On the contrasting spin dynamics of $La_{2-x}Sr_xCuO_4$, $Nd_{2-x}Ce_xCuO_4$ and $YBa_2Cu_3O_{6+x}$ near half filling

Andrey V. Chubukov; Karen A. Musaelian

doi:10.1088/0953-8984/7/1/012

paper

On the contrasting spin dynamics of $L a_{2 - x} S r_{x} C u O_{4}$ , $N d_{2 - x} C e_{x} C u O_{4}$ and $Y B a_{2} C u_{3} O_{6 + x}$ near half filling

arXiv:cond-mat/9407074 · doi:10.1088/0953-8984/7/1/012

Abstract

We present simple calculations which show that incommensurability upon doping and the width of the magnetically ordered phase in Mott-Hubbard insulators depend strongly on the location of the hole/electron pockets in the Brillouin zone. For $L a S r C u O$ systems, we found the pockets at $(\pm π /2, \pm π /2)$ , in which case the corrections to the antiferromagnetic spin stiffness grow with doping and destroy the commensurate antiferromagnetic ordering already at a very small doping. On the other hand, in $N d C e C u O$ , the hole pockets are located at $(π, 0)$ and the symmetry related points, in which case the corrections to the stiffness scale linearly with the density of carriers and do not destroy commensurate spin ordering. For $Y B C u O$ , systems the situation is less certain, but our results favor hole pockets at $(π /2, π /2)$ . We also discuss briefly the tendency towards phase separation.

18 pages, LaTex

On the contrasting spin dynamics of $L a_{2 - x} S r_{x} C u O_{4}$ , $N d_{2 - x} C e_{x} C u O_{4}$ and $Y B a_{2} C u_{3} O_{6 + x}$ near half filling

Abstract

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On the contrasting spin dynamics of La2−x​Srx​CuO4​, Nd2−x​Cex​CuO4​ and YBa2​Cu3​O6+x​ near half filling

Abstract

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Cited by in corpus (7)

On the contrasting spin dynamics of $L a_{2 - x} S r_{x} C u O_{4}$ , $N d_{2 - x} C e_{x} C u O_{4}$ and $Y B a_{2} C u_{3} O_{6 + x}$ near half filling