Quantum magnetism and quantum phase transitions

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Ferromagnetic in-plane spin fluctuations in NaxCoO2 observed by neutron inelastic scattering

Physical Review Letters 92 (2004) article 197201 4pp

Authors:

AT Boothroyd, D A Tennant, D Prabhakaran, R Coldea
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27aXL-1 S=1/2擬2次元三角格子反強磁性体Cs_2CuBr_4の磁場中相転移(量子スピン系,ランダム系 : 二次元系)(領域3)

(2004) 429

Authors:

小野 俊雄, 田中 秀数, 大沢 明, 加倉井 和久, 三田村 裕之, O Kolomiets, 後藤 恒昭, R Coldea, DA Tennant, K Habicht, P Smeibidle, M Meissner
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Neutron scattering from deconfined spinons in the 2D frustrated quantum magnet Cs2CuCl4

Journal of Magnetism and Magnetic Materials 272-276:SUPPL. 1 (2004) e649-e650

Authors:

R Coldea, DA Tennant, Z Tylczynski

Abstract:

High-resolution inelastic neutron scattering is used to explore the magnetic excitations in Cs2CuCl4, a quasi-2D spin-5 frustrated Heisenberg antiferromagnet on an anisotropic triangular lattice. In the spin liquid phase above the 3D ordering transition a broad continuum of excited states is observed, characteristic of excitations of pairs of spin-1/2 spinons of a resonating-valence-bond state. In the ordered phase stabilized at low temperatures by the weak inter-layer couplings a sharp spin-wave mode emerges below the continuum lower boundary. © 2004 Published by Elsevier B.V.
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Ferromagnetic in-plane spin fluctuations in NaxCoO2 observed by neutron inelastic scattering

(2003)

Authors:

AT Boothroyd, R Coldea, DA Tennant, D Prabhakaran, LM Helme, CD Frost
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Magnetic Studies of Polycrystalline and Single-Crystal NaxCoO2

ArXiv cond-mat/0312493 (2003)

Authors:

D Prabhakaran, AT Boothroyd, R Coldea, LM Helme, DA Tennant

Abstract:

We have investigated the preparation and bulk magnetic properties of NaxCoO2 in the range 0.5
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