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of 686
pro vyhledávání: '"Singh, R R"'
Autor:
Nian, Y-H., Vinograd, I., Chaffey, C., Li, Y., Zic, M. P., Massat, P., Singh, R. R. P., Fisher, I. R., Curro, N. J.
Publikováno v:
Front. Phys. vol 12 (2024)
The suppression of ferroquadrupolar order in TmVO$_4$ in a magnetic field is well-described by the transverse field Ising model, enabling detailed studies of critical dynamics near the quantum phase transition. We describe nuclear magnetic resonance
Externí odkaz:
http://arxiv.org/abs/2402.18519
Autor:
Nian, Y-H., Vinograd, I., Green, T., Chaffey, C., Massat, P., Singh, R. R. P., Zic, M. P., Fisher, I. R., Curro, N. J.
Publikováno v:
Phys. Rev. Lett. 132, 216502 (2024)
Using spin-echo Nuclear Magnetic Resonance in the model Transverse-Field Ising system TmVO$_4$, we show that low frequency quantum fluctuations at the quantum critical point have a very different effect on $^{51}$V nuclear-spins than classical low-fr
Externí odkaz:
http://arxiv.org/abs/2306.13244
Publikováno v:
Phys. Rev. B 98, 214404 (2018)
We present results on entropy and heat-capacity of the spin-S honeycomb-lattice Kitaev models using high-temperature series expansions and thermal pure quantum (TPQ) state methods. We study models with anisotropic couplings $J_z=1\ge J_x=J_y$ for spi
Externí odkaz:
http://arxiv.org/abs/1809.10112
Autor:
Singh, R. R. P., Young, A. P.
Publikováno v:
Phys. Rev. B 96, 214210 (2017)
We discuss generation of series expansions for Ising spin-glasses with a symmetric $\pm J$ (i.e. bimodal) distribution on d-dimensional hypercubic lattices using linked-cluster methods. Simplifications for the bimodal distribution allow us to go to h
Externí odkaz:
http://arxiv.org/abs/1709.03609
Autor:
Singh, R. R. P., Young, A. P.
Publikováno v:
Phys. Rev. E 96, 022139 (2017)
We study the $\pm J$ transverse-field Ising spin glass model at zero temperature on d-dimensional hypercubic lattices and in the Sherrington-Kirkpatrick (SK) model, by series expansions around the strong field limit. In the SK model and in high-dimen
Externí odkaz:
http://arxiv.org/abs/1707.01557
Autor:
Singh, R. R. P., Young, A. P.
Publikováno v:
Phys. Rev. E 96, 012127 (2017)
We use high temperature series expansions to study the $\pm J$ Ising spin-glass in a magnetic field in $d$-dimensional hypercubic lattices for $d=5, 6, 7$ and $8$, and in the infinite-range Sherrington-Kirkpatrick (SK) model. The expansions are obtai
Externí odkaz:
http://arxiv.org/abs/1705.01164
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Publikováno v:
Phys. Rev. E 96, 042108 (2017)
We explore the phase diagram of Ising spins on one-dimensional chains which criss-cross in two perpendicular directions and which are connected by interchain couplings. This system is of interest as a simpler, classical analog of a quantum Hamiltonia
Externí odkaz:
http://arxiv.org/abs/1608.02974
Autor:
Babkevich, P., Katukuri, Vamshi M., Fåk, B., Rols, S., Fennell, T., Pajić, D., Tanaka, H., Pardini, T., Singh, R. R. P., Mitrushchenkov, A., Yazyev, O. V., Rønnow, H. M.
Publikováno v:
Phys. Rev. Lett. 117, 237203 (2016)
Sr$_2$CuTeO$_6$ presents an opportunity for exploring low-dimensional magnetism on a square lattice of $S=1/2$ Cu$^{2+}$ ions. We employ ab initio multi-reference configuration interaction calculations to unravel the Cu$^{2+}$ electronic structure an
Externí odkaz:
http://arxiv.org/abs/1605.09714
Autor:
Jaubert, L. D. C., Benton, Owen, Rau, Jeffrey G., Oitmaa, J., Singh, R. R. P., Shannon, Nic, Gingras, Michel J. P.
Publikováno v:
Phys. Rev. Lett. 115, 267208 (2015)
If magnetic frustration is most commonly known for undermining long-range order, as famously illustrated by spin liquids, the ability of matter to develop new collective mechanisms in order to fight frustration is no less fascinating, providing an av
Externí odkaz:
http://arxiv.org/abs/1505.05499