Antiferromagnetism with divalent Eu in EuNi5As3

Abstract

We have successfully synthesized single crystals of EuNi5As3 using a flux method and we present a comprehensive study of the physical properties using magnetic susceptibility, specific heat, electrical resistivity, thermoelectric power and x-ray absorption spectroscopy (XAS) measurements. EuNi5As3 undergoes two close antiferromagnetic transitions at respective temperatures of TN1 = 7.2 K and TN2 = 6.4 K, which are associated with the Eu 2+ moments. Both transitions are suppressed upon applying a field and we map the temperature-field phase diagrams for fields applied parallel and perpendicular to the easy a axis. XAS measurements reveal that the Eu is strongly divalent, with very little temperature dependence, indicating the localized Eu 2+ nature of EuNi5As3, with a lack of evidence for heavy fermion behavior.

Dyonic Lieb-Schultz-Mattis theorem and symmetry protected topological phases in decorated dimer models

“…We will soon show that the resulting phase is an SPT phase, which is exactly a realization of the anyon condensation mechanism to obtain SPT phases proposed in Ref. 21. In fact, if we start from the decoupling limit with λ = 0 and gradually increase λ with all other couplings fixed, we should be able to see two phases: an SET phase with spinon carrying S z = 1/2 when λ small and an SPT phase resulting from the condensation of Ising-odd visons when λ is in the parameter regime J z λ J ⊥ , h and h 2 λ 2 J ⊥ Jz .…”

“…The m particle, bound to a g charge that sees the magnetic flux, forms a composite object that may condense uniformly and confine the topological order. At the same time, this leads to an SPT phase since the condensing anyon carries nontrivial symmetry charge 21,22 . Indeed this picture will allows us to construct models of such LSM enforced SPT phases as we describe below.…”

“…This identification implies that we have condensed the composite of magnetic flux and symmetry charge. The resulting confined phase is potentially an SPT if the electric charges are associated with the appropriate symmetry fractionalization 21,22 . However, to obtain an LSM enforced SPTs the situation is different since they involve fractional spin on the sites.…”

Filling-enforced constraint on the quantized Hall conductivity on a periodic lattice

“…Starting one particular ground state with a well-efined expectation value U 1 , Eq. (45) implies that we can generate another ground state which has the total polarization P 1 different from the original ground state by…”

“…However, conceptually one still can accept the existence of Ω g satisfying 90 quite generally (as long as g is not changing the anyon types or superselection sectors). In fact, Ω g for (magnetic) translational symmetries can be microscopically constructed if one employs certain formulations such as tensor-network or parton methods [45]. Below we assume that ∀g in the magnetic translation symmetry group, Ω g exists and they satisfy Eq.(90).…”