Electronic phase separation in lightly-doped La$_{2-x}$Sr$_x$CuO$_4$

Details Electronic phase separation in lightly-doped La$_{2-x}$Sr$_x$CuO$_4$ Electronic phase separation in lightly-doped La$_{2-x}$Sr$_x$CuO$_4$

2001-11-13

arxiv.org/abs/cond-mat/0111228v2

Phys. Rev. B 65, 134515 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

submitted to Phys. Rev. B, 6 pages

Scientific paper

10.1103/PhysRevB.65.134515

The hole concentration dependence of the magnetic correlations is studied in very lightly-doped La$_{2-x}$Sr$_x$CuO$_4$ ($x<$0.02), which shows coexistence of a three-dimensional antiferromagnetic (AF) long-range ordered phase and a spin-glass phase at low temperatures. It is found that the spin-glass phase in the coexistence region also shows a diagonal spin modulation as in the pure spin-glass phase in La$_{2-x}$Sr$_x$CuO$_4$ (0.02$\le x\le$0.055). Below $x\sim$0.02 the diagonal stripe structure is the same as that in $x\sim$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 $h_c\sim$0.02 and the rest with $h_c\sim$0 are formed. This result also indicates that the transition between the AF and spin-glass phase around $x$=0.02 is first order.

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