Magnetoelastic paradox: Absence of symmetry-breaking distortions below TN in antiferromagnetic systems without orbital moment

M. Rotter, A. Lindbaum, A. Barcza, M. El Massalami, M. Doerr, M. Loewenhaupt, H. Michor, B. Beuneu

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Phase transitions are often associated with symmetry breaking. In case of magnetic order time reversal symmetry is broken and this leads to magnetostriction. For magnetic systems without orbital moment (L = 0) the only source of magnetostriction is believed to be the exchange striction (ES). If the systems, for instance Gd3+-based compounds (S = 7/2, L = 0), order ferromagnetically (fm) no lattice distortions are expected from the standard model of rare-earth magnetism, whereas in the antiferromagnetically (afm) ordered compounds symmetry-breaking lattice distortions should occur. These latter prediction of the theory is in complete contrast to all available experimental data on Gd3+ antiferromagnets. They show in many cases large magnetostrictive effects, but no symmetry breaking. Thus we can formulate the "magnetoelastic paradox": in afm systems without orbital moment (L = 0) symmetry-breaking distortions below the Néel temperature are expected, but have not been found. New experimental data indicates, that the magnetoelastic paradox is only present in zero field and may be lifted by a small magnetic field.

Original languageEnglish
Pages (from-to)160-166
Number of pages7
JournalEurophysics Letters
Volume75
Issue number1
DOIs
Publication statusPublished - 1 Jul 2006
Externally publishedYes

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