Magnetic analog of the isotope effect in cuprates

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Rinat Ofer,¹ Galina Bazalitsky,¹ Amit Kanigel,¹ Amit Keren,¹ Assa Auerbach,¹ James S. Lord,² and Alex Amato³
¹Physics Department, Technion-Israel Institute of Technology, Haifa 32000, Israel
²Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, United Kingdom
³Paul Scherrer Institute, CH 5232 Villigen PSI, Switzerland

Received 30 October 2006; published 13 December 2006

Wepresent extensive magnetic measurements of the (Ca_xLa_1−x)(Ba_1.75−xLa_0.25+x)Cu₃O_y system with itsfour different families (x) having a T <sub>c</sub><sup>max</sup> (x) variation of 28%and minimal structural changes. For each family, we measured theNéel temperature, the anisotropies of the magnetic interactions, and thespin-glass temperature. Our results exhibit a universal relation T_c=cJn_s forall families, where c~1, J is the in-plane Heisenberg exchange,and n_s is the superconducting carrier density. This relates cupratesuperconductivity to magnetism in the same sense that phonon-mediated superconductivityis related to atomic mass.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.220508
DOI:	10.1103/PhysRevB.74.220508
PACS:	74.40.+k; 05.70.Ln; 74.25.Fy; 74.62.-c 74.40.+k Fluctuations in superconductors including noise, chaos, nonequilibrium superconductivity, localization, etc 05.70.Ln Nonequilibrium and irreversible thermodynamics 74.25.Fy Transport properties of superconductors including electric and thermal conductivity, thermoelectric effects, etc 74.62.-c Transition temperature variations (superconductivity) YEAR: 2006
KEYWORDS:	isotope effects, calcium compounds, lanthanum compounds, barium compounds, high-temperature superconductors, Neel temperature, magnetic anisotropy, spin glasses, Heisenberg model, carrier density, phonons, atomic mass

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