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Sim, Hasung,Lee, Seongsu,Hong, Kun-Pyo,Jeong, Jaehong,Zhang, J. R.,Kamiyama, T.,Adroja, D. T.,Murray, C. A.,Thompson, S. P.,Iga, F.,Ji, S.,Khomskii, D.,Park, Je-Geun American Physical Society 2016 Physical Review B Vol.94 No.19
<P>DyB4 has a two-dimensional Shastry-Sutherland (Sh-S) lattice with strong Ising character of the Dy ions. Despite the intrinsic frustrations, it undergoes two successive transitions: a magnetic ordering at T-N = 20K and a quadrupole ordering at T-Q = 12.5K. From high-resolution neutron and synchrotron x-ray powder diffraction studies, we have obtained full structural information on this material in all phases and demonstrate that structural modifications occurring at quadrupolar transition lead to the lifting of frustrations inherent in the Sh-S model. Our paper thus provides a complete experimental picture of how the intrinsic frustration of the Sh-S lattice can be lifted by the coupling to quadrupole moments. We show that two other factors, i.e., strong spin-orbit coupling and long-range Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in metallic DyB4, play an important role in this behavior.</P>
Observation of two spin gap energies in the filled skutterudite compoundCeOs4Sb12
Adroja, D. T.,Park, J.-G.,Goremychkin, E. A.,McEwen, K. A.,Takeda, N.,Rainford, B. D.,Knight, K. S.,Taylor, J. W.,Park, Jeongmi,Walker, H. C.,Osborn, R.,Riseborough, Peter S. American Physical Society 2007 Physical review. B, Condensed matter and materials Vol.75 No.1
Probing the vortex state ofPrRu4Sb12through muon spin rotation and relaxation
Adroja, D. T.,Hillier, A. D.,Park, J.-G.,Goremychkin, E. A.,McEwen, K. A.,Takeda, N.,Osborn, R.,Rainford, B. D.,Ibberson, R. M. American Physical Society 2005 Physical review. B, Condensed matter and materials Vol.72 No.18
Inhomogeneous Level Splitting inPr2−xBixRu2O7
van Duijn, J.,Kim, K. H.,Hur, N.,Adroja, D.,Adams, M. A.,Huang, Q. Z.,Jaime, M.,Cheong, S.-W.,Broholm, C.,Perring, T. G. American Physical Society 2005 Physical review letters Vol.94 No.17
<P>We report that Bi doping drives Pr 2-x BixRu2O7 from an antiferromagnetic insulator (x = 0) to a metallic paramagnet (x approximately 1) with a broad low T maximum in C/T. Neutron scattering reveals local low energy spin excitations (variant Planck's omega approximately 1 meV) with a spectrum that is unaffected by heating to k(B)T >> variant Planck's omega. We show that a continuous distribution of splittings of the non-Kramers Pr3+ ground-state doublet such as might result from various types of lattice strain can account for all the data.</P>
Zero-Field Ambient-Pressure Quantum Criticality in the Stoichiometric Non-Fermi Liquid System CeRhBi
Anand, Vivek K.,Adroja, Devashibhai T.,Hillier, Adrian D.,Shigetoh, Keisuke,Takabatake, Toshiro,Park, Je-Geun,McEwen, Keith A.,Pixley, Jedediah H.,Si, Qimiao Physical Society of Japan 2018 Journal of the Physical Society of Japan Vol.87 No.6
Negative magnetostrictive magnetoelectric coupling of BiFeO3
Lee, Sanghyun,Fernandez-Diaz, M. T.,Kimura, H.,Noda, Y.,Adroja, D. T.,Lee, Seongsu,Park, Junghwan,Kiryukhin, V.,Cheong, S.-W.,Mostovoy, M.,Park, Je-Geun American Physical Society 2013 Physical review. B, Condensed matter and materials Vol.88 No.6