Back to Search
Start Over
Microscopic phase diagram of LaFeAsO single crystals under pressure
- Source :
- Phys. Rev. B 98, 174510 (2018)
- Publication Year :
- 2018
-
Abstract
- We investigated LaFeAsO single crystals by means of synchrotron M\"ossbauer spectroscopy under pressures up to 7.5 GPa and down to 13 K and provide a microscopic phase diagram. We found a continuous suppression of the magnetic hyperfine field with increasing pressure and it completely vanishes at $\sim$ 7.5 GPa which is in contrast to the behavior in polycrystalline samples where the magnetic order vanishes at $\sim$ 20 GPa. The different behavior of the polycrystalline samples might be due to As-vacancies. Our results are in qualitative agreement with density functional theory calculations where a reduction of the magnetic moment with increasing pressure was found. We found that among different samples at ambient pressure the magnetic phase transition temperature as well as the low-temperature magnetic hyperfine field decrease with increasing unit cell volume.<br />Comment: 6 pages, 6 figures
- Subjects :
- Condensed Matter - Superconductivity
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 98, 174510 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1808.06654
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.98.174510