In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2}
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
- J. Stefan Institute, SI-1000 Ljubljana (Slovenia)
- Rutherford Appleton Laboratory, ISIS Pulsed Neutron Facility, Chilton, Didcot, Oxon OX110QX (United Kingdom)
High resolution neutron scattering measurements on a single crystal of SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2} with x{approx}0.05 reveal the presence of new spin excitations within the gap of this quasi-two-dimensional, singlet ground state system. The application of a magnetic field induces Zeeman-split states associated with S=1/2 unpaired spins which are antiferromagnetically correlated with the bulk singlet. Substantial broadening of both the one- and two-triplet excitations in the doped single crystal is observed, as compared with pure SrCu{sub 2}(BO{sub 3}){sub 2}. Theoretical calculations using a variational algorithm and a single quenched magnetic vacancy on an infinite lattice are shown to qualitatively account for these effects.
- OSTI ID:
- 20861488
- Journal Information:
- Physical Review Letters, Vol. 97, Issue 24; Other Information: DOI: 10.1103/PhysRevLett.97.247206; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
Similar Records
Crystallization of spin superlattices with pressure and field in the layered magnet SrCu2(BO3)2
Discovery of quantum phases in the Shastry-Sutherland compound SrCu2(BO3)2 under extreme conditions of field and pressure