Quantum Design PPMS System

Core system

PPMS System bundles the same core system as the MPMS-XL, except for the SQUID detection system. A pinout system is available instead, thus making it possible to electrically contact the sample under study and measure its transport properties (resistance, Hall effect, magnetoresistance…).

The core system makes possible to generate magnetic fields up to 90kOe and to control the sample space temperature to any value between 2K and 400K with a stability condition of less than 0.1% of oscillation.

PPMS is not only limited to electrical measurements, since the electrical contacts at the sample chamber can be used as an interface to more sofisticated measurement systems such as a VSM magnetometer, AC Susceptometer…

Specifications

Maximum field: ±90kOe

Temperature range: 2K – 400K (some setups modify this range, see below for more information)

Measurement options

Resistivity

Resistivity

PPMS system is bundled with a current source and a voltmeter multiplexed to three channels that can determine the resistance of three samples quasi-simultaneously using four point measurement approach. Swithing between one sample and next is done automatically and cyclically several times per second.

Option can be used for the determination of the resistivity, magnetoresistance and Hall effect of the material under study. Its speficications allow the determination of resistances ranging from mOhm to approximmately 20MOhm

Sample rotator can be used with this option.

Specifications:

Current: 5nA to 5mA. DC current or square wave AC (plus/minus current)

Voltage limit: 0.1mV to 95mV

Power limit: 10nW to 1mW

AC Transport

AC Transport

AC Transport uses a waveform generator able to produce driving signals that are used by the current source to produce alternating currents. The bundled voltmeter measures the voltage and the measured signal is treated using a Lock-in based software.

Hardware is multiplexed to two channels, so that two samples can be measured during the same session.

Related software is prepared for measuring:

  • Sample resistivity
  • IV characteristics
  • Hall effect
  • Superconducting critical current

Sample rotator can be used with this option.

Specifications:

Amplitude range: 10uA to 2A

Frequency range: 10Hz to 10kHz

Voltmeter scale ranges: 40uV to 5V

ACMS

ACMS

With this option, PPMS can be used as a magnetometer. The option hardware provides the possibility to be used as DC extraction magnetometer or an AC Susceptometer.

Specifications:

Driving field amplitude: 0.1Oe to 15Oe

Frequency range: 10Hz to 10kHz

Working temperature range: 2K to 350K

Sensibility of DC extraction: 1e-5 emu

Sensibility of AC susceptibility: 1e-8 emu

VSM

VSM

VSM based magnetometers provide a fast and precise method for the determination of the DC magnetization of a material. An specially built sample holder that contains a heater allows to extend the working temperature up to 1000K.

Specifications:

Sensibility: 1e-6 emu

Temperature range: 2K to 300K for normal measurements, 300K to 1000K is oven sample holder is used

Torque

Torque

The measurement of the magnetic torque provides an alternate system for determining the sample magnetization. The main purpose of the magnetic torque measurement is to study the mangetic anysotropy of a material.