Na4Ir3O8 as a 3D spin liquid with fermionic spinons

TL;DR

This paper investigates the spin liquid state in Na4Ir3O8, proposing a fermionic spinon Fermi surface at high temperatures and a paired state with line nodes below 20 K, highlighting novel quantum magnetic properties.

Contribution

It introduces a symmetry-based classification of flux states on a hyperkagome lattice and applies this to model Na4Ir3O8 as a 3D spin liquid with unique pairing characteristics.

Findings

High temperature state described by a spinon Fermi surface

Below 20 K, a paired state with line nodes forms

Discussion of mixed singlet and triplet pairing states

Abstract

Spin liquid states for spin-1/2 antiferromagnetic Heisenberg model on a hyperkagome lattice are studied. We classify and study flux states according to symmetries. Applying this model to Na4Ir3O8, we propose that the high temperature state may be described by a spinon Fermi surface, which forms a paired state with line nodes below 20 K. The possible mixed spin singlet and spin triplet pairing states are discussed according to the lattice symmetry which breaks inversion.