X-ray and neutron diffraction studies of coupled structural phase transitions in DyBaCo$_{2}$O$_{5.5}$

Details X-ray and neutron diffraction studies of coupled structural phase transitions in DyBaCo$_{2}$O$_{5.5}$ X-ray and neutron diffraction studies of coupled structural phase transitions in DyBaCo$_{2}$O$_{5.5}$

2006-12-06

arxiv.org/abs/cond-mat/0612139v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures

Scientific paper

A structural transition at $T\approx 322$ K from the $Pmmm$ to $Pmma$ phase is found to coincide with an anomaly of resistivity. Another structural phase transition doubling the lattice parameter $c$, which has been postulated earlier to accompany a low-temperature magnetic transition in TbBaCo$_{2}$O$_{5.5}$, is observed in a single crystal DbBaCo$_{2}$O$_{5.5}$ by means of the X-ray and neutron diffraction. The low temperature phase does not belong to the space group $Pcca$ that has been chosen earlier as the highest subgroup of the $Pmma$. The transition is of the first order with the temperature hysteresis, between $T\approx 100$ and $T\approx 200$ K, which probably explains anomalous magnetic properties in this temperature range.

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