Elastic neutron scattering of the "phase ordering" phase transition in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Hg</mi></mrow><mrow><mn>3</mn><mo>−</mo><mi>δ</mi></mrow></msub></mrow><mi mathvariant="normal">As</mi><mrow><msub><mrow><mi mathvariant="normal">F</mi></mrow><mrow><mn>6</mn></mrow></msub></mrow></math></span>

J. P. Pouget; G. Shirane; J. M. Hastings; A. J. Heeger; N. D. Miro; A. G. MacDiarmid

doi:10.1103/PhysRevB.18.3645

Elastic neutron scattering of the "phase ordering" phase transition in ${Hg}_{3 - δ} As F_{6}$

J. P. Pouget, G. Shirane, J. M. Hastings, A. J. Heeger, N. D. Miro, and A. G. MacDiarmid

Phys. Rev. B 18, 3645 – Published 1 October 1978

Abstract

Elastic-neutron-scattering experiments performed on the linear-chain mercury compound ${Hg}_{3 - δ} As F_{6}$ are presented. On cooling, a progressive phase ordering between the Hg chains, randomly phased at room temperature, has been found and characterized. Short-range order gradually builds up, with transverse coherence lengths of a few lattice constants, as a result of parallel chain-chain interactions. At 120 K, the competing orthogonal chain-chain interaction leads to three-dimensional order and a phase-ordering phase transition. The three-dimensional low-temperature phase is accompanied by an incommensurate modulation of the Hg chains indicating an interaction with the host lattice.

Received 16 May 1978

DOI:https://doi.org/10.1103/PhysRevB.18.3645

Authors & Affiliations

J. P. Pouget^*, G. Shirane, and J. M. Hastings

Brookhaven National Laboratory, Upton, New York 11973

A. J. Heeger^†, N. D. Miro^‡, and A. G. MacDiarmid^‡

Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104

^*Permanent address: Laboratoire de Physique des Solides, Associé au CNRS, Université Paris-Sud, 91405 Orsay, France.
^†Department Physics, University of Pennsylvania.
^‡Department of Chemistry, University of Pennsylvania.

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Vol. 18, Iss. 7 — 1 October 1978

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