Hauss, T., Häußler, W., Heller, W.T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R.E., Lynn, G., Majkrzak, C., May, R.P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D.A.A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Rühm, A., Schwahn, D., Shibata, K., Soper, A.K., Strässle, T., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., and Weiss, K.

Abstract

Neutron radiation offers significant advantages for the study of biological molecular structure and dynamics. A broad and significant effort towards instrumental and methodological development to facilitate biology experiments at neutron sources worldwide is reviewed., Neutron radiation offers significant advantages for the study of biological molecular structure and dynamics. A broad and significant effort towards instrumental and methodological development to facilitate biology experiments at neutron sources worldwide is reviewed.

Published
2008

15. New sources and instrumentation for neutrons in biology

Author

Teixeira, S.C.M., Zaccai, G., Ankner, J., Bellissent-Funel, M.C., Bewley, R., Blakeley, M.P., Callow, P., Coates, L., Dahint, R., Dalgleish, R., Dencher, N.A., Forsyth, V.T., Fragneto, G., Frick, B., Gilles, R., Gurburlet, T., Haertlein, M., Hauss, T., Häußler, W., Heller, W.T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R.E., Lynn, G., Majkrzak, C., May, R.P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D.A.A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Rühm, A., Schwahn, D., Shibata, K., Soper, A.K., Strässle, T., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., Weiss, K., Teixeira, S.C.M., Zaccai, G., Ankner, J., Bellissent-Funel, M.C., Bewley, R., Blakeley, M.P., Callow, P., Coates, L., Dahint, R., Dalgleish, R., Dencher, N.A., Forsyth, V.T., Fragneto, G., Frick, B., Gilles, R., Gurburlet, T., Haertlein, M., Hauss, T., Häußler, W., Heller, W.T., Herwig, K., Holderer, O., Juranyi, F., Kampmann, R., Knott, R., Krueger, S., Langan, P., Lechner, R.E., Lynn, G., Majkrzak, C., May, R.P., Meilleur, F., Mo, Y., Mortensen, Kell, Myles, D.A.A., Natali, F., Neylon, C., Niimura, N., Ollivier, J., Ostermann, A., Peters, J., Pieper, J., Rühm, A., Schwahn, D., Shibata, K., Soper, A.K., Strässle, T., Suzuki, J., Tanaka, I., Tehei, M., Timmins, P., Torikai, N., Unruh, T., Urban, V., Vavrin, R., and Weiss, K.

Abstract

Neutron radiation offers significant advantages for the study of biological molecular structure and dynamics. A broad and significant effort towards instrumental and methodological development to facilitate biology experiments at neutron sources worldwide is reviewed., Neutron radiation offers significant advantages for the study of biological molecular structure and dynamics. A broad and significant effort towards instrumental and methodological development to facilitate biology experiments at neutron sources worldwide is reviewed.

Published
2008

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