Magneto-chemical studies with a new ultrasensitive superconducting quantum magnetometer

TL;DRAbstract

A magnetometer utilizing quantum superconductivity
\nas the basis for the flux sensor element
\nhas been designed and used for biochemical susceptibility
\nmeasurements in the temperature range
\nfrom 1.5°K to 300°K. The sensitivity and reproducibility
\nof this instrument have been tested by
\nmeasurements on small amounts of material of well-known
\nsusceptibilities. Using this instrument the
\ntemperature dependence of the magnetic susceptibilities
\nof oxy- and metaquohemerythrin have been
\nmeasured and for the first time their anti-ferromagnetic
\ncomponents have been unambigiously resolved.
\nFrom this data the exchange coupling
\nconstants between the two high-spin iron (III)
\natoms in each subunit have been determined to be
\n-77 and -134 cm^(-1) respectively.

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