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Groupe d'Etude de la Matière Condensée (GEMaC), Université de Versailles Saint-Quentin-en-Yvelines - CNRS

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GEMAC > Moyens expérimentaux > Mesures de transport et magnétisme (PPMS) -OPEN ACCESS FACILITY

Mesures des propriétés de transport et magnétiques jusqu’à 9T et jusqu’à 1000K

“NOVATECS” Open access facility


Site de réservation en ligne: http://www2.gemac.uvsq.fr/novatecs/
Responsable: yves.dumont@uvsq.fr

Environment: « PPMS-9T » from Quantum Design Inc.
Magnetic field [-9T; 9T] ; residual ~10e-4T
Temperature: [1.9K; 400K] in standard mode
[300K; 1000K] with “oven zirconia sticks”
Chamber: Helium atmosphere at low temperature
~8 torr in standard mode and <10e-3 torr with activated cryo-pump

Working Options :

Vibrating Sample Magnetometry (VSM)

a) 1.9K-400K VSM:
Small bore option (VSM SB): sample <3.5mm large; measured sensitivity 3x10e-6 emu
Large bore option (VSM LB): sample <5mm large for cylinders and 10mm for thin films; measured sensitivity 10e-5emu

b) 300K-1000K VSM (VSM oven):
Based on a small “oven integrated” zirconia stick with thermometer (10 mm large); accuracy 0.5K.Working only with cryopump activated and measured sensitivity 10e-5emu

DC resistivity

[1.9K; 400K] temperature range, [-9T; 9T] magnetic field
- H perpendicular to sample holder (“puck”)
- or electro-optical probe with manual rotation versus H direction between 0° to 90°
Sample space 8×9 mm2 for 3 independent “4-point” measurements
Max. resistance < 2 MΩ

Time-resolved luminescence measurements under a high magnetic field


Time-resolved luminescence measurements under a high magnetic field (up to 9 T) and with temperature control over a wide range are not feasible with most available commercial systems. Furthermore, the supporting material to be used must be non-magnetic and the required optical fibers must withstand low temperatures (down to 1.9 K in this case). The Physical Property Measurement System (PPMS) from Quantum Design, available on GeMaC, Versailles (France) is equipped with a customized electro-optical probe composed of three optical bundles consolidated in one non-magnetic tube. This specific system allows performing millisecond time-resolved optical measurements in a broad temperature range (from 1.9 K up to 400 K) and with magnetic fields up to 9 T, by connecting both the light source and the detector to two different optical fibers, one used to deliver the excitation light to the sample and the other to collect the emitted light from the sample. The distance between the fibers and sample is adjustable.



Fig. 1. Scheme of the sample holder.

Resistivity and Hall Effect for Extra High Resistance Materials


Conventional PPMs(Quantum design) equipment gives possibility to measure samples having up to R=1W Resistance. This limitation makes impossible to study at low temperatures thin films of many complex oxides and semiconducting diamond. In GEMaC we elaborated special option (hardware and software  ) named “Tornado” enabling us to perform in Van der Paw configuration Resistivity and hall Effect Measurements for samples up to R=1010W Resistance.

Dernière mise à jour de cette page : 3 novembre 2016


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