Magnetic analog of the isotope effect in cuprates
Abstract
We present extensive magnetic measurements of the (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy system with its four different families (x) having a Tcmax(x) variation of 28% and minimal structural changes. For each family, we measured the Néel temperature, the anisotropies of the magnetic interactions, and the spin-glass temperature. Our results exhibit a universal relation Tc=cJns for all families, where ctilde 1 , J is the in-plane Heisenberg exchange, and ns is the superconducting carrier density. This relates cuprate superconductivity to magnetism in the same sense that phonon-mediated superconductivity is related to atomic mass.
- Publication:
-
Physical Review B
- Pub Date:
- December 2006
- DOI:
- arXiv:
- arXiv:cond-mat/0606695
- Bibcode:
- 2006PhRvB..74v0508O
- Keywords:
-
- 74.40.+k;
- 05.70.Ln;
- 74.25.Fy;
- 74.62.-c;
- Fluctuations;
- Nonequilibrium and irreversible thermodynamics;
- Transport properties;
- Transition temperature variations;
- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- With an additional inset in Fig.4