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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.52: Poster
Thursday, March 17, 2011, 10:00–13:00, P1
Thermal expansion under pressure - test measurements on Azurite [Cu3(CO3)2(OH)2] — •Rudra Sekhar Manna and Michael Lang — Physikalisches Institut, Goethe-Universität Frankfurt (M), SFB/TR 49, D-60438 Frankfurt (M), Germany
Thermal expansion measurements provide a sensitive tool for exploring a material’s thermodynamic properties. Particularly strong effects in the expansivity are expected in cases where the Grüneisen parameter is large or even diverges. The latter situation is encountered upon approaching a quantum phase transition [1] or a finite-temperature critical end point [2], by, e.g., the application of hydrostatic pressure. Here we report on the realization of a dilatometer designed for measurements under Helium-gas pressure p ≤ 2.5 kbar. For test measurements, a single crystal of Azurite [Cu3(CO3)2(OH)2] - a realization of a one-dimensional distorted Heisenberg chain - has been used, where significant pressure effects are expected.
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