Pressure-induced two-step spin transition with structural symmetry breaking: X-ray diffraction, magnetic, and Raman studies

Helena J. Shepherd, Sylvestre Bonnet, Philippe Guionneau, Salma Bedoui, Gaston Garbarino, William Nicolazzi, Azzedine Bousseksou, and Gábor Molnár
Phys. Rev. B 84, 144107 – Published 10 October 2011
PDFHTMLExport Citation

Abstract

We have used single-crystal x-ray diffraction, Raman spectroscopy, and magnetometry to investigate the effect of hydrostatic pressures up to 16 kbar on the molecular spin crossover complex [FeII(bapbpy)(NCS)2]. A stepped first-order transition from the high-spin (HS) to low-spin (LS) phase was observed upon compression of single-crystal samples. The intermediate phase (IP) is stable between 4 and 11 kbar at room temperature. This phase is characterized by supercell reflections and tripling of the c-axis of the unit cell (C2/c) due to the formation of a periodic [HS-LS-LS] structural motif, as seen in the thermal stepped transition. The pressure-temperature phase diagram reveals an anomalous increase of the thermal hysteresis widths with increasing pressure and the stabilization of the IP across the investigated P-T space.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 23 June 2011

DOI:https://doi.org/10.1103/PhysRevB.84.144107

©2011 American Physical Society

Authors & Affiliations

Helena J. Shepherd1,2, Sylvestre Bonnet3, Philippe Guionneau2, Salma Bedoui1, Gaston Garbarino4, William Nicolazzi1, Azzedine Bousseksou1, and Gábor Molnár1,*

  • 1Laboratoire de Chimie de Coordination, CNRS UPR-8241, and Université de Toulouse, UPS, INP, Toulouse, France
  • 2CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr A. Schweitzer, F-33608 Pessac, France
  • 3Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
  • 4European Synchrotron Radiation Facility (ESRF), BP 220, 6 Rue Jules Horowitz, 38043 Grenoble Cedex, France

  • *Corresponding author: gabor.molnar@lcc-toulouse.fr

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 84, Iss. 14 — 1 October 2011

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×