Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB6

Magnetic Charge as a “Hidden” Gauge Symmetry

A theory containing both electric and magnetic charges is formulated using two vector potentials, A and C. This has the aesthetic advantage of treating electric and magnetic charge both as gauge symmetries, but it has the experimental disadvantage of introducing a second massless gauge boson (the “magnetic” photon) which is not observed. This problem is dealt with by using the Higgs mechanism t...

Spin exciton formation inside the hidden order phase of CeB6.

The heavy fermion metal CeB(6) exhibits a hidden order of the antiferroquadrupolar (AFQ) type below T(Q)=3.2 K and a subsequent antiferromagnetic (AFM) order at T(N)=2.3 K. It was interpreted as an ordering of the quadrupole and dipole moments of a Γ(8) quartet of localized Ce 4f(1) electrons. This established picture has been profoundly shaken by recent inelastic neutron scattering (G. Friemel...

Diamond as a magnetic field calibration probe

An optical method is proposed for the calibration of pulsed magnetic fields using photoluminescence from synthetic diamond. Generally, the pulsed magnetic field profile is reconstructed by measuring the pick-up voltage in a small coil with an effective area that needs to be known accurately. A useful method to calibrate this area is presented using the 1.4040 eV optical transition at the 1.4 eV...

77Se NMR probe of magnetic excitations of the magic angle effect in (TMTSF)2PF6.

We report 77Se spin-lattice relaxation rates for (TMTSF)2PF6, carried out in the regime where a set of spectacular transport anomalies known as the "magic angle effects" are observed. In situ resistance measurements (R(zz)) were used to verify the experimental conditions and give precise sample alignment information. We found that the 77Se T-11 exhibits no significant changes as the magnetic-fi...

ELNES as a probe of magnetic order in mixed oxides