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Title: Classical, quantum, and thermodynamics of a lattice model exhibiting structural negative thermal expansion

Journal Article · · Physical Review. B

We consider in detail a simple model supporting a single floppy mode that is often used to heuristically describe instances of negative thermal expansion. A key result is that the translational kinetic energy of the dilating bond network scales extensively with system size and results in dynamical properties which differ qualitatively from considerations built upon harmonic models. We develop an analogy between the dynamics of this model and a modified mechanical pendulum to elucidate the connection between the new results and the familiar harmonic limit. We then propose an appropriate Schrödinger equation for this system and study numerically the quantum mechanical solutions. Marked differences from conventional phonon dynamics and thermodynamics are seen in both classical and quantum limits, in particular a strong twofold enhancement of the (negative) coefficient of thermal expansion. We contextualize the results against real material parameters and discuss related empirical observations.

Research Organization:
Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016481
OSTI ID:
1535865
Alternate ID(s):
OSTI ID: 1346580
Journal Information:
Physical Review. B, Vol. 95, Issue 9; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (4)

Molecular dynamics simulation of zirconium tungstate amorphization and the amorphous-crystalline interface journal November 2019
Negative thermal expansion near two structural quantum phase transitions journal December 2017
Entropic elasticity and negative thermal expansion in a simple cubic crystal journal November 2019
Entropic elasticity and negative thermal expansion in a simple cubic crystal text January 2019