Speaker
Dr
Cinthia Piamonteze
(Paul Scherrer Institut)
Description
The compound CuFeO2 has a delafossite structure where triangular layers of magnetic Fe3+ are separated by non-magnetic Cu1+ and O2- layers. CuFeO2 orders in a collinear four sublattice (4SL) structure below TN2=11K, with the magnetic moments along c. Associated with TN2 is a first order structural transition from hexagonal to orthorhombic. For temperature between TN1=14K and TN2 the system is in an incommensurate magnetic phase. One puzzling question about this system concerns its strong magnetic anisotropy observed. Fe3+ (d5), which is the only magnetic ion in the system, has a spin only ground state, so no anisotropy is expected. That motivated us to use x-ray magnetic circular dichroism (XMCD) probing separately the orbital and spin moments of the Fe3+ ions. In this work we present our XMCD data on Fe L-edges as a function of temperature revealing how the spin and orbital moments vary across the phase transition in CuFeO2. These results are discussed in the context to the observed magnetic anisotropy.
Please specify poster or talk
talk
Please specify the session
Multiple order Parameter Systems
Primary author
Dr
Cinthia Piamonteze
(Paul Scherrer Institut)
Co-authors
Arantxa Fraile Rodriguez
(Departament de Física Fonamental and Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona)
Prof.
Frithjof Nolting
(Paul Scherrer Institut)
Prof.
Harald Brune
(Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fe´de´rale de Lausanne)
Dr
Jan Dreier
(Paul Scherrer Institut)
Noriki Terada
(National Institute for Materials Science)
Dr
Stefano Rusponi
(Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fe´de´rale de Lausanne)
Dr
Urs Staub
(Paul Scherrer Institut)
