Journal
PHYSICAL REVIEW B
Volume 80, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.052509
Keywords
exchange interactions (electron); fluctuations in superconductors; flux pinning; high-temperature superconductors; lanthanum compounds; magnetic structure; soft modes; strontium compounds; superconducting transition temperature
Funding
- Villum Kann Rasmussen foundation
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We present an explanation of the dynamical in-gap spin mode in La2-xSrxCuO4 induced by an applied magnetic field H as recently observed experimentally [J. Chang , 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.
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