2003/12/31 by S. Wakimoto, Shuichi Wakimoto, H. Zhang +5 · 4 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Energy (signal processing) #Iron-based superconductors research #Omega #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Superconductivity #Thermodynamics #Unobservable #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.92.217004
published as Phys. Rev. Lett. 92, 217004 (2004) · 4 pages, 4 figures
openalex publication_date 2004/05/28 · arxiv created 2004/06/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The dynamic spin susceptibility, \ensuremathχ^\ensuremath'\ensuremath'(\ensuremathω), has been measured over the energy range of 2\ensuremath≤\ensuremathω\ensuremath≤10 meV for overdoped La_2\ensuremath-xSrxCuO4. Incommensurate (IC) spin excitations are observed at 8 K for all superconducting samples for 0.25\ensuremath≤x\ensuremath≤0.28 with \ensuremathχ^\ensuremath'\ensuremath' peaking at \ensuremath∼6 meV. The IC peaks at 6 meV become smaller in intensity with increasing x and, finally, become unobservable for a sample with x=0.30 which has no bulk superconductivity. The maximum \ensuremathχ^\ensuremath'\ensuremath' decreases linearly with Tc(onset) in the overdoped region, implying a direct cooperative relation between the spin fluctuations and the superconductivity.