Pedro Schlottmann

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We report the magnetic and electric properties of Ba3NiNb2O9, which is a quasi-two-dimensional spin-one triangular-lattice antiferromagnet with trigonal structure. At low T and with increasing magnetic field, the system evolves from a 120 degree magnetic ordering phase (A phase) to an up-up-down (uud) phase (B phase) with a change of slope at 1/3 of the(More)
We report an experimental/theoretical study of single-crystal Bi(2)Ir(2)O(7) that possesses a metallic state with strongly exchange-enhanced paramagnetism. The ground state of Bi(2)Ir(2)O(7) is characterized by the following features: (1) a divergent low-temperature magnetic susceptibility that indicates no long-range order down to 50 mK; (2) strongly(More)
Transport and magnetic studies of Ca3Ru2O7 for temperatures ranging from 0.4 to 56 K and magnetic fields B up to 45 T lead to strikingly different behavior when the field is applied along the different crystal axes. A ferromagnetic (FM) state with full spin polarization is achieved for the B//a axis, but colossal magnetoresistance is realized only for the(More)
O. B. Korneta,1,2 S. Chikara,1,2 S. Parkin,1,3 L. E. DeLong,1,2 P. Schlottmann,4 and G. Cao1,2,* 1Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA 2Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA 3Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, USA(More)
Modern effective-theory techniques are applied to the nuclear many-body problem and frustrated quantum spin chains. A novel approach is proposed for the renormalization of nucleon-nucleon operators in a manner consistent with the construction of the effective potential. To test this approach a one-dimensional, yet realistic, nucleon-nucleon potential is(More)
Dilute Nd in simple cubic LaB(6) shows electrical resistance and specific heat features at low temperature consistent with a Kondo scale of T(K) </~ 0.3 K. Nd has a well-localized 4f(3) J = 9/2 Hund's rule configuration which is not anticipated to be Kondo coupled to the conduction electrons in LaB(6). We conjecture that the unexpected Kondo effect arises(More)
We report structural, magnetic, dielectric and thermal properties of single-crystal BaMnO(2.99) and its derivatives BaMn(0.97)Li(0.03)O(3) and Ba(0.97)K(0.03)MnO(3). The hexagonal 15R-BaMnO(2.99) perovskite phase is a known antiferromagnetic insulator that orders at a Néel temperature T(N) = 220 K. We find dilute Li and K doping change the ratio of cubic to(More)
O. B. Korneta,1,2 Tongfei Qi,1,2 S. Chikara,1,2 S. Parkin,1,3 L. E. De Long,1,2 P. Schlottmann,4 and G. Cao1,2,* 1Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA 2Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA 3Department of Chemistry, University of Kentucky, Lexington,(More)
The spin-valve effect is a quantum phenomenon so far only realized in multilayer thin films or heterostructures. Here we report a strong spin-valve effect existing in bulk single crystals of Ca3(Ru1-xCrx)2O7 having an anisotropic, bilayered crystal structure. This discovery opens new avenues to understand the underlying physics of spin valves, and fully(More)
Zhixian Zhou,1,* Rongying Jin,1 Gyula Eres,1 David Mandrus,1 Victor Barzykin,2 Pedro Schlottmann,3 Yew-San Hor,4 Zhili Xiao,4,5 and John F. Mitchell4 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 2Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA(More)