LOCAL ELECTRONIC STRUCTURE OF DOPING ATOMS INMA2Can-1CunO2n+3HIGH-TcSUPERCONDUCTORS WITH[M-12(n-1)n]TYPE STRUCTURES

E. Z. Kurmaev, A. Moewes, N. D. Zhigadlo, E. Takayama-Muromachi, I. A. Nekrasov, O. A. Bureev, G. T. Woods, T. A. Callcott, Yu. M. Yarmoshenko, S. N. Shamin, D. L. Ederer and M. Yanagihara
Additional contact information
E. Z. Kurmaev: Institute of Metal Physics, Russian Academy of Sciences–Ural Division, 620219 Yekaterinburg GSP-170, Russia
A. Moewes: Department of Physics and Engineering Physics, University of Saskatchewan,116 Science Place Saskatoon, Saskatchewan S7N 5E2, Canada
N. D. Zhigadlo: National Institute for Research in Inorganic Materials (NIRIM), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan;
E. Takayama-Muromachi: National Institute for Research in Inorganic Materials (NIRIM), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
I. A. Nekrasov: Department of Theoretical Physics and Applied Mathematics, Ural State Technical University, USTU-UPI, 19 Mira Str., Yekaterinburg 620002, Russia
O. A. Bureev: Department of Theoretical Physics and Applied Mathematics, Ural State Technical University, USTU-UPI, 19 Mira Str., Yekaterinburg 620002, Russia
G. T. Woods: University of Tennessee, Knoxville, Tennessee 37996, USA
T. A. Callcott: University of Tennessee, Knoxville, Tennessee 37996, USA
Yu. M. Yarmoshenko: Institute of Metal Physics, Russian Academy of Sciences–Ural Division, 620219 Yekaterinburg GSP-170, Russia
S. N. Shamin: Institute of Metal Physics, Russian Academy of Sciences–Ural Division, 620219 Yekaterinburg GSP-170, Russia
D. L. Ederer: Department of Physics, Tulane University, New Orleans, LA 70118, USA
M. Yanagihara: Research Institute for Scientific Measurements, Tohoku University, Sendai 980-77, Japan

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 1345-1349

Abstract: Results of X-ray fluorescence measurements ofMA2Can-1CunO2n + 3compounds with[M-12(n-1)n]type structures, (C0.8N0.2Sr2CuO5.3,[Cu0.25(C,N)0.75]Sr2CaCu2Oy,Cu0.5V0.5Sr2CaCu2O7.5,Cu0.5V0.5Sr2Ca2Cu3O9.4,Cu0.5V0.5Sr2(Ca3.6Sr0.4)Cu5O13.5andCu0.5V0.5Sr2(Ca4.7Sr0.3)Cu6O15.3, are presented. The experiments show that C-atoms form a distortedCO3oxyacid group with a partial substitution of copper and nitrogen atoms in the M-sites. We conclude that theCO32-group in (C,N)Sr2Can-1CunOyand (Cu,C,N)Sr2Can-1CunOyis substituted by theNO2-which induces the creation of the hole carriers in these compounds. We have found that V-atoms in the given compounds form(VO4)3-tetrahedrons and have a pentavalent state.

Date: 2002
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DOI: 10.1142/S0218625X02003780

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