2001/11/30 by M. Matsuda, Masaaki Matsuda, M. Fujita +5 · 7 citations
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.65.134515
published as Phys. Rev. B 65, 134515 (2002) · submitted to Phys. Rev. B, 6 pages
arxiv created 2002/01/16 · openalex publication_date 2002/03/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The hole concentration dependence of the magnetic correlations is studied in very lightly doped La_2\ensuremath-xSrxCuO4 (x<0.02), which shows coexistence of a three-dimensional antiferromagnetic long-range-ordered phase and a spin-glass phase at low temperatures. It is found that the spin-glass phase in the coexistence region also shows a diagonal spin modulation as in the pure spin-glass phase in La_2\ensuremath-xSrxCuO4 (0.02<~x<~0.055). Below x\ensuremath∼0.02 the diagonal stripe structure is the same as that in x\ensuremath∼0.02 with a volume fraction almost proportional to hole concentration, suggesting that electronic phase separation of the doped holes occurs so that some regions with hole concentration ch\ensuremath∼0.02 and the rest with ch\ensuremath∼0 are formed. To our best knowledge, this represents the most direct observation to date of electronic phase separation in lightly doped antiferromagnets. Such phase separation has been predicted by a number of theories.