Zobrazeno 1 - 10
of 182
pro vyhledávání: '"Upton, M . H."'
The pyrochlore osmate Ho2Os2O7 is a candidate material for a fragile J=0 local singlet ground state, however little is known regarding the single-ion behavior of either the Os or Ho ions. To address this we present polarized neutron powder diffractio
Externí odkaz:
http://arxiv.org/abs/2312.14811
Autor:
Magnaterra, M., Attig, J., Peterlini, L., Hermanns, M., Upton, M. H., Kim, Jungho, Prodan, L., Tsurkan, V., Kézsmárki, I., van Loosdrecht, P. H. M., Grüninger, M.
Publikováno v:
Phys. Rev. Lett. 133, 046501 (2024)
Quasimolecular orbitals in cluster Mott insulators provide a route to tailor exchange interactions, which may yield novel quantum phases of matter. We demonstrate the cluster Mott character of the lacunar spinel GaTa$_4$Se$_8$ using resonant inelasti
Externí odkaz:
http://arxiv.org/abs/2309.12454
Autor:
Hepting, M., Boyko, T. D., Zimmermann, V., Bejas, M., Suyolcu, Y. E., Puphal, P., Green, R. J., Zinni, L., Kim, J., Casa, D., Upton, M. H., Wong, D., Schulz, C., Bartkowiak, M., Habicht, K., Pomjakushina, E., Cristiani, G., Logvenov, G., Minola, M., Yamase, H., Greco, A., Keimer, B.
Publikováno v:
Phys. Rev. B 107, 214516 (2023)
We use resonant inelastic x-ray scattering (RIXS) at the O $K$- and Cu $K$-edges to investigate the doping- and temperature dependence of low-energy plasmon excitations in La$_{2-x}$Sr$_{x}$CuO$_4$. We observe a monotonic increase of the energy scale
Externí odkaz:
http://arxiv.org/abs/2306.15650
Autor:
de la Torre, A., Zager, B., Bahrami, F., Upton, M. H., Kim, J., Fabbris, G., Lee, G. -H., Yang, W., Haskel, D., Tafti, F., Plumb, K. W.
Publikováno v:
Nature Communications 14, 5018 (2023)
In the search for realizations of Quantum Spin Liquids (QSL), it is essential to understand the interplay between inherent disorder and the correlated fluctuating spin ground state. H$_3$LiIr$_2$O$_6$ is regarded as a spin liquid proximate to the Kit
Externí odkaz:
http://arxiv.org/abs/2302.07907
Autor:
Magnaterra, M., Hopfer, K., Sahle, Ch. J., Sala, M. Moretti, Monaco, G., Attig, J., Hickey, C., Pietsch, I. -M., Breitner, F., Gegenwart, P., Upton, M. H., Kim, Jungho, Trebst, S., van Loosdrecht, P. H. M., Brink, J. van den, Grüninger, M.
Spin-orbit coupling locks spin direction and spatial orientation and generates, in semi-classical magnets, a local spin easy-axis and associated ordering. Quantum spin-1/2's defy this fate: rather than spins becoming locally anisotropic, the spin-spi
Externí odkaz:
http://arxiv.org/abs/2301.08340
Autor:
de la Torre, A., Zager, B., Chamorro, J. R., Upton, M. H., Fabbris, G., Haskel, D., Casa, D., McQueen, T. M., Plumb, K. W.
We investigate the electronic structure of two Ir$^{5+}$ honeycomb iridates, Sr$_3$CaIr$_2$O$_9$ and NaIrO$_3$, by means of resonant x-ray techniques. We confirm that Sr$_3$CaIr$_2$O$_9$ realizes a large spin-orbit driven non-magnetic $J = 0$ singlet
Externí odkaz:
http://arxiv.org/abs/2206.11310
Autor:
Aczel, A. A., Chen, Q., Clancy, J. P., Cruz, C. dela, Reig-i-Plessis, D., MacDougall, G. J., Pollock, C. J., Upton, M. H., Williams, T. J., LaManna, N., Carlo, J. P., Beare, J., Luke, G. M., Zhou, H. D.
Iridates with the 5$d^4$ electronic configuration have attracted recent interest due to reports of magnetically-ordered ground states despite longstanding expectations that their strong spin-orbit coupling would generate a $J = 0$ electronic ground s
Externí odkaz:
http://arxiv.org/abs/2204.05384
Autor:
Clancy, J. P., Gretarsson, H., Lupascu, A., Sears, J. A., Nie, Z., Upton, M. H., Kim, Jungho, Islam, Z., Uchida, M., Schlom, D. G., Shen, K. M., Kim, Young-June
We report a resonant inelastic x-ray scattering (RIXS) investigation of ultra-thin epitaxial films of Ba$_2$IrO$_4$, and compare their low energy magnetic and spin-orbit excitations to those of their sister compound Sr$_2$IrO$_4$. Due to the 180$^\ci
Externí odkaz:
http://arxiv.org/abs/2203.13102
Autor:
Mazzone, D. G., Shen, Y., Suwa, H., Fabbris, G., Yang, J., Zhang, S-S., Miao, H., Sears, J., Jia, Ke, Shi, Y. G., Upton, M. H., Casa, D. M., Liu, X., Liu, J., Batista, C. D., Dean, M. P. M.
Publikováno v:
Nature Communications volume 13, Article number: 913 (2022)
Excitonic insulators are usually considered to form via the condensation of a soft charge mode of bound electron-hole pairs. This, however, presumes that the soft exciton is of spin-singlet character. Early theoretical considerations have also predic
Externí odkaz:
http://arxiv.org/abs/2201.04030
Autor:
Shen, Y., Sears, J., Fabbris, G., Weichselbaum, A., Yin, W., Zhao, H., Mazzone, D. G., Miao, H., Upton, M . H., Casa, D., Acevedo-Esteves, R., Nelson, C., Barbour, A. M., Mazzoli, C., Cao, G., Dean, M. P. M.
Spinons are well-known as the elementary excitations of one-dimensional antiferromagnetic chains, but means to realize spinons in higher dimensions is the subject of intense research. Here, we use resonant x-ray scattering to study the layered trimer
Externí odkaz:
http://arxiv.org/abs/2201.02567