Magnetic polarization of Ir in underdoped nonsuperconducting Eu(Fe0.94Ir0.06)2As2

DOI: 10.1103/PhysRevB.93.024517

Authors: W. T. Jin (Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI) , Y. Xiao (Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI) , Y. Su (Jülich Centre for Neutron Science JCNS at Heinz Maier-Leibnitz Zentrum (MLZ)) , S. Nandi (Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI) , W. H. Jiao (Zhejiang University of Science and Technology) , Gareth Nisbet (Diamond Light Source) , S. Demirdis (Jülich Centre for Neutron Science JCNS at Heinz Maier-Leibnitz Zentrum (MLZ)) , G. H. Cao (Zhejiang University) , Th. Brückel (Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 93 (2)

State: Published (Approved)
Published: January 2016

Abstract: Using polarized neutron diffraction and x-ray resonant magnetic scattering (XRMS) techniques, multiple phase transitions were revealed in an underdoped, nonsuperconducting Eu(Fe1−xIrx)2As2 (x=0.06) single crystal. Compared with the parent compound EuFe2As2, the tetragonal-to-orthorhombic structural phase transition and the antiferromagnetic order of the Fe2+ moments are significantly suppressed to TS=111(2) K and TN,Fe=85(2) K by 6% Ir doping, respectively. In addition, the Eu2+ spins order within the ab plane in the A-type antiferromagnetic structure similar to the parent compound. However, the order temperature is evidently suppressed to TN,Eu=16.0(5) K by Ir doping. Most strikingly, the XRMS measurements at the Ir L3 edge demonstrates that the Ir 5d states are also magnetically polarized, with the same propagation vector as the magnetic order of Fe. With TN,Ir=12.0(5) K, they feature a much lower onset temperature compared with TN,Fe. Our observation suggests that the magnetism of the Eu sublattice has a considerable effect on the magnetic nature of the 5d Ir dopant atoms and there exists a possible interplay between the localized Eu2+ moments and the conduction d electrons on the FeAs layers.

Journal Keywords: Phase transitions; Pnictides; Neutron diffraction

Subject Areas: Physics, Materials


Instruments: I16-Materials and Magnetism

Other Facilities: No proposal number, author contacted

Added On: 24/02/2016 16:49

Discipline Tags:

Quantum Materials Physics Magnetism Materials Science

Technical Tags:

Scattering