Absence of anomalous negative lattice-expansion for polycrystalline sample of Tb2Ti2O7

Details Absence of anomalous negative lattice-expansion for polycrystalline sample of Tb2Ti2O7 Absence of anomalous negative lattice-expansion for polycrystalline sample of Tb2Ti2O7

2011-09-09

arxiv.org/abs/1109.1980v3

J. Phys. Soc. Jpn. 81, 015001 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 3 figures

Scientific paper

10.1143/JPSJ.81.015001

High resolution X-ray powder-diffraction experiments on a well-characterized polycrystalline sample of the spin liquid Tb2Ti2O7 reveal that it shows normal positive thermal-expansion above 4 K, which does not agree with the intriguing anomalous negative thermal-expansion due to a magneto-elastic coupling reported for a single crystal sample below 20 K. We also performed a Rietveld profile refinement of a powder-diffraction pattern taken at a room temperature, and confirmed that it is consistent with the fully ordered cubic pyrochlore structure.

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