ANTIFERRODISTORTIVE STRUCTURAL PHASE-TRANSITION IN THE JAHN-TELLER SYSTEM DYKMO2O8 .2. MAGNETIC-FIELD DEPENDENCE

Journal article

We have measured the magnetic field dependence of the electronic excitations of DyKMo2O8, which undergoes a cooperative Jahn-Teller distortion at TD=14 K. The Raman spectrum shows two modes at 2 K which split into a number of peaks with increasing field. New low-energy excitations are observed which are interpreted as arising from the splitting of the ground and excited states. The energies of these lines vary monotonically with fields up to 9 T for fields parallel to the crystallographic directions X and Y. However, for fields at intermediate directions in the x-y plane the energies are found to change abruptly at a critical value which is direction-dependent. This effect is interpreted as being due to the creation of a new form of distortion. The authors have developed a mean-field model for this field-induced ordering, which provides a satisfactory qualitative description of the experimental results. © 1987 IOP Publishing Ltd.

Authors: Mihailovic, D; Ryan, J

• Publication status: Published
• Journal: JOURNAL OF PHYSICS C-SOLID STATE PHYSICS
• Volume: 20
• Issue: 20
• Pages: 3063-3073
• Publication date: 1987-07-20
• DOI: 10.1088/0022-3719/20/20/013
• ISSN: 0022-3719
• Language: English