Possible superlattice formation in high-temperature treated carbonaceous MgB2 at elevated pressure

O. Tschauner, D. Errandonea, George Serghiou

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We report indications of a phase transition in carbonaceous MgB2 above 9 GPa at 300 K after stress relaxation by laser heating. The transition was detected using Raman spectroscopy and X-ray diffraction. The observed changes are consistent with a second-order structural transition involving a doubling of the unit cell along c and a reduction of the boron site symmetry. Moreover, the Raman spectra suggest a reduction in electron–phonon coupling in the slightly modified MgB2 structure consistent with the previously proposed topological transition in MgB2. However, further attributes including deviatoric stress, lattice defects, and compositional variation may play an important role in the observed phenomena.
Original languageEnglish
Pages (from-to)89-94
Number of pages6
JournalPhysica B: Condensed Matter
Volume371
Issue number1
DOIs
Publication statusPublished - 2006

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