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Title: Negative thermal expansion near two structural quantum phase transitions

Abstract

Recent experimental work has revealed that the unusually strong, isotropic structural negative thermal expansion in cubic perovskite ionic insulator ScF3 occurs in excited states above a ground state tuned very near a structural quantum phase transition, posing a question of fundamental interest as to whether this special circumstance is related to the anomalous behavior. To test this hypothesis, we report an elastic and inelastic x-ray scattering study of a second system Hg2I2 also tuned near a structural quantum phase transition while retaining stoichiometric composition and high crystallinity. We find similar behavior and significant negative thermal expansion below 100 K for dimensions along the body-centered-tetragonal c axis, bolstering the connection between negative thermal expansion and zero-temperature structural transitions.We identify the common traits between these systems and propose a set of materials design principles that can guide discovery of newmaterials exhibiting negative thermal expansion

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1419964
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Materials; Journal Volume: 1; Journal Issue: 7
Country of Publication:
United States
Language:
English

Citation Formats

Occhialini, Connor A., Handunkanda, Sahan U., Said, Ayman, Trivedi, Sudhir, Guzmán-Verri, G. G., and Hancock, Jason N. Negative thermal expansion near two structural quantum phase transitions. United States: N. p., 2017. Web. doi:10.1103/PhysRevMaterials.1.070603.
Occhialini, Connor A., Handunkanda, Sahan U., Said, Ayman, Trivedi, Sudhir, Guzmán-Verri, G. G., & Hancock, Jason N. Negative thermal expansion near two structural quantum phase transitions. United States. doi:10.1103/PhysRevMaterials.1.070603.
Occhialini, Connor A., Handunkanda, Sahan U., Said, Ayman, Trivedi, Sudhir, Guzmán-Verri, G. G., and Hancock, Jason N. Fri . "Negative thermal expansion near two structural quantum phase transitions". United States. doi:10.1103/PhysRevMaterials.1.070603.
@article{osti_1419964,
title = {Negative thermal expansion near two structural quantum phase transitions},
author = {Occhialini, Connor A. and Handunkanda, Sahan U. and Said, Ayman and Trivedi, Sudhir and Guzmán-Verri, G. G. and Hancock, Jason N.},
abstractNote = {Recent experimental work has revealed that the unusually strong, isotropic structural negative thermal expansion in cubic perovskite ionic insulator ScF3 occurs in excited states above a ground state tuned very near a structural quantum phase transition, posing a question of fundamental interest as to whether this special circumstance is related to the anomalous behavior. To test this hypothesis, we report an elastic and inelastic x-ray scattering study of a second system Hg2I2 also tuned near a structural quantum phase transition while retaining stoichiometric composition and high crystallinity. We find similar behavior and significant negative thermal expansion below 100 K for dimensions along the body-centered-tetragonal c axis, bolstering the connection between negative thermal expansion and zero-temperature structural transitions.We identify the common traits between these systems and propose a set of materials design principles that can guide discovery of newmaterials exhibiting negative thermal expansion},
doi = {10.1103/PhysRevMaterials.1.070603},
journal = {Physical Review Materials},
number = 7,
volume = 1,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2017},
month = {Fri Dec 01 00:00:00 EST 2017}
}