2007/10/30 by M. Kofu, Maiko Kofu, Tetsuya Yokoo +9
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.0710.5766
4pages, 3figures. submitted to PRB Rapid Communications. submitted to PRB Rapid Communications
arxiv created 2007/10/30 · openalex publication_date 2007/10/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We performed inelastic neutron experiments on underdoped La2-xSrxCuO4(x=0.10, Tc=28.6K) using a time-of-flight neutron scattering technique. Four incommensurate peaks on the two-dimensional reciprocal plane disperse inwards toward an antiferromagnetic zone center as the energy increases. These peaks merge into a single peak at an energy Ecross around w=40+-3meV. Beyond Ecross, the peak starts to broaden and ``hourglass-like'' excitations are observed. The Ecross in the underdoped sample is smaller than that reported for the optimally doped La1.84Sr0.16CuO4. The reduction of the Ecross is explained by the doping-independent slope of the downward dispersion below the Ecross combined with the smaller incommensurability in the underdoped sample. In the energy spectrum of chi"(w), we observed a similar "peak-dip-hump" structure in the energy region of 10~45meV to that reported for the optimally doped sample. We discuss the relation between the hourglass-shaped dispersion and the peak-dip-hump energy spectrum.