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Theory of the reentrant transition in a lamellar antiferromagnet: doped La2CuO4 |
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| Authors: | L I Glazman A S Ioselevich |
| Institution: | (1) Institute of Theoretical Physics, Chalmers University of Technology, S-41296 Goteborg, Sweden;(2) L.D. Landau Institute for Theoretical Physics, USSR Academy of Sciences, Kosygina Street 2, 117940 Moscow, USSR;(3) Present address: Institute of Problems or Microelectronics Technology and High-Purity Materials, USSR Academy of Sciences, 142432 Chernogolovka, Moscow district, USSR |
| Abstract: | The effect of impurity-induced states on the long range order in a lamellar antiferromagnet (AF) is studied and the magnetic phase-diagram of a lightly doped La2–x
Sr
x
CuO4 is proposed. It is shown that long range magnetic perturbations and the layered structure cause the shrinkage of AF domain on the phase diagram and lead to the reentrant AF transition. A nonmonotonous dependence of the correlation length  2D
on temperatureT is obtained; the dependence 2D
(x) is exponential for highT and 2D
 x
1/2 for lowT. |
| Keywords: | |
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