Fig. 1: Experimental setup and characterization of DPPH as a model 1D spin system.
From: Waveguide quantum electrodynamics at the onset of spin-spin correlations
a Sketch of the setup used in transmission experiments and image of the two molecular subspecies, A and B, present in the DPPH crystal structure31. b Product of the magnetic susceptibility χ times temperature, measured on a powdered DPPH sample from 0.3 K up to 100 K and for B = 0.1 T. The blue (gray) solid line is a fit with a model that considers the formation of antiferromagnetic dimers within sublattice A and then of spin chains (dimers) within sublattice B, as T decreases. The inset shows the correlation function between nearest neighbor spins estimated as \(\langle {S}_{i}^{x}{S}_{i+1}^{x}\rangle \simeq -| 1-\chi T/{C}_{{{\rm{B}}}}|\)44,45, where CB = 0.1536 emu K/mol Oe is the Curie constant of the B-type DPPH molecules. c Specific heat of DPPH measured from 0.3 K to 100 K at B = 0. The blue (gray) solid line are results calculated with the chain45 (dimer31) model for the magnetic contribution of spins in sub-lattice B.
