Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-08-20
Phys. Rev. B 78, 184410 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 7 figures
Scientific paper
10.1103/PhysRevB.78.184410
SrEr$_2$O$_4$ has been characterised by low-temperature powder neutron diffraction, as well as single crystal specific heat and magnetisation measurements. Magnetisation measurements show that the magnetic system is highly anisotropic at temperature above ordering. A magnetic field of 280 kOe applied at $T=1.6$ K does not overcome the anisotropic magnetisation and fails to fully saturate the system. Long range antiferromagnetic ordering develops below $T_N=0.75$ K, identified by magnetic Bragg reflections with propagation vector ${\bf k}=0$ and a lambda anomaly in the specific heat. The magnetic structure consists of ferromagnetic chains running along the \textit{c} axis, two adjacent chains being stacked antiferromagnetically. The moments point along the \textit{c} direction, but only one of the two crystallographically in-equivalent Er sites has a sizeable ordered magnetic moment, 4.5 $\rm \mu_B$ at 0.55 K. The magnetic properties of SrEr$_2$O$_4$ are discussed in terms of the interplay between the low-dimensionality, competing exchange interactions, dipolar interactions and low lying crystal field levels.
Balakrishnan Ganesh
Brion Sophie de
Chapon Laurent C.
Petrenko Oleg A.
Suard Emmanuelle
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