Physics – Condensed Matter – Superconductivity
Scientific paper
1999-08-10
Physics
Condensed Matter
Superconductivity
10 pages, LaTeX, 3 EPS figures; to be published in Journal of Physics: Condensed Matter
Scientific paper
10.1088/0953-8984/11/34/309
Measurements of the static magnetization, susceptibility and ESR of Gd spin probes have been performed to study the properties of antiferromagnetically ordered La_{2-x-y}Eu_ySr_xCuO_4 (x less or equal 0.02) with the low temperature tetragonal structure. According to the static magnetic measurements the CuO_2 planes are magnetically decoupled in this structural phase. The ESR study reveals strong magnetic fluctuations at the ESR frequency which are not present in the orthorhombic phase. It is argued that this drastic enhancement of the spin fluctuations is due to a considerable weakening of the interlayer exchange and a pronounced influence of hole motion on the antiferromagnetic properties of lightly hole doped La_2CuO_4. No evidence for the stripe phase formation at small hole doping is obtained in the present study.
Berg Hellmut
Buechner Bernd
Huecker Markus
Kataev Vladislav
Validov A.
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