Ab initio calculations of bulk moduli and comparison with experiment

R. Gaudoin and W. M. C. Foulkes
Phys. Rev. B 66, 052104 – Published 9 August 2002
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Abstract

Bulk moduli appear readily accessible in electronic structure calculations, but the calculated values are often substantially greater than experimental bulk moduli. This discrepancy is the result of an unfair comparison of calculated and experimental results: many workers ignored the zero-point and finite-temperature effects that are present in experiments but absent from most calculations. These effects can alter bulk moduli by up to 20%. We show how good approximations to the required corrections may be obtained with little effort. We also deal with the statistical errors and biases in quantities derived from the noisy energy-volume curves produced by quantum Monte Carlo simulations.

  • Received 8 November 2001

DOI:https://doi.org/10.1103/PhysRevB.66.052104

©2002 American Physical Society

Authors & Affiliations

R. Gaudoin and W. M. C. Foulkes

  • CMTH Group, Blackett Laboratory, Imperial College of Science, Technology and Medicine, Prince Consort Road, London SW7 2BZ, England

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Issue

Vol. 66, Iss. 5 — 1 August 2002

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