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.
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Multiple order Parameter Systems
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talk
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)
