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Magnetic field-induced soft mode in spin-gapped high-Tc superconductors | | Brian M. Andersen
; Olav F. Syljuasen
; Per Hedegard
; | | Date: |
22 Apr 2009 | | Abstract: | We present an explanation of the dynamical in-gap spin mode in LSCO induced
by an applied magnetic field H as recently observed by J. Chang et al. 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=7T which in our scenario corresponds to the
field required for overlapping vortex regions. | | Source: | arXiv, 0904.3404 | | Services: | Forum | Review | PDF | Favorites | |
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