Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Universal Geometric Frustration in Pyrochlores

Published

Author(s)

Benjamin A Trump, Syed M. Koohpayeh, Ken J. T. Livi, JiaJia Wen, Kathyrn Arpino, Quentin M. Ramasse, Rik Brydson, Mikhail Feygenson, H. Takeda, M. Takigawa, K. Kimura, S. Nakatsuji, Collin L. Broholm, T. M. McQueen

Abstract

We report on the structural details of Pr2Zr2O6O', La2Zr2O6O', and Yb2Ti2O6O' in the A2B2O6O' pyrochlore structure. X-ray and neutron powder diffraction indicate these materials are long-range ordered. On the local scale these materials appear to be disordered despite ideal stoichiometry, ideal cation-ordering, no lone pair-effects, and lack of magnetism (in La2Zr2O7); as evidenced by pair-distribution analysis and selected area electron diffraction at room temperature. High-resolution scanning transmission electron microscopy and 91Zr NQR indicate that this disorder is static and of order 0.1 Å. The magnitude and pattern for displacements is consistent with a β-cristobalite distortion, due to either an electronic (Jahn-Teller) effect or the size mismatch between A and B cations. The evidence for these distortions has significant implications for materials which crystallize in the pyrochlore structure.
Citation
Nature Communications
Volume
9
Issue
1

Keywords

Pyrochlore, geometric frustration, spin-liquid behavior, β-cristobalite, pair-distribution function, scanning transmission electron microscopy

Citation

, B. , , S. , T., K. , Wen, J. , Arpino, K. , , Q. , Brydson, R. , Feygenson, M. , Takeda, H. , Takigawa, M. , Kimura, K. , Nakatsuji, S. , , C. and , T. (2018), Universal Geometric Frustration in Pyrochlores, Nature Communications, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=922150 (Accessed November 30, 2023)
Created July 5, 2018, Updated August 29, 2018