Abstract
The static magnetic field induced magnetisation densities of two uranium based heavy-fermion systems have been determined in spin polarised neutron scattering experiments at temperatures of T = 5 K and T = 10 K, respectively. Both compounds show a significantly different magnetisation density. The various contributions are identified. In UPt 3 the polarisation of conduction electrons is important, but in contrast the magnetisation density in UBe 13 is observed to be of a pure uranium 5f-electron character with no indication of any conduction electron contribution due to polarization by the external magnetic field. Both heavy-fermion compounds have in common a small value of the aligned 5f-electron magnetic moment which is well described by a spherically symmetric model. However, UPt 3 and UBe 13 differ significantly in the contributions of the conductions electrons.
Highlights
The various known heavy-fermion systems exhibit a variety of ground states: superconducting, magnetic as well as nonsuperconducting and nonmagnetic states at lowest temperatures
The limited number of measured points [4] resulted in an incomplete data set and a pure uranium Sf-electron explanation was put forward by Stassis and coworkers for the magnetisation density in UPt, and UBe
While in UPt, the conduction electrons are found to be of importance, the experimental evidence for UBe, indicates the absence of any non uranium Sf-electron magnetisation
Summary
A comparison of the static magnetic field induced magnetisation densities in UPt, and UBe 13. The static magnetic field induced magnetisation densities of two uranium based heavy-fermion systems have been determined in spin polarised neutron scattering experiments at temperatures of T = 5 K and T = 10 K, respectively. Both compounds show a significantly different magnetisation density. In UPt, the polarisation of conduction electrons is important, but in contrast the magnetisation density in UBe,, is observed to be of a pure uranium Sf-electron character with no indication of any conduction electron contribution due to polarization by the external magnetic field Both heavy-fermion compounds have in common a small value of the aligned .5f-electron magnetic moment which is well described by a spherically symmetric model. UPt, and UBe,, differ significantly in the contributions of the conductions electrons
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