Magnetic resonance in cerium hexaboride caused by quadrupolar ordering

TL;DR

This paper reports experimental evidence of magnetic resonance in CeB6's antiferro-quadrupole phase, revealing a new magnetic contribution from localized moments below orbital ordering temperature, challenging existing dense Kondo system expectations.

Contribution

It provides experimental evidence of magnetic resonance linked to quadrupolar ordering in CeB6 and discusses the need for a new theory to explain these magnetic properties.

Findings

Emergence of magnetic resonance below orbital ordering temperature

Localized magnetic moments contribute to the resonance

Challenges existing dense Kondo system models

Abstract

Experimental evidence of the magnetic resonance in the antiferro-quadrupole phase of CeB6 is reported. We have shown that below orbital ordering temperature a new magnetic contribution from localized magnetic moments (LMM) emerge and gives rise to observed resonant phenomenon. This behaviour is hardly possible to expect in dense Kondo system, where LMM should vanish al low temperatures rather than emerge. From the other hand, in the quadrupole ordering concept, where magnetism of Ce magnetic ions is solely accounted, is difficult to explain splitting of magnetisation into components having different physical nature. Therefore an adequate theory explaining magnetic properties of CeB6 including magnetic resonance and orbital ordering appears on the agenda.