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Neutron scattering study of the field-dependent ground state and the spin dynamics in S=1/2 NH4CuCl3.
Physical Review Letters
, Article 037207. 10.1103/PhysRevLett.93.037207.
Elastic and inelastic neutron scattering experiments have been performed on the dimer spin system NH4CuCl3, which shows plateaus in the magnetization curve at m=1/4 and m=3/4 of the saturation value. Two structural phase transitions at T1≈156 K and at T2=70 K lead to a doubling of the crystallographic unit cell along the b direction and as a consequence a segregation into different dimer subsystems. Long-range magnetic ordering is reported below TN=1.3 K. The magnetic field dependence of the excitation spectrum identifies successive quantum phase transitions of the dimer subsystems as the driving mechanism for the unconventional magnetization process in agreement with a recent theoretical model.
|Title:||Neutron scattering study of the field-dependent ground state and the spin dynamics in S=1/2 NH4CuCl3|
|Open access status:||An open access version is available from UCL Discovery|
|Additional information:||© 2004 The American Physical Society|
|Keywords:||quantum phase transition, dimer, insulator, neutron scattering|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
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