Magnetic and lattice coupling in single-crystal SrFe2 As2: A neutron scattering study

Haifeng Li, Wei Tian, Jerel L. Zarestky, Andreas Kreyssig, Ni Ni, Sergey L. Bud'Ko, Paul C. Canfield, Alan I. Goldman, Robert J. McQueeney, David Vaknin

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

A detailed elastic neutron scattering study of the structural and magnetic phase transitions in single-crystal SrFe2 As2 reveals that the orthorhombic (O)-tetragonal (T) and the antiferromagnetic transitions coincide at TO = TN = (201.5±0.25) K. The observation of coexisting O-T phases over a finite temperature range at the transition and the sudden onset of the O distortion provide strong evidences that the structural transition is first order. The simultaneous appearance and disappearance within 0.5 K upon cooling and within 0.25 K upon warming, respectively, indicate that the magnetic and structural transitions are intimately coupled. We find that the hysteresis in the transition temperature extends over a 1-2 K range. Based on the observation of a remnant orthorhombic phase at temperatures higher than TO, we suggest that the T-O transition may be an order-disorder transition.

Original languageEnglish
Article number054407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number5
DOIs
StatePublished - Aug 13 2009
Externally publishedYes

Fingerprint

Dive into the research topics of 'Magnetic and lattice coupling in single-crystal SrFe2 As2: A neutron scattering study'. Together they form a unique fingerprint.

Cite this