2019/08/31 by D. Blosser, V. K. Bhartiya, David Voneshen +2 · 4 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Antiferromagnetism #Chemistry #Condensed matter physics #Coupling (piping) #Crystallography #Inelastic neutron scattering #Magnetism in coordination complexes #Materials science #Neutron #Neutron scattering #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.100.144406
published in Physical review. B./Physical review. B 100(14) (American Physical Society)
openalex publication_date 2019/10/02 · arxiv created 2019/10/04 · arxiv updated 2019/10/07 · openalex created_date 2019/10/10 · openalex updated_date 2026/08/05
The S=1/2 spin ladder compound (C5H12N)2CuBr4 (BPCB) is studied by means of high-resolution inelastic neutron scattering. In agreement with previous studies we find a band of triplet excitations with a spin gap of \ensuremath∼0.8 meV and a bandwidth of \ensuremath∼0.6 meV. In addition, we observe a distinct splitting of the triplet band of 50(1)\phantom\rule4pt0ex\ensuremathμeV or 40(2)\phantom\rule4pt0ex\ensuremathμeV at the band minimum or maximum, respectively. By comparison to a strong-coupling expansion calculation of the triplet dispersion for a spin ladder with anisotropic exchange, weakly anisotropic leg interactions are identified as the dominant source of magnetic anisotropy in BPCB. Based on these results, we discuss the nature of magnetic exchange anisotropy in BPCB and in related transition-metal insulators.