Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.5: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

Crystal growth and properties of Nd_2−xCa_2+xCu₅O₁₀ and Y_2−xCa_2+xCu₅O₁₀ — •Nadja Wizent¹, Günter Behr¹, Wolfgang Löser¹, Mircea Apostu², and Bernd Büchner¹ — ¹IFW Dresden, Institute for Solid State Research, Germany — ²Al.I. Cuza University, Iasi, Romania

The copper oxide-based compounds are known for interesting properties like superconductivity, spin and charge ordering. Single crystals of cuprates with Nd/Y and different Ca-doping were grown by a Floating Zone method under air and elevated oxygen pressure.

Because single crystalline samples of Y_2−xCa_2+xCu₅O₁₀ have not been available for a long time the structure has not been solved until recently [1,2]. The compound is also interesting because of its change from antiferromagnetic ordering through spin glass to a spin gap state at higher Ca-doping (1.4 ≤ x ≤ 1.67) [3].

Further investigations by neutron diffraction and magnetic measurements on doped samples of Y_2−xCa_2+xCu₅O₁₀ and Nd_2−xCa_2+xCu₅O₁₀ are under way.

[1] J. Thar: Diploma Thesis, Aachen (2005)

[2] Y. Gotoh et al.: J. Alloys & Comp. 408 (2006)

[3] K. Kudo et al.: Phys. Rev. B 71 (2005) 104413