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Diamond Anvils for electrical transport measurements

Electrical transport experiments play a key role in the study of many interesting high pressure phenomena, including pressure-induced superconductivity, insulator-to-metal transitions, and quantum critical behaviour. High-pressure electrical transport experiments also play an important function in geophysics and Earth’s interior studies.

However, such measurements in a diamond anvil cell (DAC) have been very challenging with several different 'recipes' being adopted with various degrees of success. Almax easyLab offers diamond anvils with deposited gold patterns for electrical transport measurements in a DAC. Our patterned diamond anvils significantly facilitate such experiments.

Almax easyLab's patterned anvils together with the Diacell® ChicagoDAC or Diacell®CryoDAC-PPMS enable seamless transport measurements at extreme conditions.

Patterned Anvils

Diamond anvils with sputtered gold metal probes.

The Almax easyLab patterned anvils are ideal for transport and other electrical measurements in a diamond anvil cell.
As the 4 metal probes are not embedded, these patterned anvils still require gasket insulation and can be used at moderate high pressure only (up to 10 – 20 Gpa). Electrical contact between the sample and the conductive patterns on the diamond anvil can be made in a variety of ways, such as with silver epoxy, silver paint and even soft solder.

There are two configurations readily available:
C = 0.40 mm approx., Cb = 0.45 mm approx. at 8º with probe inter-distance of 100 µm approx.
C = 0.80 mm approx., Cb = 0.85 mm approx. at 8º with probe inter-distance of 200 µm approx.

Almax easyLab patterned diamond anvils are reusable even after many pressure runs.

Typical data that can be obtained with a DAC equipped with our patterned diamond anvils is shown below. The first graph shows data on a sample of lead up to 8 GPa. The resistance as a function of temperature and pressure (measured using ruby fluorescence) clearly shows the onset of the superconducting transitions.

The graph below shows the resistance of bismuth at room temperature at pressures up to above 10 GPa (also measured with ruby). The pressure-induced structural transitions are visible in the data. The observed effect of higher resistance on unloading is attributed to non-hydrostatic conditions in the sample chamber, as no pressure medium was used in this study.

Pictures of samples mounted on patterned diamond anvils and data graphs displayed above are courtesy of D.Braithwaite (CEA) and J.Hamlin (UF).

If you are interested in Almax easyLab patterned anvils or require more details, please do not hesitate to contact us.