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Frustrated antiferromagnetic honeycomb-tunnel-like latticeCuR2Ge2O8(R=Pr, Nd, Sm, and Eu)
Cho, Hwanbeom,Kratochví,lová,, Marie,Lee, Nahyun,Sim, Hasung,Park, Je-Geun American Physical Society 2017 Physical Review B Vol.96 No.22
<P>New frustrated antiferromagnetic compounds CuR2Ge2O8 (R = Pr, Nd, Sm, Eu) have been investigated using high-resolution x-ray diffraction, magnetic, and heat capacity measurements. These systems show different magnetic lattices depending on rare-earth element. The nonmagnetic Eu compound is a S = 1/2 two-dimensional triangular antiferromagnetic lattice oriented in the ac plane with geometrical frustration. On the other hand, the Pr, Nd, and Sm compounds show a three-dimensional honeycomb-tunnel-like lattice made of R3+ running along the a axis with the characteristic behavior of frustrated antiferromagnets.</P>
Properties of spin-12triangular-lattice antiferromagnetsCuY2Ge2O8andCuLa2Ge2O8
Cho, Hwanbeom,Kratochví,lová,, Marie,Sim, Hasung,Choi, Ki-Young,Kim, Choong Hyun,Paulsen, Carley,Avdeev, Maxim,Peets, Darren C.,Jo, Younghun,Lee, Sanghyun,Noda, Yukio,Lawler, Michael J.,Pa American Physical Society 2017 Physical review. B Vol.95 No.14
<P>We found new two-dimensional (2D) quantum (S = 1/2) antiferromagnetic systems: CuRE2Ge2O8 (RE = Y and La). According to our analysis of high-resolution x-ray and neutron diffraction experiments, the Cu network of CuRE2Ge2O8 (RE = Y and La) exhibits a 2D triangular lattice linked via weak bonds along the perpendicular b axis. Our bulk characterizations from 0.08 to 400 K show that they undergo a long-range order at 0.51(1) and 1.09(4) K for the Y and La systems, respectively. Interestingly, they also exhibit field induced phase transitions. For theoretical understanding, we carried out the density functional theory (DFT) band calculations to find that they are typical charge-transfer-type insulators with a gap of E-g congruent to 2 eV. Taken together, our observations make CuRE2Ge2O8 (RE = Y and La) additional examples of low-dimensional quantum spin triangular antiferromagnets with the low-temperature magnetic ordering.</P>