The authors study spin-triplet excitations in the strongly correlated spin-1/2 dimer system Sr ${}_{3}$ Cr ${}_{2}$ O ${}_{8}$ via inelastic neutron scattering. They find that the thermal broadening of the excitations can be accurately described by going beyond RPA via diagrammatic high-density $1/z$ expansion.The authors study spin-triplet excitations in the strongly correlated spin-1/2 dimer system Sr${}_{3}$Cr${}_{2}$O${}_{8}$ via inelastic neutron scattering. They find that the thermal broadening of the excitations can be accurately described by going beyond RPA via diagrammatic high-density $1/z$ expansion.

Physical Review BApr 11, 201411 citations

Spectral densities from dynamic density-matrix renormalization

Carsten Raas, Götz Silvester Uhrig

arXiv:cond-mat/0412224The European Physical Journal BJun 1, 200537 citations

The authors study spin-triplet excitations in the strongly correlated spin-1/2 dimer system Sr

{}_{3}

{}_{2}

{}_{8}

via inelastic neutron scattering. They find that the thermal broadening of the excitations can be accurately described by going beyond RPA via diagrammatic high-density

1/z

expansion.