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000172356 0247_ $$2doi$$a10.1103/PhysRevB.89.174431
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000172356 1001_ $$0P:(DE-Juel1)144543$$aNair, Harikrishnan$$b0$$eCorresponding Author$$ufzj
000172356 245__ $$aApproaching the true ground state of frustrated A-site spinels: A combined magnetization and polarized neutron scattering study
000172356 260__ $$aCollege Park, Md.$$bAPS$$c2014
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000172356 520__ $$aWe 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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000172356 7001_ $$0P:(DE-Juel1)130647$$aFu, Zhendong$$b1$$ufzj
000172356 7001_ $$0P:(DE-Juel1)131018$$aVoigt, Jörg$$b2$$ufzj
000172356 7001_ $$0P:(DE-Juel1)130991$$aSu, Yixi$$b3$$ufzj
000172356 7001_ $$0P:(DE-Juel1)130572$$aBrückel, Thomas$$b4$$ufzj
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