Spin-wave polarization in single domain uranium selenide

Abstract

Spin waves in ferromagnetic USe have been measured by inelastic neutron scattering. Previous measurements on a multidomain USe sample show that the spin wave branch has a zone center frequency of ≊9 THz, and that the spin waves are intrinsically broad. New measurements on a single domain sample show that, in addition, the spin wave is unpolarized. This behavior is unlike that of a classical ferromagnet, in which the polarization is transverse, but similar to behavior observed in some singlet ground state systems.

Light atom quantum oscillations in UC and US

“…The complex electronic structure of uranium leads to a wide variety of unusual and diverse behavior in the uranium salts UX (X = C, N, P, S, As, Se, Sb, Te, Bi), and therefore the materials in this family have been the subject of many past investigations characterizing their magnetic and vibrational properties [1][2][3][4][5][6][7][8][9][10]. The phonon spectra in the UX systems have been comprehensively studied, however there has been renewed interest in more detailed calculations of their vibrational properties as certain members of the family, including UN and UC, are under active consideration for next generation nuclear fuels [11][12][13].…”

“…The complex electronic structure of uranium leads to a wide variety of unusual and diverse behaviors in the uranium salts UX (X = C, N, P, S, As, Se, Sb, Te, and Bi), and therefore the materials in this family have been the subject of many past investigations characterizing their magnetic and vibrational properties [1][2][3][4][5][6][7][8][9][10][11][12].…”