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http://hdl.handle.net/1842/665
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| Title: | Magnetic cluster excitations in the antiferromagnetic phase of a-MnMoO4 |
| Authors: | Ochsenbein, Stefan T
Chaboussant, Gregory
Sieber, Andreas
Gudel, Hans U
Janssen, Stefan
Furrer, Albert
Attfield, J. Paul |
| Issue Date: | 2003 |
| Citation: | Magnetic cluster excitations in the antiferromagnetic phase of a-MnMoO4. Ochsenbein, S. T.; Chaboussant, G.; Sieber, A.; Gudel, H. U.; Janssen, S.; Furrer, A.; Attfield, J. P. Physical Review B: Condensed Matter and Materials Physics (2003), 68(9), 092410/1-092410/4. |
| Publisher: | © 2003 The American Physical Society |
| Abstract: | The tetramer-based compound a-MnMoO4 exhibits four prominent peaks in the inelastic neutron scattering
(INS) spectrum between 0.5 and 2.0 meV below 10 K. They are assigned to magnetic excitations of the
(Mn2+)4 rhombus shaped cluster, with resulting values of the exchange parameters J= +0.051 meV and J= -0.019 meV along the edges and the short diagonal, respectively. The interactions within the tetramer are
treated exactly in an isotropic quantum mechanical model leading to an S510 cluster ground state. The weaker
antiferromagnetic (AFM) intercluster interactions, Jint = -4.5*10-3 meV, are treated in a molecular-field
model below the AFM transition temperature TN= 10.7 K. INS and susceptibility are in quantitative agreement
with this approach. |
| Keywords: | Magnetic cluster |
| URI: | DOI: 10.1103/PhysRevB.68.092410
http://hdl.handle.net/1842/665 |
| Appears in Collections: | Chemistry publications
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