Zobrazeno 1 - 10
of 2 264
pro vyhledávání: '"Kawashima N"'
Autor:
Okuma, R., Nakamura, D., Okubo, T., Miyake, A., Matsuo, A., Kindo, K., Tokunaga, M., Kawashima, N., Takeyama, S., Hiroi, Z.
Publikováno v:
Nature Communications 10, 1229 (2019)
Search for a new quantum state of matter emerging in a crystal is one of recent trends in condensed matter physics. For magnetic materials, geometrical frustration and high magnetic field are two key ingredients to realize it: a conventional magnetic
Externí odkaz:
http://arxiv.org/abs/1903.07283
Publikováno v:
Phys. Rev. B 84, 214429 (2011)
We present results of our Monte Carlo simulation of the Ising-O(3) model on the two-dimensional (2D) and quasi-2D lattices. This model is an effective classical model for the stacked square-lattice $J_1$-$J_2$ Heisenberg model where the nearest neigh
Externí odkaz:
http://arxiv.org/abs/1108.1599
Publikováno v:
Phys. Rev. B 84, 054302 (2011)
We use quantum Monte Carlo (QMC) simulations to study the combined effects of harmonic confinement and temperature for bosons in a two dimensional optical lattice. The scale invariant, finite temperature, state diagram is presented for the Bose-Hubba
Externí odkaz:
http://arxiv.org/abs/1101.5726
We study the finite-temperature transition to the $m=1/2$ magnetization plateau in a model of interacting $S=1/2$ spins with longer range interactions and strong exchange anisotropy on the geometrically frustrated Shastry-Sutherland lattice. This mod
Externí odkaz:
http://arxiv.org/abs/1009.3543
Publikováno v:
Phys. Rev. B 80, 180414(R) (2009)
We study two-dimensional Heisenberg antiferromagnets with additional multi-spin interactions which can drive the system into a valence-bond solid state. For standard SU(2) spins, we consider both four- and six-spin interactions. We find continuous qu
Externí odkaz:
http://arxiv.org/abs/0908.0740
Autor:
Zapf, V. S., Correa, V. F., Sengupta, P., Batista, C. D., Tsukamoto, M., Kawashima, N., Egan, P., Pantea, C., Migliori, A., Betts, J. B., Jaime, M., Paduan-Filho, A.
We report a method for determining the spatial dependence of the magnetic exchange coupling, $dJ/dr$, from magnetostriction measurements of a quantum magnet. The organic Ni $S = 1$ system NiCl$_2$-4SC(NH$_2$)$_2$ exhibits lattice distortions in respo
Externí odkaz:
http://arxiv.org/abs/0705.0365
Autor:
Zvyagin, S. A., Wosnitza, J., Batista, C. D., Tsukamoto, M., Kawashima, N., Krzystek, J., Zapf, V. S., Jaime, M., Oliveira, Jr., N. F., Paduan-Filho, A.
Publikováno v:
Physical Review Letters 98, 047205 (2007)
NiCl$_2$-4SC(NH$_2$)$_2$ (DTN) is a quantum S=1 chain system with strong easy-pane anisotropy and a new candidate for the Bose-Einstein condensation of the spin degrees of freedom. ESR studies of magnetic excitations in DTN in fields up to 25 T are p
Externí odkaz:
http://arxiv.org/abs/cond-mat/0701750
Autor:
Batista, C. D., Schmalian, J., Kawashima, N., Sengupta, P., Sebastian, S. E., Harrison, N., Jaime, M., Fisher, I. R.
We show that the spatial dimensionality of the quantum critical point associated with Bose--Einstein condensation at T=0 is reduced when the underlying lattice comprises a set of layers coupled by a frustrating interaction. Our theoretical prediction
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608703
Autor:
Sebastian, S. E., Harrison, N., Batista, C. D., Balicas, L., Jaime, M., Sharma, P. A., Kawashima, N., Fisher, I. R.
Publikováno v:
Nature Vol. 441, pp 617-620 (2006)
Competition between electronic ground states near a quantum critical point (QCP) - the location of a zero-temperature phase transition driven solely by quantum-mechanical fluctuations - is expected to lead to unconventional behaviour in low-dimension
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606042
Autor:
Sebastian, S. E., Sharma, P. A., Jaime, M., Harrison, N., Correa, V., Balicas, L., Kawashima, N., Batista, C. D., Fisher, I. R.
Publikováno v:
Phys. Rev. B 72, 100404(R) (2005)
We report an experimental determination of the phase boundary between a quantum paramagnetic state and the proposed spin Bose-Einstein condensate of triplons in the spin gap compound BaCuSi2O6. The ordering temperature is related to the proximity to
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502374