Ferromagnetism and Metamagnetism in Copper-doped Germanium Clathrate
Yang Li, Weiping Gou, Ji Chi, Joseph H. Ross
Abstract
Cu-doped type-I germanium clathrate can exhibit dilute magnetism, including ferromagnetism, antiferromagnetism, and metamagnetic transitions up to 90 K. 63Cu NMR measurements confirm that these transitions are due to a dilute composition of magnetic defects coupled by conduction electrons, behavior similar to that of magnetic semiconductors. Magnetic measurements indicate localized magnetic moments, attributed to clusters of magnetic ions, with competition between ferromagnetic and antiferromagnetic exchange, and also indications of glassy behavior in the ferromagnetic phase. NMR Knight shifts and relaxation times show that the conduction band is metallic with a large Korringa ratio. Comparison to a mean-field theory for the ordering behavior gives a good accounting for the ferromagnetic transition.
Create a lesson
Related papers
From picometre displacements to a three-dimensional lattice gas of polar skyrmions
Joohee Bang, Nives Strkalj, Hugo Aramberri et al.
Coherent and Incoherent Time-Resolved Diffuse Scattering Intensity from First Principles
Matteo Furci, Giovanni Marini, Stefano Mocatti et al.
VoroTypes: automated enumeration of Voronoi cell topologies for structural identification of complex crystals in atomistic simulations
Emanuel A. Lazar, Chris H. Rycroft
Large in-plane optical anisotropy in epitaxial CrN(113) films
Duc V. Dinh, Frank Peiris, Oliver Brandt
Coexistence of Altermagnetic and Compensated Ferrimagnetic Motifs in a Noncollinear Multiferroic
Vikrant Chaudhary, Fu Li, Hui Liu et al.
Low magnon damping of a EuSe film down to millikelvin temperatures
Rostyslav O. Serha, Jan Hofer, Khrystyna O. Levchenko et al.