Orbital order-disorder transition with volume collapse in HoBaCo{sub 2}O{sub 5.5}: A high-resolution neutron diffraction study
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Laboratory for Developments and Methods, PSI, 5232 Villigen (Switzerland)
- Laboratory for Neutron Scattering, ETHZ and PSI, 5232 Villigen (Switzerland)
The crystal structure of the layered cobaltite HoBaCo{sub 2}O{sub 5.5} (substituted with both {sup 16}O and {sup 18}O) was studied across an insulator to metal (MI) transition at T{sub MI}=305 K employing high-resolution neutron diffraction. We have found that the transition at T{sub MI} is of the first-order type, accompanied by an abrupt negative change of the unit cell volume ({approx}0.15%) and melting of the orbital order in the pyramids. The existence of an isotope effect on T{sub MI} suggests that the structure changes are caused by the electron delocalization above the transition.
- OSTI ID:
- 20787998
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 11; Other Information: DOI: 10.1103/PhysRevB.73.113105; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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