The Kasteleyn transition in three dimensions: spin ice in a [100] field (2009)
Jaubert, Ludovic D. C., Chalker, J. T., Holdsworth, P. C. W., Moessner, R.
We discuss the nearest neighbour spin ice model in the presence of a magnetic field placed along the cubic [100] direction. As recently shown in Phys. Rev. Lett. 100, 067207, 2008, the symmetry...
The Kasteleyn transition in three dimensions: spin ice in a [100] field (2009)
Jaubert, Ludovic D.C., Chalker, J. T., Holdsworth, P. C. W., Moessner, R.
We discuss the nearest neighbour spin ice model in the presence of a magnetic field placed along the cubic [100] direction. As recently shown in Phys. Rev. Lett. 100, 067207, 2008, the symmetry...
The Kasteleyn transition in three dimensions: spin ice in a [100] field (2009)
Jaubert, Ludovic D.C., Chalker, J. T., Holdsworth, P. C. W., Moessner, R.
We discuss the nearest neighbour spin ice model in the presence of a magnetic field placed along the cubic [100] direction. As recently shown in Phys. Rev. Lett. 100, 067207, 2008, the symmetry...
Delannoy, J. -Y. P., Gingras, M. J. P., Holdsworth, P. C. W., Tremblay, A. -M. S.
Spin-only descriptions of the half-filled one-band Hubbard model are relevant for a wide range of Mott insulators. In addition to the usual Heisenberg exchange, many new types of interactions,...
Delannoy, J. -Y. P., Del Maestro, A. G., Gingras, M. J. P., Holdsworth, P. C. W.
We study the ground state quantum spin fluctuations around the N\'eel ordered state for the one-band ($t,U$) Hubbard model on a site-diluted square lattice. An effective spin Hamiltonian, $H_{\rm...
Delannoy, J.-Y. P., Gingras, M. J. P., Holdsworth, P. C. W., Tremblay, A.-M. S.
Spin-only descriptions of the half-filled one-band Hubbard model are relevant for a wide range of Mott insulators. In addition to the usual Heisenberg exchange, many new types of interactions,...
Delannoy, J.-Y. P., Gingras, M. J. P., Holdsworth, P. C. W., Tremblay, A.-M. S.
Spin-only descriptions of the half-filled one-band Hubbard model are relevant for a wide range of Mott insulators. In addition to the usual Heisenberg exchange, many new types of interactions,...
Three-dimensional kasteleyn transition: Spin ice in a [100] field (2008)
Jaubert, L. D. C., Chalker, J. T., Holdsworth, P. C. W., Moessner, R.
Competition Between Exchange and Anisotropy in a Pyrochlore Ferromagnet (2007)
Champion, J. D. M., Bramwell, S. T., Holdsworth, P. C. W., Harris, M. J.
The Ising-like spin ice model, with a macroscopically degenerate ground state, has been shown to be approximated by several real materials. Here we investigate a model related to spin ice, in which...
Portelli, B., Holdsworth, P. C. W.
We address the experimentally observed non-Gaussian fluctuations for the energy injected into a closed turbulent flow at fixed Reynolds number. We propose that the power fluctuations mirror the...
Relevance of soft modes for order parameter fluctuations in the Two-Dimensional XY model (2007)
Portelli, B., Holdsworth, P. C. W.
We analyse the spin wave approximation for the 2D-XY model, directly in reciprocal space. In this limit the model is diagonal and the normal modes are statistically independent. Despite this...
Universal Magnetic Fluctuations with a Field Induced Length Scale (2007)
Portelli, B., Holdsworth, P. C. W., Sellitto, M., Bramwell, S. T.
We calculate the probability density function for the order parameter fluctuations in the low temperature phase of the 2D-XY model of magnetism near the line of critical points. A finite correlation...
Honecker, A., Cabra, D. C., Grynberg, M. D., Holdsworth, P. C. W., Pujol, P., Richter, J., ...
We study the ground state and low-lying excitations of the S=1/2 XXZ antiferromagnet on the kagome lattice at magnetization one third of the saturation. An exponential number of non-magnetic states...
Neel order, ring exchange and charge fluctuations in the half-filled Hubbard model (2004)
Delannoy, J. -Y. P., Gingras, M. J. P., Holdsworth, P. C. W., Tremblay, A. -M. S.
We investigate the ground state properties of the two dimensional half-filled one band Hubbard model in the strong (large-U) to intermediate coupling limit ({\it i.e.} away from the strict Heisenberg...
Cabra, D. C., Grynberg, M. D., Holdsworth, P. C. W., Honecker, A., Pujol, P., Richter, J., ...
We study the ground state properties of a quantum antiferromagnet on the kagome lattice in the presence of a magnetic field, paying particular attention to the stability of the plateau at...
