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inelastic neutron scattering spectra of quantum magnets

Prof Radu Coldea

Professor of Physics

Research theme

  • Quantum materials

Sub department

  • Condensed Matter Physics

Research groups

  • Quantum magnetism and quantum phase transitions
Radu.Coldea@physics.ox.ac.uk
Telephone: 01865 (2)72335
Clarendon Laboratory, room 111.1
  • About
  • Publications

From incommensurate to dispersive spin-fluctuations: The high-energy inelastic spectrum in superconducting YBa2Cu3O6.5

(2004)

Authors:

C Stock, WJL Buyers, RA Cowley, PS Clegg, R Coldea, CD Frost, R Liang, D Peets, D Bonn, WN Hardy, RJ Birgeneau
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Deviations from linear spin wave theory in the 2D, S = 1/2 Heisenberg antiferromagnet CFTD

Journal of Magnetism and Magnetic Materials 272-276 (2004) 896-897

Authors:

NB Christensen, DF McMorrow, HM Rønnow, A Harrison, TG Perring, R Coldea

Abstract:

The spin excitation spectrum in the 2D square lattice Heisenberg antiferromagnet CFTD has been investigated using time-of-flight neutron scattering. The magnon dispersion and intensities have been determined as a function of wavevector Q in the full Brillouin zone. Both quantities are found to deviate significantly from the predictions of linear spin wave theory for wavevectors in the vicinity of Q=(π,0), whereas good agreement is found near Q=(π/2,π/2). © 2004 Published by Elsevier B.V.
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Field-induced quantum phase transition in the quasi 1D XY-like antiferromagnet Cs2CoCl4

Journal of Magnetism and Magnetic Materials 272-276 (2004) 920-921

Authors:

CJ Mukherjee, R Coldea, DA Tennant, M Koza, M Enderle, K Habicht, P Smeibidl, Z Tylczynski

Abstract:

We explore the magnetic excitations as a function of applied field in the quasi 1D s=12 XY-like magnet Cs2CoCl4. A transition from spin-flop antiferromagnetic order to a quantum paramagnet occurs at the critical field BC=2.15 T and fields higher than 2.5 T fully align the spins along the field. In the spin-flop phase gapped scattering continua dominate, identified with the creation of pairs of quantum domain walls. In the saturated phase sharp peaks are observed, as expected for magnons in a ferromagnetically ordered ground state. © 2003 Elsevier B.V. All rights reserved.
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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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Details from ArXiV

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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