Chain Formation by Spin Pentamers in eta-Na9V14O35

Details Chain Formation by Spin Pentamers in eta-Na9V14O35 Chain Formation by Spin Pentamers in eta-Na9V14O35

2008-09-03

arxiv.org/abs/0809.0619v1

Europhysics Letters 83, 67002 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures

Scientific paper

10.1209/0295-5075/83/67002

The nature of the gapped ground state in the quasi-one-dimensional compound eta-Na9V14O35 cannot easily be understood, if one takes into account the odd number of spins on each structural element. Combining the results of specific heat, susceptibility and electron spin resonance measurements we show that eta-Na9V14O35 exhibits a novel ground state where multi-spin objects build up a linear chain. These objects - pentamers - consist of five antiferromagnetically arranged spins with effective spin 1/2. Their spatial extent results in an exchange constant along the chain direction comparable to the one in the high-temperature state.

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