A resolution to doping asymmetry puzzle in high Tc cuprates

Details A resolution to doping asymmetry puzzle in high Tc cuprates A resolution to doping asymmetry puzzle in high Tc cuprates

2005-05-20

arxiv.org/abs/cond-mat/0505509v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages LaTex file, 4 figures eps files, typos corrected

Scientific paper

We present a microscopic model for `electron doped' $Nd_{2-x}Ce_xCuO_4$ family and offer a resolution to a long standing doping asymmetry puzzle. Here, i) Ce atoms do not dope free electrons, instead a Ce atom effectively quenches a $Cu^{2+}$ spin moment at an adjacent site, at an energy scale > superexchange J of $CuO_2$ plane and `site dilutes' the Mott insulator. ii) Effective chemical pressure, caused by increased Ce substitution, induces a {\em first order Mott insulator to superconductor transition} in the $CuO_2$ plane. We predict, i) {\em equal number of +e and -e carriers} in metallic state and ii) a line of first order transition ending at a critical point in normal state. Phenomenology gets organized.

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