PPMS
PPMS

(QuantumDesign, qdusa.com/products/ppms.html).

Samples are mounted on 2.3 cm diameter pucks that are inserted into the measuring chamber by rods and connected at the bottom of the dewar to the measuring systems. Samples can be, depending on the property in question, in the form of solids, powders and thin films. Small sample sizes (1-500 mg) are in general needed and temperature sweeps can be made at rates 0.01-6 K/min. Due to the cost of liquid He, the PPMS may not be in operation continuously but run in cycles.

Equipment at the department for preparation of samples for the PPMS include several blade saws, a wire saw and grinding/polishing machines.

Capabilities/Accessories

  • The basic magnetic measurement system provides for measurements of dc magnetization (M-H curves) for H ? 9 T and ac magnetization for fields 2 nOe-15 Oe and frequencies 10 Hz-10 kHz.
  • A 40 Hz vibrating sample magnetometer (VSM) enables high sensitivity magnetic susceptibility measurements.
  • The ac transport system has a precision current source and voltage detector that enables measurements of (i) dc and 1 Hz - 1 kHz ac resistivity (4-point and van der Pauw) in the range nΩ - kΩ, (ii) Hall effect, (iiii) I-V curves and (iv) super-conductor critical current and field.
  • The resistivity option adds a configurable resistance bridge board and enables measurements of dc and ac resistivity in the range Ω to MΩ.
  • The heat capacity system uses a two-tau model to remove the background heat capacity of the sample platform and has a resolution of 10 nJ/K at 2K.
  • The thermal transport system enables simultaneous measurements of (i) ac resistivity, (ii) thermal conductivity, (iii) Seebeck coefficient and (iv) figure-of-merit zT.

Example/Application areas

Hall coefficient

Hall coefficient for ZnSb heat-treated by spark plasma sintering at 410°C and 420°C.
Hall coefficient for ZnSb heat-treated by spark plasma sintering at 410°C and 420°C.
 

Thermal conductivity

Thermal conductivity of pure (green curve) and doped (orange curve) ZnSb.

Thermal conductivity of pure (green curve) and doped (orange curve) ZnSb.

Seebeck coefficient

Seebeck coefficient of pure (green curve) and doped (orange curve) ZnSb.
Seebeck coefficient of pure (green curve) and doped (orange curve) ZnSb.

Electronic conductivity

Electronic conductivity of pure (green curve) and doped (orange curve) ZnSb.
Electronic conductivity of pure (green curve) and doped (orange curve) ZnSb.

Magnetic susceptibility

Field cooled (upper curve) and zero field cooled magnetic susceptibility c for Sr0.25Pr0.75FeO3-d.
Field cooled (upper curve) and zero field cooled magnetic susceptibility c for Sr0.25Pr0.75FeO3-d.

Magnetization versus field

Magnetization M versus applied magnetic field H for Sr2.25Y0.75Fe1.25Ni0.75O6 at 100K.
Magnetization M versus applied magnetic field H for Sr2.25Y0.75Fe1.25Ni0.75O6 at 100K.
 
 
Diamond blade saw for sample preparation.
Diamond blade saw for sample preparation.
 
Wire saw for sample preparation.
Wire saw for sample preparation.
 

Recharge Rates

1750 SEK per day for all users.