Spin Dynamics of the Spin-Ladder Dimer-Chain MaterialSr14Cu24O41

Abstract

We have performed inelastic neutron scattering on a single crystal sample of Sr 14 Cu 24 O 41 to study the spin dynamics of the Cu 2 O 3 spin ladder layers, and CuO 2 chains. Data collected with incident energies of 50 meV, 200 meV, 350 meV and 500 meV are best fitted with a dispersion with a spin gap of 32.5±0.1 meV and a maximum of 193.5±2.4 meV, consistent with a coupling along the ladders, J || = 130 meV and a rung coupling J ⊥ =72 meV. We find that excitations with an energy transfer of approximately 11.5 meV can be described solely in terms of a dimer chain with an antiferromagnetic intra-dimer coupling, J 1 = 11.2 meV, between next-nearest-neighbour Cu ions and a ferromagnetic inter-dimer coupling, J 2 = -1.1 meV. The dimers are separated by two Cu ions providing a periodicity for the dimer chain of five units.

Synthesis, structure and properties of Pb2CuB2O6

“…For example, cuprate compounds such as SrCu 2 O 3 [1,2], Sr 14 Cu 24 O 41 [3], and La 4 Cu 3 MoO 12 [4,5] have attracted attention because of their unusual low-temperature magnetic properties. Cuprate and borate groups are two-dimensional spin gap systems with the exact dimer ground state [6][7][8].…”

Magnetic dimerization in the frustrated spin ladder Li2Cu2O(SO4)2

“…Whereas SrCu 2 O 3 [8] or Sr 14 Cu 24 O 41 [9,10] are prototypical realizations of nonfrustrated ladders, BiCu 2 PO 6 [11] might appear as one of the very rare examples of S = 1/2 frustrated spin ladder where the frustration arises only from NNN interactions along the legs [12].…”

Low-temperature heat transport of spin-gapped quantum magnets

“…Both spin ladders and chains extend in the c direction. A large spin gap in the ladders of the order of 400 K was observed in this system [14,[49][50][51]. Figure 3 shows the thermal conductivity of Sr 14 Cu 24 O 41 as a function of temperature measured along the three crystallographic axes [44].…”

“…The typical two-leg S = 1/2 spin-ladder material, (Sr,Ca,La) 14 Cu 24 O 41 , has been found to display a ballistic spin-mediated transport [43][44][45][46][47][48]. (Sr,Ca,La) 14 Cu 24 O 41 is often called telephone-number compound because of the six digits in the chemical formula.…”

“…(Sr,Ca,La) 14 Cu 24 O 41 is often called telephone-number compound because of the six digits in the chemical formula. Both spin ladders and chains extend in the c direction.…”