Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.22: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

High Magnetic Field Measurements on single crystalline (5-MAP)₂CuBr₄ — •Daniela Rauch¹, Jan Kreitlow¹, Yurii Skourski², Mark M. Turnbull³, and Stefan Süllow¹ — ¹Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, Braunschweig — ²Hochfeld-Magnetlabor Dresden, Forschungszentrum Dresden-Rossendorf, Dresden — ³Carlson School of Chemistry and Biochemistry, Clark University, Worcester, USA

(2-amino-5-methylpyridinium)₂CuBr₄, abbreviated as (5-MAP)₂CuBr₄, has been characterized as a square S=1/2 Heisenberg antiferromagnetic lattice [1,2]. The compound consists of two-dimensional sheets of highly distorted CuBr₄ tetrahedra separated by the organic cations. The magnetic coupling constants are 6.5 K for the intra-sheet coupling, 1.5 K for a residual inter-sheet coupling, with both interactions in effect resulting in an antiferromagnetic transition occurring at T_N=3.8 K.

Here we report a single crystal high magnetic field study on (5-MAP)₂CuBr₄, with magnetic fields up to 40 T at temperatures down to 1.5 K. From the data additional information on local anisotropies such as of the g-factor can be obtained and will be discussed.

[1] H. Place, R. Willett, Acta Cryst. C43 (1987) 1050.

[2] F.M. Woodward, A.S. Albrecht, C.M. Wynn, C.P. Landee, M.M. Turnbull, Phys. Rev. B 65 (2002) 144412