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We note here the caveat that should be borne in mind for all types of thermodynamic integration; caution should be exercised if the path of integration passes through regions of thermodynamically unstable states or if the thermally averaged integrand (stress, in the present case) is a discontinuous function of the integration variable (strain). The results we present show that the thermally averaged stress tensor varies continuously along the Bain path, so that there is no indication of instabilities on the path. Furthermore, the correctness of Bain-path integration will be confirmed a posteriori by the fact that the free-energy differences deduced from it are corroborated by explicit calculation of the anharmonic free energies (see Sec. ).
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We note here the caveat that should be borne in mind for all types of thermodynamic integration; caution should be exercised if the path of integration passes through regions of thermodynamically unstable states or if the thermally averaged integrand (stress, in the present case) is a discontinuous function of the integration variable (strain). The results we present show that the thermally averaged stress tensor varies continuously along the Bain path, so that there is no indication of instabilities on the path. Furthermore, the correctness of Bain-path integration will be confirmed a posteriori by the fact that the free-energy differences deduced from it are corroborated by explicit calculation of the anharmonic free energies (see Sec.).
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We have also checked the effect on the fcc-bcc free energy difference when we reduce the PAW core radius. We reduced the core radius from 2.7 a.u. to 1.6 a.u. and we used first-order perturbation theory to estimate the changes of free energies of fcc and bcc at the state V=8.26 3/atom and T=9000 K. We found that these free energy changes amount to only ∼10 meV/atom, which is much smaller than our computed free energy differences between fcc and bcc.
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We have also checked the effect on the fcc-bcc free energy difference when we reduce the PAW core radius. We reduced the core radius from 2.7 a.u. to 1.6 a.u. and we used first-order perturbation theory to estimate the changes of free energies of fcc and bcc at the state V = 8.26 3 /atom and T = 9000 K. We found that these free energy changes amount to only ∼ 10 meV/atom, which is much smaller than our computed free energy differences between fcc and bcc.
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We note that the use of harmonic reference systems in calculating the free energy of anharmonic systems is very well established. A few of the many examples are, JCPSA6 0021-9606 10.1063/1.448024
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We note that the use of harmonic reference systems in calculating the free energy of anharmonic systems is very well established. A few of the many examples are D. Frenkel and A. J. C. Ladd, J. Chem. Phys. JCPSA6 0021-9606 10.1063/1.448024 81, 3188 (1984);
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This point was emphasised by the originators of the Z method, noting in Ref. 37 that "... in this method both a rather large number of atoms and long runs are needed... ".
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This point was emphasised by the originators of the Z method, noting in Ref. 37 that "... in this method both a rather large number of atoms and long runs are needed... ".
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