Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 11: Postersitzung II (Metall-Isolator-Überg
änge, Phasenüberg
änge in Quantensystemen, Theorie: Systeme korrelierter Elektronen)
TT 11.4: Poster
Dienstag, 25. März 2003, 14:30–19:00, P2c, P2d
A New Pressure Cell for Scattering Studies of Charge and Orbital Order — •Sven Kiele1,2, Jochen Geck1, Martin von Zimmermann2, Bernd Büchner1, and Mohsen M. Abd-Elmeguid3 — 1II. Physikalisches Institut A, RWTH Aachen, Huyskensweg, D-52056 Aachen, Germany — 2Hamburger Synchrotronsstrahlungslabor am Deutschen Elektronensynchrotron, Notkestr. 85, D-22603 Hamburg, Germany — 3II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
We present a clamp-type piston-cylinder cell for
high-energy scattering. It has been designed for the application
of pressures up to 2.5 GPa under hydrostatic conditions. Due to
the relative low absorption it is possible to use the cell for
scattering studies of charge- and orbital-order superlattice
reflections which are orders of magnitude smaller than Bragg
reflections. The pressure is determined measuring the variation
of the lattice parameter of gold.
First experiments have been done on a
Pr0.7(Ca0.9Sr0.1)0.3MnO3 single crystal.
The macroscopic properties of this system are well studied with a
variety of methods. Particularly measurements of the electrical
transport under pressure show a breakdown of the insulating state
related to a melting of the charge order at low temperatures in
contrast to the behaviour at ambient pressure. In our study with
high-energy synchrotron radiation we gained a first insight into
the structural aspects of this pressure induced melting. Further
experiments should complete our data and also explain a scaling
relation of the pressure- and the magnetic-induced melting of the
order observed in electrical transport.