Colossal magnetostriction and negative thermal expansion in the frustrated antiferromagnet ZnCr2Se4

Details Colossal magnetostriction and negative thermal expansion in the frustrated antiferromagnet ZnCr2Se4 Colossal magnetostriction and negative thermal expansion in the frustrated antiferromagnet ZnCr2Se4

2006-07-31

arxiv.org/abs/cond-mat/0607811v1

Physics

Condensed Matter

Materials Science

5 pages 4 figures

Scientific paper

A detailed investigation of ZnCr2Se4 is presented which is dominated by strong ferromagnetic exchange but orders antiferromagnetically at T_N = 21 K. Specific heat C and thermal expansion Delta L/L exhibit sharp first-order anomalies at the antiferromagnetic transition. T_N is strongly reduced and shifted to lower temperatures by external magnetic fields and finally is fully suppressed suggesting a field induced quantum critical behavior close to 60 kOe. Delta L/L(T) is unusually large and exhibits negative thermal expansion below 75 K down to T_N indicating strong frustration of the lattice. Magnetostriction Delta L/L(H) reveals colossal values (0.5x10^{-3}) comparable to giant magnetostriction materials. Electron-spin resonance, however, shows negligible spin-orbital coupling excluding orbitally induced Jahn-Teller distortions. The obtained results point to a spin-driven origin of the structural instability at T_N explained in terms of competing ferromagnetic and antiferromagnetic exchange interactions yielding strong bond frustration.

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