TY - JOUR
T1 - Anomalous magnetization cycle of UFe4Al8 single crystals: A Mössbauer effect study
AU - Waerenborgh, João C.
AU - Gonçalves, António P.
AU - Bonfait, Grégoire
AU - Godinho, Margarida
AU - Almeida, Manuel
PY - 1999
Y1 - 1999
N2 - An 57Fe Mössbauer spectroscopy study was performed on an UFe4Al8 single crystal, in an external magnetic field Bext, subtending an angle of 11° at the b axis. It shows that, even in low fields, the configuration of the Fe magnetic moments, μFe, is consistent with the canted antiferromagnetic order of μFe, established by single-crystal neutron diffraction in a field of 4.6 T. The canting of μFe is always observed towards the direction of the U magnetic moments μU, clearly showing that it is induced by μU rather than by Bext. At a certain value of Bext during the magnetic domain rotation, the direction of μFe is found to be temporarily frozen approximately along the direction of Bext. This confirms previous magnetization and magnetoresistance data, which show that for the same values of Bext, μU is blocked perpendicularly to Bext. Furthermore, the present study reveals that this blocking is a metastable state with a relaxation time of a few hours, at 4.2 K.
AB - An 57Fe Mössbauer spectroscopy study was performed on an UFe4Al8 single crystal, in an external magnetic field Bext, subtending an angle of 11° at the b axis. It shows that, even in low fields, the configuration of the Fe magnetic moments, μFe, is consistent with the canted antiferromagnetic order of μFe, established by single-crystal neutron diffraction in a field of 4.6 T. The canting of μFe is always observed towards the direction of the U magnetic moments μU, clearly showing that it is induced by μU rather than by Bext. At a certain value of Bext during the magnetic domain rotation, the direction of μFe is found to be temporarily frozen approximately along the direction of Bext. This confirms previous magnetization and magnetoresistance data, which show that for the same values of Bext, μU is blocked perpendicularly to Bext. Furthermore, the present study reveals that this blocking is a metastable state with a relaxation time of a few hours, at 4.2 K.
UR - http://www.scopus.com/inward/record.url?scp=0000085374&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.60.4074
DO - 10.1103/PhysRevB.60.4074
M3 - Article
AN - SCOPUS:0000085374
SN - 0163-1829
VL - 60
SP - 4074
EP - 4081
JO - Physical Review B - Condensed Matter And Materials Physics
JF - Physical Review B - Condensed Matter And Materials Physics
IS - 6
ER -