Quantum magnetism and quantum phase transitions

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Spin excitations and exchange couplings in the cuprate antiferromagnet La2CuO4

Physica B: Condensed Matter 276-278 (2000) 592-593

Authors:

R Coldea, SM Hayden, G Aeppli, TG Perring, CD Frost, TE Mason, SW Cheong, Z Fisk

Abstract:

The spin excitations in La2CuO4, a two-dimensional spin- 1/2 Heisenberg antiferromagnet and parent compound of high-Tc superconductors, have been measured throughout the Brillouin zone using high-resolution inelastic neutron scattering. The observed dispersion relations show evidence for substantial second- or third-nearest-neighbour exchange couplings in addition to the strong first nearest-neighbour antiferromagnetic exchange.
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Spin resonance studies of the quasi-one-dimensional Heisenberg antiferromagnet Cs2CuCl4

Physica B Condensed Matter Elsevier 256 (1998) 637-640

Authors:

JM Schrama, A Ardavan, AV Semeno, PJ Gee, E Rzepniewski, J Suto, R Coldea, J Singleton, P Goy
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Localized vibrational modes in metallic solids

Nature Springer Nature 395:6705 (1998) 876-878

Authors:

V Keppens, D Mandrus, BC Sales, BC Chakoumakos, P Dai, R Coldea, MB Maple, DA Gajewski, EJ Freeman, S Bennington
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Critical behavior of the three-dimensional Heisenberg antiferromagnet RbMnF3

Physical Review B American Physical Society (APS) 57:9 (1998) 5281-5290

Authors:

R Coldea, RA Cowley, TG Perring, DF McMorrow, B Roessli
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Critical scattering of RbMnF3 revisited

Journal of Magnetism and Magnetic Materials Elsevier 177 (1998) 141-142

Authors:

R Coldea, RA Cowley, TG Perring, DF McMorrow, B Roessli
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