A. S. Cooper | Researchain

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Featured researches published by A. S. Cooper.

Physical Review B | 1988

Electronic structure studies of La/sub 2/CuO/sub 4/

A.L. Wachs; P. E. A. Turchi; Y. C. Jean; K. H. Wetzler; R. H. Howell; M. J. Fluss; D. R. Harshman; J. P. Remeika; A. S. Cooper; R. M. Fleming

We report results of positron-electron momentum-distribution measurements of single-crystal La/sub 2/CuO/sub 4/ using two-dimensional angular correlation of positron-annihilation-radiation techniques. The data contain two components: a large (approx.85%), isotropic corelike electron contribution and a remaining, anisotropic valence-electron contribution modeled using a linear combination of atomic orbitals--molecular orbital method and a localized ion scheme, within the independent-particle model approximation. This work suggests a ligand-field Hamiltonian to be justified for describing the electronic properties of perovskite materials.

Physical Review B | 1989

Transport studies of La_(2-x)Sr_xCuO_4 near the insulator-metal-superconductor transition

Brett Ellman; H. M. Jaeger; D. P. Katz; T. F. Rosenbaum; A. S. Cooper; G. P. Espinosa

Physical Review B | 1988

Freezing of spin and charge in La/sub 2-//sub x/Sr/sub x/CuO/sub 4/

D. R. Harshman; G. Aeppli; G. P. Espinosa; A. S. Cooper; J. P. Remeika; E. J. Ansaldo; T. M. Riseman; Williams Dl; D. R. Noakes; Brett Ellman; T. F. Rosenbaum

Physical Review Letters | 1989

Magnetic dynamics of La_{2}CuO_{4} and La_{2-x}Ba_{x}CuO_{4}

Gabriel Aeppli; Stephen M Hayden; H. A. Mook; Z. Fisk; S.-W. Cheong; Daniel Rytz; J. P. Remeika; G. P. Espinosa; A. S. Cooper

Physical Review B | 1988

Freezing of spin and charge in La_{2-x}Sr_{x}CuO_{4}

Dale R. Harshman; Gabriel Aeppli; G. P. Espinosa; A. S. Cooper; J. P. Remeika; E. J. Ansaldo; T. M. Riseman; D. Li. Williams; D. R. Noakes; Brett Ellman; T. F. Rosenbaum

Physical Review Letters | 1991

Electronic states in La_{2-x}Sr_{x}CuO_{4+d} probed by soft-x-ray absorption

C. T. Chen; F. Sette; Yong-Ji Ma; Mark S. Hybertsen; E. B. Stechel; W. Matthew C. Foulkes; M. Schulter; S.-W. Cheong; A. S. Cooper; L. W. Rupp; Bertram Batlogg; Y. L. Soo; Zhi-Hong Ming; Alexander Krol; Yao-Huang Kao

Physical Review Letters | 1989