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PPMS® (Physical Property Measurement System)

Bei dem PPMS handelt es sich um ein automatisiertes Tieftemperatur- und Magnetsystem zur Messung von Materialeigenschaften wie Spezifische Wärme, magnetische AC- und DC-Suszeptibilität und elektronische und thermische Transporteigenschaften (z.B. Hall-Effekt, thermoelektischer Effekt). Es hat sich gezeigt, dass vielfach der Nachwuchsmangel bei den Physikern und die problemlose Bedienung und Zuverlässigkeit des Gerätes bei den Chemikern die ausschlaggebenden Gründe für die Beschaffung eines solchen "Alleskönners" waren. Die verschiedenen Messmöglichkeiten (Optionen) ergeben sich durch Verwendung verschiedener Messeinsätze oder Probenhalter und Aufruf des entsprechenden Softwaremoduls. Feldbereich: bis 16 Tesla Temperaturbereich: 0,4 - 400 K

Vorveröffentlichung: PPMS-DynaCool

Ein integrierter Pulsröhrenkühler macht das PPMS völlig unabhängig von kryogenen Flüssigkeiten.
→ Details hier

Features:

Sealed sample chamber with 26 mm diameter sample access

Novel sample mounts couple easily to the 12 electrical leads built into the cryostat insert

The Model 6000 is a self contained microprocessor-controlled device, eliminating the need to use or purchase external bridges, current or voltage sources or lock-in amplifiers.

Continuous Low-Temperature Control - maintains temperature below 4.2 K for indefinite periods of time and offers smooth temperature transitions when warming and cooling through the 4.2 K

Temperature sweep mode

MulitVu control software

Magnet Options:

7, 9, 14 and new 16 Tesla magnet

Split-coil 7 Tesla transverse magnet

Measurement applications:

Heat Capacity

Heat Capacity Measurement System

- Completely automated relaxation technique from 1.9-400 K

- Integrated data acquisition electronics and analysis software

Helium-3 Refrigerator

- Continuous operation down to 0.5 K (0.4 K in one-shot mode for approx. 0.5 h)

- Designed for heat capacity and resistivity measurements

Magnetometry

Vibrating Sample Magnetometer (VSM)

- RMS Sensitivity: < 10-6 emu with 1 sec averaging

- Optional 1000 K oven

AC Susceptibility & DC Magnetization Option (ACMS)

- Digital signal processing for increased sensitivity: 10-8 emu (AC); 2.5 x 10-5 emu (DC)

- Direct phase nulling technique measures and cancels background AC phase shifts at every measurement

Torque Magnetometry

- Magnetic moment measurements via the magnetic torque = m x B

- Designed to measure moments of very small anisotropic samples

Ultra Low Field (ULF)

- Reduces residual field to < 0.05 G

Electro-transport

DC Resistivity

- Four independent channels for performing dc resistivity

AC Transport

- For performing Hall Effect AC Resistivity, I-V Curve Tracing, and Critical Current measurements

- 1 nV sensitivity, nW resolution at 2 A

- Drive amplitude 10 µA to 2 A – Important information (PDF, 214 KB)

Horizontal & Vertical Sample Rotators

- Thermometer located on rotator platform

- Precision, stepper controlled rotator

Multi-Function Probe

- Direct axial ports to the sample stage are provided to install light pipes, fiber optic cables, microwave guides and/or extra electrical leads.

Thermal Transport

AC Resistivity ρ

- Measured by using precision DSP current source and phase-sensitive voltage detection.

Thermal Conductivity κ

- Measured by applying heat from the heater shoe in order to create a user-specified temperature differential between the two thermometer shoes.

Seebeck Coefficient α

- Measured by creating a specified temperature drop between the two thermometer shoes – just as it does to measure thermal conductivity. However, for Seebeck coefficient the voltage drop created between the thermometer shoes is also monitored.

Thermoelectric Figure of Merit ZT

- Determined here simply as the algebraic combination α2T /(κρ) of the three measured quantities – thermal conductivity, Seebeck coefficient, and AC electrical resistivity.

PDF-Download

Physical Property Measurement System (PDF, 695 KB)

Heat Capacity & He-3 (PDF, 181 KB)

Magnetometry (PDF, 304 KB)

AC Susceptibility (PDF, 298 KB)

Electro-Transport (PDF, 301 KB)

Thermal Transport (PDF, 392 KB)

PPMS Evercool™ Dewar (PDF, 77 KB)

PPMS®-16 Tesla (PDF, 138 KB)

Seiten in diesem Kapitel

PPMS

16 Tesla PPMS

Vibrating Sample Magnetometer

Model P850

PPMS-DynaCool

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Ihr Kontakt:

Dr. Marc Kunzmann
Tel.: +49 6151 880646
Fax: +49 6151 896667
kunzmann@lot-oriel.de

David Appel
Tel.: +49 6151 88 06 499
Fax: +49 6151 896667
appel@lot-oriel.de

Links:


Quantum Design:
→	www.qd-international.com

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	LOT-Oriel GmbH & Co. KG E-mail: info@lot-oriel.de				Im Tiefen See 58 D-64293 Darmstadt				Tel.: +49 6151 - 88 06 0 Fax: +49 6151 - 896667		emotiv design