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The temperature dependences of the Hall-Lorenz numbers (Lxy) in a EuBa2Cu3Oy(Eu-123) single crystal before and after oxygen reduction are reported. Thestudy is based on data on the normal state longitudinal and transversaltransport coefficients. Namely, the temperature dependences of the electricalresistivity, Hall coefficient, longitudinal thermal conductivity, andtransverse thermal conductivity are presented. The set of measurements wasperformed for an optimally doped sample (y = 7), then the oxygen content in thethe same crystal was reduced to y = 6.65, and the measurements were repeated.For both cases Lxy's are about two times larger than the Sommerfeld's value ofthe Lorenz number and depend weakly on temperature in a range 300 - 160 K.Below T = 160 K the Hall-Lorenz number for the optimally doped sample slowlydrops, while the value of Lxy for the oxygen reduced sample begins to rise.Such results suggest that the electronic system in the investigated compoundmay be considered as a metallic one with pseudo-gaps that open at the Fermilevel.Comment: 17 pages, 4 figure

physical review. b, condensed matter and materials physics

Lorenz number in the optimally doped and underdoped superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Eu</mml:mi><mml:msub><mml:mi>Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mi>y</mml:mi></mml:msub></mml:mrow></mml:math>

Lorenz number in the optimally doped and underdoped superconductorEuBa2Cu3Oy