Mott-induced structural transition in 2D metals electrons in the overdoped limit

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:68441

Rodriguez, J P ^[1]

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1. Los Alamos National Laboratory, NM (United States)

It is well-known now that the conduction electrons in the Copper-Oxygen planes common to all high-temperature superconductors experience strong repulsive interactions. The simplest theoretical description of this physics for electron densities approaching the antiferromagnetic Mott transition is given by the t-J model on the square-lattice, where double occuppancy of electrons at each site is strictly excluded. This constraint may be imposed by the introduction of an auxiliary slave-boson field, b{sub i}, such that the electron field is re-expressed as c{sub i{sigma}} {yields} c{sub i{sigma}}b{sub i}{sup {dagger}}, along with the constraint c{sub i{sigma}}{sup {dagger}}c{sub i{sigma}} + b{sub i}{sup {dagger}}b{sub i} = 1 at each site. Certain mean-field treatments of the latter constraint allowing the slave-boson to propagate result in a spin-charge separated description of the t-J model in terms of a spinon field, c{sub i{sigma}}, and a holon field, b{sub i}. A statistical gauge field, A{sub {mu}}, generated by the internal gauge symmetry (c{sub i{sigma}},b{sub i}) {yields} (e{sup i{theta}{sub i}}c{sub i{sigma}}, e{sup i{theta}{sub i}}b{sub i}) then mediates interactions between the two species. In particular, holon scattering off of gapless transverse gauge-field excitations results ultimately in a linear-in-T prediction for resistivity in the fluxless ({open_quotes}strange{close_quotes}) metallic phase of the t-J model, which is a feature that is consistently observed in the normal phase of the oxide superconductors.

• Research Organization: Los Alamos National Lab., NM (United States)
• OSTI ID: 68441
• Report Number(s): LA-UR--94-1148; CONF-931247--; ON: DE94009293
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COPPER OXIDES
DOPED MATERIALS
ELECTRONS
HIGH-TC SUPERCONDUCTORS
TWO-DIMENSIONAL CALCULATIONS
ZERO SOUND