X-ray emission spectra of vanadium atoms in a new series of (Cu,V)-based high-<em>T</em><sub>c</sub> superconductors期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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X-ray emission spectra of vanadium atoms in a new series of (Cu,V)-based high-T_c superconductors

Authors:	EZ Kurmaev GT Woods ND Zhigadlo E Takayama-Muromachi DL Ederer

Institution:	^a Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620219 Yekaterinburg GSP-170, Russia ^b Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, Canada S7N 5E2 ^c University of Tennessee, Knoxville, TN 37996, USA ^d National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan ^e Department of Physics, Tulane University, New Orleans, LA 70118, USA

Abstract:	Non-resonant V L_2,3 and OKα X-ray emission spectra of a new series of (Cu,V)Sr₂Ca_n−1Cu_nO_y (n=3-7) superconductors are presented. We have found that oxygen atoms surround V-atoms in the given compounds, form a (VO₄)³⁻ tetrahedrons and have a pentavalent state. This induces holes due to the substitution of divalent copper by pentavalent vanadium ions providing a hole-doping mechanism of superconductivity in this series of compounds. A spectral estimation of the oxygen concentration shows that the oxygen content under high-pressure/high-temperature synthesis conditions is not changed considerably from the start to the final product.

Keywords:	78 70 En 74 72 Jt 74 25 Jb
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