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Chen, Peng,Holinsworth, Brian S.,O’Neal, Kenneth R.,Luo, Xuan,Topping, Craig V.,Cheong, Sang W.,Singleton, John,Choi, Eun S.,Musfeldt, Janice L. American Chemical Society 2018 Inorganic Chemistry Vol.57 No.20
<P>We bring together <I>ac</I> susceptibility and <I>dc</I> magnetization to uncover the rich magnetic field-temperature behavior of a series of rare earth indium oxides, RInO<SUB>3</SUB> (R = Tb, Dy, and Gd). The degree of frustration is much larger than expected, particularly in TbInO<SUB>3</SUB>, and the ground states are glasslike with antiferromagnetic tendencies. The activation energy for spin reorientation is low. Chemical substitution with Mn<SUP>3+</SUP> ions to form TbIn<SUB>1-<I>x</I></SUB>Mn<SUB><I>x</I></SUB>O<SUB>3</SUB> (<I>x</I> ≤ 0.01) relieves much of the frustration that characterizes the parent compound and slightly enhances the short-range antiferromagnetic order. The phase diagrams developed from this work reveal the rich competition between spin orders and provide an opportunity to compare the dynamics in the RInO<SUB>3</SUB> and Mn-substituted systems. These structure-property relations may be useful for understanding magnetism in other geometrically frustrated multiferroics.</P><P>We combined <I>dc</I> magnetization and <I>ac</I> susceptibility to reveal the rich magnetic field-temperature phase diagrams of a series of rare earth indium oxides. These systems sport high degrees of frustration as described by the frustration index, <I>F</I>, as well as glasslike slow magnetic relaxation in combination with antiferromagnetic tendencies. Structure−composition−property investigations reveal that both the choice of rare earth center as well as introduction of a paramagnetic impurity like Mn<SUP>3+</SUP> can control frustration in this new class of geometrically frustrated multiferroics.</P> [FIG OMISSION]</BR>
Size-dependent vibronic coupling in α-Fe<sub>2</sub>O<sub>3</sub>
O'Neal, K. R.,Patete, J. M.,Chen, P.,Holinsworth, B. S.,Smith, J. M.,Lee, N.,Cheong, S.-W.,Wong, Stanislaus S.,Marques, C.,Aronson, M. C.,Musfeldt, J. L. American Institute of Physics 2014 The Journal of chemical physics Vol.141 No.4
<P>We report the discovery of finite length scale effects on vibronic coupling in nanoscale alpha-Fe2O3 as measured by the behavior of vibronically activated d-d on-site excitations of Fe3+ as a function of size and shape. An oscillator strength analysis reveals that the frequency of the coupled symmetry-breaking phonon changes with size, a crossover that we analyze in terms of increasing three-dimensional character to the displacement pattern. These findings demonstrate the flexibility of mixing processes in confined systems and suggest a strategy for both enhancing and controlling charge-lattice interactions in other materials. (C) 2014 AIP Publishing LLC.</P>