Document Detail

Iron under pressure: "kohn tweezers" and remnant magnetism.
MedLine Citation:
PMID:  21770592     Owner:  NLM     Status:  In-Data-Review    
In this work we investigate the magnetic and structural properties of bulk Fe and Fe nanoparticles under pressure with x-ray absorption and emission spectroscopies providing answers to two fundamental questions: (a) the chicken-or-egg problem for the magnetic and structural transitions and (b) magnetism in the high pressure hcp phase. The two transitions, inextricably linked in the bulk, are clearly decoupled in the nanoparticles, with the magnetic collapse preceding the structural transition. Ultrafast x-ray emission spectroscopy detects remnant magnetism, probably antiferromagnetic fluctuations, up to pressures of about 40 GPa in the hcp phase. This could be of direct relevance to the superconductivity in ϵ-Fe [K. Shimizu et al., Nature (London) 412, 316 (2001)] through the existence of a quantum critical point and associated magnetic fluctuations.
A Monza; A Meffre; F Baudelet; J-P Rueff; M d'Astuto; P Munsch; S Huotari; S Lachaize; B Chaudret; Abhay Shukla
Publication Detail:
Type:  Journal Article     Date:  2011-06-15
Journal Detail:
Title:  Physical review letters     Volume:  106     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-07-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  247201     Citation Subset:  IM    
Université Pierre et Marie Curie, IMPMC, CNRS UMR7590, 4 Place Jussieu, 75005 Paris, France and Synchrotron SOLEIL, L'Orme des Merisiers, BP-48 Saint-Aubin, 91192 Gif-sur-Yvette, France.
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