Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique
TT 16.89: Poster
Saturday, March 5, 2005, 11:00–16:30, Poster TU C
A hydrostatic pressure cell for precise resistivity measurement above 7 GPa at low temperatures in magnetic fields — •Takeshi Nakanishi — Kompetenzgruppe Hohe Drücke, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, D-01187 Dresden
We report recent developments in a new type of hydrostatic pressure cell [1] designed to measure the absolute value of the electrical resistivity in magnetic fields at low temperatures. This pressure cell, based on a technique using modified Bridgman anvils with a Teflon capsule that contains a liquid pressure transmitting medium, can generate nearly hydrostatic pressure at least up to P ≃ 7.1 GPa. The performance of this pressure cell was demonstrated by the electrical resistivity measurement on a single crystal of heavy fermion superconductor CeCu2(Si0.9Ge0.1)2 at low temperatures down to T = 50 mK [2]. Pressure is controlled with high accuracy (0 ≤ P ≤ 7 GPa). Very recently, we have succeeded in generating a hydrostatic pressure of 7.7 GPa when a load of 74 kN (≃ 7.5 ton) was applied. This implies a possibility that one can generate hydrostatic pressures above 10 GPa in the more compact size of this pressure cell. We present a modified design of the present pressure cell, which can be fitted to a commercial PPMS (Physical Property Measurement System, Quantum Design). [1] T. Nakanishi, N. Takeshita and N. Môri, Rev. Sci. Instrum. 73, 1828 (2002). [2] T. Nakanishi, G. Sparn, H.S. Jeevan, M. Deppe, C. Geibel and F. Steglich, to be published in Proccedings of the International Conference on Strongly Correlated Electron Systems, Karlsruhe, Germany, July 26-30, 2004.