Abstract
Before revealing why the ac susceptibility technique is of particular importance in high pressure investigations, we would like first to briefly discuss the types of changes in the magnetic and superconducting properties which can occur when a solid is subjected to high pressures. The changes observed for the elemental solids across the periodic table are representative for all compounds and alloys. The only elemental solids which exhibit strong magnetic behavior, such as a Curie-law susceptibility or magnetic ordering, are solid oxygen, the 3d transition metals (Cr, Fe, Co, Ni), the 4f rare earth metals (Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb), and the heavy 5f actinides (Cm, Bk, Cf, Es, Fm, Md, No) [1]. An atomic orbital will contribute to strong forms of magnetism only if the orbital is partially filled and does not overlap or hybridize too extensively with the orbitals of neighboring atoms. This explains why the above elements with their relatively well localized 3d-, 4f-, and 5f-orbitals are strongly magnetic. The remaining elements exhibit only weak forms of magnetism such as Pauli paramagnetism, Van Vleck paramagnetism, and Larmor diamagnetism.
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Schilling, J.S., Diederichs, J., Klotz, S., Sieburger, R. (1991). Ac Susceptibility Studies of Superconducting Properties Under High Hydrostatic Pressure. In: Hein, R.A., Francavilla, T.L., Liebenberg, D.H. (eds) Magnetic Susceptibility of Superconductors and Other Spin Systems. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2379-0_5
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