Universality of the Electronic Structure from a Half Filled CuO_2 Plane

Details Universality of the Electronic Structure from a Half Filled CuO_2 Plane Universality of the Electronic Structure from a Half Filled CuO_2 Plane

2002-09-27

arxiv.org/abs/cond-mat/0209651v1

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 18 figures; A high quality pdf is available at http://helios.physics.utoronto.ca/~fronning/RonningInsResub.pdf (2.8M

Scientific paper

10.1103/PhysRevB.67.035113

We present angle resolved photoemission (ARPES) data from insulating A_2CuO_2X_2 (A=Sr, Ca; X=Cl, Br), Sr_2Cu_3O_4Cl_2, and Bi_2Sr_2MCu_2O_8 (M=Er, Dy) single crystals which illustrate that the low energy electronic structure of the half-filled cuprates are independent of the apical atom. By performing a photon energy dependent study on Ca_2CuO_2Cl_2 we are able to distinguish between features which are intrinsic and those which are a result of the photoemission matrix elements. We find that the dispersion is independent of photon energy, while an asymmetry in the electron occupation probability across the antiferromagnetic zone boundary is robust to variations in photon energy. Finally, we show that the d-wave-like dispersion which exists in the insulator along the antiferromagnetic zone boundary does not precisely fit the simple d-wave functional form near the nodal direction.

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