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

Yu. P. Chernenkov; V. P. Plakhty; A. G. Gukasov; S. N. Barilo; S. V. Shiryaev; G. L. Bychkov; V. Hinkov; V. I. Fedorov; V. A. Chekanov

doi:10.1016/j.physleta.2006.12.067

paper

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

arXiv:cond-mat/0612139 · doi:10.1016/j.physleta.2006.12.067

Abstract

A structural transition at $T \approx 322$ K from the $P mmm$ to $P mma$ 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 $P cc a$ that has been chosen earlier as the highest subgroup of the $P mma$ . 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.

6 pages, 4 figures

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

Abstract

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X-ray and neutron diffraction studies of coupled structural phase transitions in DyBaCo2​O5.5​

Abstract

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