The magnetic states of lightly hole-doped cuprates in the clean limit

Details The magnetic states of lightly hole-doped cuprates in the clean limit The magnetic states of lightly hole-doped cuprates in the clean limit

2009-11-29

arxiv.org/abs/0911.5488v2

Phys. Rev. B 81,104507 (2010)

Physics

Condensed Matter

Superconductivity

11 pags, 10 figs v2: notation changes: Quenched and Reentrant >>> Frozen, accordingly pedex Q and R >>> F

Scientific paper

10.1103/PhysRevB.81.104507

We have performed extensive zero field muSR experiments on pure YBa2Cu3O6+y and diluted Y-rare-earth substituted Y0.92Eu0.08Ba2Cu3O6+y and Y0.925Nd0.075Ba2Cu3O6+y at light hole-doping. A common magnetic behavior is detected for all the three families, demonstrating negligible effects of the isovalent Y-substituent disorder. Two distinct regimes are identified, separated by a crossover, whose origin is attributed to the concurrent thermal activation of spin and charge degrees of freedom: a thermally activated and a re-entrant quenched-hole antiferromagnetic regime. The peculiar temperature and hole density dependence of the magnetic moment m(h,T) fit a model with a (spin) activation energy for the crossover between the two regimes throughout the entire investigated range. The magnetic moment is suppressed by a simple dilution mechanism both in the reentrant regime (0

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