2009/04/22 by Brian M. Andersen, Olav F. Syljuåsen, Olav F. Syljuasen +2
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.80.052509
published as Phys. Rev. B 80, 052509 (2009) · 4 pages, 3 figs
arxiv created 2009/04/22 · openalex publication_date 2009/08/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We present an explanation of the dynamical in-gap spin mode in La_2\ensuremath-xSrxCuO4 induced by an applied magnetic field H as recently observed experimentally [J. Chang et al., Phys. Rev. Lett. 102, 177006 (2009)]. Our model consists of a phenomenological spin-only Hamiltonian, and the softening of the spin mode is caused by vortex pinning of dynamical stripe fluctuations which we model by a local ordering of the exchange interactions. The spin gap vanishes experimentally around H=7 T, which in our scenario corresponds to the field required for overlapping vortex regions.