Soft modes in the easy plane pyrochlore antiferromagnet (2003)
Champion, J D M, Holdsworth, P C W
Thermal fluctuations lift the high ground state degeneracy of the classical nearest neighbour pyrochlore antiferromagnet, with easy plane anisotropy, giving a first order phase transition to a long...
Statistics of extremal intensities for Gaussian interfaces (2003)
Gyorgyi, G., Holdsworth, P. C. W., Portelli, B., Racz, Z.
The extremal Fourier intensities are studied for stationary Edwards-Wilkinson-type, Gaussian, interfaces with power-law dispersion. We calculate the probability distribution of the maximal intensity...
Er2Ti2O7: Evidence of quantum order by disorder in a frustrated antiferromagnet (2003)
Champion, J D M, Harris, M J, Holdsworth, P C W, Wills, A S, Balakrishnan, G, Bramwell, S T, ...
Reply to Comment on " Universal Fluctuations in Correlated Systems" (2002)
Bramwell, S. T., Christensen, K., Holdsworth, P. C. W., Jensen, H. J., Lise, S., ...
Reply to the comment, cond-mat/0209398 by by N.W. Watkins, S.C. Chapman, and G. Rowlands
Portelli, B., Holdsworth, P. C. W.
We address the experimentally observed non-Gaussian fluctuations for the energy injected into a closed turbulent flow at fixed Reynolds number. We propose that the power fluctuations mirror the...
Er2Ti2O7: Evidence of Order by Disorder in a Frustrated Antiferromagnet (2001)
Champion, J. D. M., Harris, M. J., Holdsworth, P. C. W., Wills, A. S., Balakrishnan, G., Bramwell, S. T., ...
Er_2Ti_2O_7 has been suggested to be a realization of the frustrated < 111 > XY pyrochlore lattice antiferromagnet, for which theory predicts fluctuation-induced symmetry breaking in a highly...
Bramwell, S. T., Christensen, K., Holdsworth, P. C. W., Jensen, H. J., Lise, S., ...
We reply to the comment on our published paper `` Universal Fluctuations in Correlated Systems'',Phys. Rev. Lett. Vol; 84, p3744 (2000), by B. Zheng and S. Trimper, cond-mat/0109003. We argue that...
From classical to quantum Kagome antiferromagnet in a magnetic field (2001)
Cabra, D. C., Grynberg, M. D., Holdsworth, P. C. W., Pujol, P.
We study the magnetic properties of the Kagome antiferromagnet going from the classical limit to the deep quantum regime of spin 1/2 systems. In all the cases there are special values for the...
Relevance of soft modes for order parameter fluctuations in the Two-Dimensional XY model (2001)
Portelli, B., Holdsworth, P. C. W.
We analyse the spin wave approximation for the 2D-XY model, directly in reciprocal space. In this limit the model is diagonal and the normal modes are statistically independent. Despite this...
Competition Between Exchange and Anisotropy in a Pyrochlore Ferromagnet (2001)
Champion, J. D. M., Bramwell, S. T., Holdsworth, P. C. W., Harris, M. J.
The Ising-like spin ice model, with a macroscopically degenerate ground state, has been shown to be approximated by several real materials. Here we investigate a model related to spin ice, in which...
Universal Magnetic Fluctuations with a Field Induced Length Scale (2001)
Portelli, B., Holdsworth, P. C. W., Sellitto, M., Bramwell, S. T.
We calculate the probability density function for the order parameter fluctuations in the low temperature phase of the 2D-XY model of magnetism near the line of critical points. A finite correlation...
Bramwell, S. T., Holdsworth, P. C. W., Peysson, S., Portelli, B., ...
We study the probability density function for the fluctuations of the magnetic order parameter in the low temperature phase of the XY model of finite size. In two-dimensions this system is critical...
Frustrated Order by Disorder: the Pyrochlore Antiferromagnet with Bond Disorder (2000)
Bellier-Castella, L., Gingras, M. J. P., Holdsworth, P. C. W., Moessner, R.
The classical Heisenberg antiferromagnet on the pyrochlore lattice is macroscopically and continuously degenerate and the system remains disordered at all temperatures, even in the presence of weak...
Universal Fluctuations in Correlated Systems (1999)
Bramwell, S. T., Christensen, K., Holdsworth, P. C. W., Jensen, H. J., Lise, S., ...
The probability density function (PDF) of a global measure in a large class of highly correlated systems has been suggested to be of the same functional form. Here, we identify the analytical form of...
Liquid-gas critical behaviour in a frustrated pyrochlore ferromagnet (1998)
Harris, M J, Bramwell, S T, Holdsworth, P C W, Champion, J D M
Shender, E. F., Cherepanov, V. B., Holdsworth, P. C. W., Berlinsky, A. J.
It is shown that site disorder induces noncoplanar states, competing with the thermal selection of coplanar states, in the nearest neighbor, classical kagome Heisenberg antiferromagnet (AFM). For...