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Crystal and magnetic structure of antiferromagnetic HoAuGe
| Content Provider | Scilit |
|---|---|
| Author | Gibson, B. J. Pöttgen, R. Schnelle, W. Ouladdiaf, B. Kremer, R. K. |
| Copyright Year | 2001 |
| Description | Journal: Journal of Physics: Condensed Matter HoAuGe was prepared from the elements by arc melting and subsequent annealing at 1070 K. Its crystal structure was refined from single-crystal x-ray diffractometer data: a = 440.10(5) pm, c = 723.26(9) pm, V = 0.1213(1) $nm^{3}$, wR2 = 0.0640, 225 $F^{2}$-values and ten variables. The nuclear structure was confirmed by neutron powder diffraction. HoAuGe adopts the NdPtSb-type structure. The gold and germanium atoms form two-dimensional infinite [AuGe] polyanions with intralayer Au-Ge distances of 260.5 pm, while the interlayer Au-Ge distances of 304.1 pm are much longer. The polyanions are separated by the holmium ions. Magnetic susceptibility, specific heat capacity and neutron diffraction measurements reveal antiferromagnetic ordering at $T_{N}$ = 5.6(2) K with further magnetic reordering at $T_{1}$ = 3.5(2) K and $T_{2}$ = 2.4(2) K. At higher temperatures Curie-Weiss behaviour is observed with µ_{eff}$^{exp}$ = 10.2(2) $µ_{B}$ and $Θ_{p}$ = 0(1) K. From the magnetic specific heat a fourfold-degenerate ground state is found. The magnetic structure at 1.3 K is described by the propagation vector = (1/2,0,0) with the Ho spins oriented within the bc-plane. As the temperature increases towards $T_{N}$, the magnetic structure becomes incommensurate, which accounts for the observed additional transitions below $T_{N}$. |
| Related Links | http://iopscience.iop.org/article/10.1088/0953-8984/13/11/315/pdf |
| Ending Page | 2606 |
| Page Count | 14 |
| Starting Page | 2593 |
| ISSN | 09538984 |
| e-ISSN | 1361648X |
| DOI | 10.1088/0953-8984/13/11/315 |
| Journal | Journal of Physics: Condensed Matter |
| Issue Number | 11 |
| Volume Number | 13 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2001-03-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Physics: Condensed Matter Characterization and Testing of Materials X Ray Diffractometer Magnetic Susceptibility Powder Diffraction Neutron Diffraction Magnetic Structure Crystal Structure Single Crystal Specific Heat Nuclear Structure Ground State |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Materials Science |
