Physics – Condensed Matter – Superconductivity
Scientific paper
2005-06-10
J. Phys.: Condens. Matter 17 (2005) L499-L505
Physics
Condensed Matter
Superconductivity
Minor revisions. Accepted for publication in J. Phys.: Condens. Matter as a Letter
Scientific paper
10.1088/0953-8984/17/46/L03
We present evidence that the antiferromagnetic spin correlations in optimally doped YBa_2Cu_3O_7 and underdoped YBa_2Cu_4O_8 develop a surprisingly strong anisotropy in the superconducting state. Comparing the ratio of the nuclear spin-lattice relaxation rates of the planar copper and oxygen, measured at the lowest and highest temperatures as well as at T_c, we conclude that the antiferromagnetic in-plane correlations vanish as the temperature goes to zero. This observation is corroborated by the measurement of the copper linewidth in YBa_2Cu_4O_8. In contrast, the out-of-plane correlations do not change appreciably between T=T_c and T=0. Within a model of fluctuating fields this extreme anisotropy of the antiferromagnetic correlations also explains the observed temperature dependence of the anisotropy of the copper relaxation measured in a low external magnetic field.
Mali Mihael
Meier P. F.
Roos Johanna
Uldry A.
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