Zobrazeno 1 - 10
of 263
pro vyhledávání: '"Copley, J. P."'
Autor:
Tourret, D., Klemm-Toole, J., Castellanos, A. Eres, Rodgers, B., Becker, G., Saville, A., Ellyson, B., Johnson, C., Milligan, B., Copley, J., Ochoa, R., Polonsky, A., Pusch, K., Haines, M. P., Fezzaa, K., Sun, T., Clarke, K., Babu, S., Pollock, T., Karma, A., Clarke, A.
Publikováno v:
Acta Materialia 250 (2023) 118858
Understanding rapid solidification behavior at velocities relevant to additive manufacturing (AM) is critical to controlling microstructure selection. Although in-situ visualization of solidification dynamics is now possible, systematic studies under
Externí odkaz:
http://arxiv.org/abs/2303.09137
Autor:
Matsuda, M., Dissanayake, S. E., Abernathy, D. L., Qiu, Y., Copley, J. R. D., Kumada, N., Azuma, M.
Inelastic neutron scattering study has been performed in an S=3/2 bilayer honeycomb lattice compound Bi3Mn4O12(NO3) at ambient and high magnetic fields. Relatively broad and monotonically dispersive magnetic excitations were observed at ambient field
Externí odkaz:
http://arxiv.org/abs/1910.03816
Autor:
Gannon, W. J., Zaliznyak, I. A., Wu, L. S., Feiguin, A. E., Tsvelik, A. M., Demmel, F., Qiu, Y., Copley, J. R. D., Kim, M. S., Aronson, M. C.
Publikováno v:
Nature Communications 10, 1123 (2019)
The fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined in pairs, form a triplet excitation continuum. In an Ising-like spin chain the continuum is gapped and the gr
Externí odkaz:
http://arxiv.org/abs/1907.01067
Autor:
Wen, J. -J., Koohpayeh, S. M., Ross, K. A., Trump, B. A., McQueen, T. M., Kimura, K., Nakatsuji, S., Qiu, Y., Pajerowski, D. M., Copley, J. R. D., Broholm, C. L.
Publikováno v:
Phys. Rev. Lett. 118, 107206 (2017)
Inelastic neutron scattering reveals a broad continuum of excitations in Pr$_2$Zr$_2$O$_7$, the temperature and magnetic field dependence of which indicate a continuous distribution of quenched transverse fields ($\Delta$) acting on the non-Kramers P
Externí odkaz:
http://arxiv.org/abs/1609.08551
Autor:
Wu, L. S., Gannon, W. J., Zaliznyak, I. A., Tsvelik, A. M., Brockmann, M., Caux, J. -S., Kim, M. S., Qiu, Y., Copley, J. R. D., Ehlers, G., Podlesnyak, A., Aronson, M. C.
Publikováno v:
Science 352, 1206-1210 (2016)
Exotic quantum states and fractionalized magnetic excitations, such as spinons in one-dimensional chains, are generally viewed as belonging to the domain of 3d transition metal systems with spins 1/2. Our neutron scattering experiments on the 4f-elec
Externí odkaz:
http://arxiv.org/abs/1606.01309
Autor:
Kermarrec, E., Maharaj, D. D., Gaudet, J., Fritsch, K., Pomaranski, D., Kycia, J. B., Qiu, Y., Copley, J. R. D., Couchman, M., Morningstar, A., Dabkowska, H. A., Gaulin, B. D.
Publikováno v:
Phys. Rev. B 92, 245114 (2015)
Recent low temperature heat capacity (C$_P$) measurements on polycrystalline samples of the pyrochlore antiferromagnet Tb$_{2+x}$Ti$_{2-x}$O$_{7+\delta}$ have shown a strong sensitivity to the precise Tb concentration $x$, with a large anomaly exhibi
Externí odkaz:
http://arxiv.org/abs/1511.00733
Autor:
Chen, T., Foley, B. J., Ipek, B., Tyagi, M., Copley, J. R. D., Brown, C. M., Choi, J. J., Lee, S. -H.
Methylammonium lead iodide (CH3NH3PbI3) based solar cells have shown impressive power conversion efficiencies of above 20%. However, the microscopic mechanism of the high photovoltaic performance is yet to be fully understood. Particularly, the dynam
Externí odkaz:
http://arxiv.org/abs/1506.02205
Autor:
Miiller, W., Wu, L. S., Kim, M. S., Orvis, T., Simonson, J. W., Gamaza, M., McNally, D. E., Nelson, C. S., Ehlers, G., Podlesnyak, A., Helton, J. S., Zhao, Y., Qiu, Y., Copley, J. R. D., Lynn, J. W., Zaliznyak, I., Aronson, M. C.
Publikováno v:
Phys. Rev. B 93, 104419 (2016)
Neutron diffraction measurements were carried out on single crystals and powders of Yb2Pt2Pb, where Yb moments form planes of orthogonal dimers in the frustrated Shastry-Sutherland Lattice (SSL). Yb2Pt2Pb orders antiferromagnetically at TN=2.07 K, an
Externí odkaz:
http://arxiv.org/abs/1408.0209
Autor:
Ma, J., Lee, J. H., Hahn, S. E., Hong, Tao, Cao, H. B., Aczel, A. A., Dun, Z. L., Stone, M. B., Tian, W., Qiu, Y., Copley, J. R. D., Zhou, H. D., Fishman, R. S., Matsuda, M.
Publikováno v:
Phys. Rev. B 91, 020407 (R) (2015)
The crossover from localized- to itinerant-electron behavior is associated with many intriguing phenomena in condensed-matter physics. In this paper, we investigate the crossover from localized to itinerant regimes in the spinel system Mn$_{1-x}$Co$_
Externí odkaz:
http://arxiv.org/abs/1407.4143
We examine the magnetic field dependent excitations of the dimerized spin-1/2 chain, copper nitrate, with antiferromagnetic intra-dimer exchange $J_1=0.44$ meV and exchange alternation $\alpha=J_2/J_1=0.24$. Magnetic excitations in three distinct reg
Externí odkaz:
http://arxiv.org/abs/1406.7596