Rüegg, C; Oettli, M; Schefer, J; Zaharko, OF; A, T; H, G; H U, K; ... T, M; + view all Rüegg, C; Oettli, M; Schefer, J; Zaharko, OF; A, T; H, G; H U, K; K, V; P, H; K, P; T, M; - view fewer (2004) Neutron scattering study of the field-dependent ground state and the spin dynamics in S=1/2 NH4CuCl3. Physical Review Letters , 93 (3) , Article 037207. 10.1103/PhysRevLett.93.037207.

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Abstract

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.

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