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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.37: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Thermal expansion and magnetostriction measurements at sub Kelvin temperatures - experiments on the frustrated quantum magnet Cs₂CuCl₄ — •satya krishna Thallapaka, Bernd Wolf, and Michael Lang — Physikalisches Institut, Goethe-Universität Frankfurt (M), SFB/TR49, D-60438 Frankfurt (M), Germany.

We describe the device suitable for high-resolution thermal expansion and magnetostriction measurements using a capacitive dilatometer [1] which measures length changes with a sensitivity of Δl ≥ 10⁻² Å, corresponding to a relative resolution of Δl/l ∼ 10⁻¹⁰. The system operates down to 40 mK and in magnetic fields up to 18 T. We report measurements on the spin S = 1/2 triangular-lattice Heisenberg antiferromagnet Cs₂CuCl₄ aiming at exploring its field-induced quantum critical point.
R. Pott and R. Schefzyk, J. Phys. E 16, 444 (1983)