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What is the purpose of the external magnetic fields?

April 26, 2017external magnetic fields purpose

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What is the purpose of the external magnetic fields?

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By default, the global field bfieldc and the individual muffin-tin fields bfcmt are added to the second variational Hamiltonian only as a means of breaking spin symmetry. These fields are considered infinitesimal and their associated energy is not added to the total. Therefore they should be made only as large as is required to break spin symmetry.