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| Hauptseite > Publikationsdatenbank > Approaching the true ground state of frustrated A-site spinels: A combined magnetization and polarized neutron scattering study > print |
| Hauptseite > Publikationsdatenbank > Approaching the true ground state of frustrated A-site spinels: A combined magnetization and polarized neutron scattering study > print |
| 001 | 172356 | ||
| 005 | 20250129094213.0 | ||
| 024 | 7 | _ | |2 doi |a 10.1103/PhysRevB.89.174431 |
| 024 | 7 | _ | |2 Handle |a 2128/8085 |
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| 037 | _ | _ | |a FZJ-2014-05836 |
| 082 | _ | _ | |a 530 |
| 100 | 1 | _ | |0 P:(DE-Juel1)144543 |a Nair, Harikrishnan |b 0 |e Corresponding Author |u fzj |
| 245 | _ | _ | |a Approaching the true ground state of frustrated A-site spinels: A combined magnetization and polarized neutron scattering study |
| 260 | _ | _ | |a College Park, Md. |b APS |c 2014 |
| 336 | 7 | _ | |0 PUB:(DE-HGF)16 |2 PUB:(DE-HGF) |a Journal Article |b journal |m journal |s 1425891501_22815 |
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| 520 | _ | _ | |a We re-investigate the magnetically frustrated, diamond-lattice-antiferromagnet spinels FeAl2O4 and MnAl2O4 using magnetization measurements and diffuse scattering of polarized neutrons. In FeAl2O4, macroscopic measurements evidence a “cusp” in zero field-cooled susceptibility around 13 K. Dynamic magnetic susceptibility and memory effect experiments provide results that do not conform with a canonical spin-glass scenario in this material. Through polarized neutron-scattering studies, absence of long-range magnetic order down to 4 K is confirmed in FeAl2O4. By modeling the powder averaged differential magnetic neutron-scattering cross section, we estimate that the spin-spin correlations in this compound extend up to the third nearest-neighbor shell. The estimated value of the Landé g factor points towards orbital contributions from Fe2+. This is also supported by a Curie-Weiss analysis of the magnetic susceptibility. MnAl2O4, on the contrary, undergoes a magnetic phase transition into a long-range ordered state below ≈40 K, which is confirmed by macroscopic measurements and polarized neutron diffraction. However, the polarized neutron studies reveal the existence of prominent spin fluctuations co-existing with long-range antiferromagnetic order. The magnetic diffuse intensity suggests a similar short-range order as in FeAl2O4. Results of the present work support the importance of spin-spin correlations in understanding magnetic response of frustrated magnets like A-site spinels which have predominant short-range spin correlations reminiscent of the “spin-liquid” state. |
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