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Tracking the continuous spin-flop transition inNi3TeO6by infrared spectroscopy
Yokosuk, Michael O.,Artyukhin, Sergey,al-Wahish, Amal,Wang, Xueyun,Yang, Junjie,Li, Zhiqiang,Cheong, Sang-Wook,Vanderbilt, David,Musfeldt, Janice L. American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.92 No.14
Magnetic field-temperature phase diagram of multiferroic [(CH3)2NH2]Mn(HCOO)3
Clune, A. J.,Hughey, K. D.,Lee, C.,Abhyankar, N.,Ding, X.,Dalal, N. S.,Whangbo, M.-H.,Singleton, J.,Musfeldt, J. L. American Physical Society 2017 Physical Review B Vol.96 No.10
<P>We combined pulsed field magnetization and first-principles spin-density calculations to reveal the magnetic field-temperature phase diagram and spin state character in multiferroic [(CH3)(2)NH2]Mn(HCOO)(3). Despite similarities with the rare earth manganites, the phase diagram is analogous to other Mn-based quantum magnets with a 0.31 T spin flop, a 15.3 T transition to the fully polarized state, and short-range correlations that persist above the ordering temperature. The experimentally accessible saturation field opens the door to exploration of the high-field phase.</P>
Magnetoelectric Coupling through the Spin Flop Transition in<sub>Ni3</sub><sub>TeO6</sub>
Yokosuk, M. O.,al-Wahish, Amal,Artyukhin, Sergey,O’Neal, K. R.,Mazumdar, D.,Chen, P.,Yang, Junjie,Oh, Yoon Seok,McGill, Stephen A.,Haule, K.,Cheong, Sang-Wook,Vanderbilt, David,Musfeldt, J. L. American Physical Society 2016 Physical Review Letters Vol.117 No.14
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>