E. Pomjakushina

LaBaNiO4: A Fermi glass (2008)

Schilling, A., DellAmore, R., Karpinski, J., Medarde, M., Pomjakushina, E., Mueller, K. A.

Polycrystalline samples of LaSr1-xBaxNiO4 show a crossover from a state with metallic transport properties for x = 0 to an insulating state as x -> 1. The end member LaBaNiO4 with a nominal nickel Ni...

Microscopic Evidence of Spin State Order and Spin State Phase Separation in Layered Cobaltites RBaCo2O5.5 with R=Y, Tb, Dy, and Ho (2008)

Luetkens, H., Stingaciu, M., Pashkevich, Yu. G., Conder, K., Pomjakushina, E., Gusev, A. A., ...

We report muon spin relaxation measurements on the magnetic structures of RBaCo_2O_5.5 with R=Y, Tb, Dy, and Ho. Three different phases, one ferrimagnetic and two antiferromagnetic, are identified...

Spin-state polaron in lightly hole-doped LaCoO_3 (2008)

Podlesnyak, A., Russina, M., Furrer, A., Alfonsov, A., Vavilova, E., Kataev, V., ...

Inelastic neutron scattering (INS), electron spin (ESR) and nuclear magnetic resonance (NMR) measurements were employed to establish the origin of the strong magnetic signal in lightly hole-doped...

A Resonant soft x-ray powder diffraction study to determine the orbital ordering in A-site ordered SmBaMn2O6 (2008)

Garcia-Fernandez, M., Staub, U., Bodenthin, Y., Lawrence, S. M., Mulders, A. M., Buckley, C. E., ...

Soft X-ray resonant powder diffraction has been performed at the Mn L2,3 edges of A-site ordered SmBaMn2O6. The energy and polarization dependence of the (1/2 1/2 0) reflection provide direct...

Oxygen isotope effect on superconductivity and magnetism in Y_1-xPr_xBa_2Cu_3O_7-\delta (2007)

Khasanov, R., Shengelaya, A., Di Castro, D., Morenzoni, E., Maisuradze, A., Savić, I. M., ...

Oxygen isotope (^{16}O/^{18}O) effects (OIE's) on the superconducting transition (T_c), the spin-glass ordering (T_g), and the antiferromagnetic ordering (T_N) temperatures were studied for...

Oxygen-isotope effect on the superconducting gap in the cuprate superconductor Y_{1-x}Pr_xBa_2Cu_3O_{7-\delta} (2007)

Khasanov, R., Strässle, S., Conder, K., Pomjakushina, E., Bussmann-Holder, A., Keller, H.

The oxygen-isotope (^{16}O/^{18}O) effect (OIE) on the zero-temperature superconducting energy gap \Delta_0 was studied for a series of Y_{1-x}Pr_xBa_2Cu_3O_{7-\delta} samples (0.0\leq x\leq0.45)....

Magnetic excitations in the spin-trimer compounds Ca3Cu3-xNix(PO4)4 (x=0,1,2) (2007)

Podlesnyak, A., Pomjakushin, V., Pomjakushina, E., Conder, K., Furrer, A.

Inelastic neutron scattering experiments were performed for the spin-trimer compounds Ca3Cu3-xNix(PO4)4 (x=0,1,2) in order to study the dynamic magnetic properties. The observed excitations can be...

Magnetism in geometrically frustrated YMnO3 under hydrostatic pressure studied with muon spin relaxation (2007)

Lancaster, T, Blundell, SJ, Andreica, D, Janoschek, M, Roessli, B, Gvasaliya, SN, ...

Magnetic field dependence of the oxygen isotope effect on the magnetic penetration depth in hole-doped cuprate superconductors (2006)

Khasanov, R., Shengelaya, A., Di Castro, D, Eshchenko, D. G., Savich, I. M., Conder, K., ...

The magnetic field dependence of the oxygen-isotope (^{16}O/^{18}O) effect (OIE) on the in-plane magnetic field penetration depth \lambda_{ab} was studied in the hole-doped high-temperature cuprate...

Magnetism in Geometrically Frustrated YMnO3 Under Hydrostatic Pressure Studied with Implanted Muons (2006)

Lancaster, T., Blundell, S. J., Andreica, D., Janoschek, M., Roessli, B., Gvasaliya, S. N., ...

The rare-earth ferroelectromagnet YMnO3 consists of weakly coupled triangular layers of S=2 spins. Below T_N ~ 70 K muon-spin relaxation data show two oscillatory relaxing signals due to magnetic...

Effect of light Sr doping on the spin-state transition in LaCoO_3 (2006)

Podlesnyak, A., Conder, K., Pomjakushina, E., Mirmelstein, A., Allenspach, P., Khomskii, D. I.

We present an inelastic neutron scattering study of the low energy crystal-field excitations in the lightly doped cobalt perovskite La_0.998Sr_0.002CoO_3. In contrast to the parent compound LaCoO_3...

Reduction of the ordered magnetic moment in YMnO3 with hydrostatic pressure (2005)

Janoschek, M., Roessli, B., Keller, L., Gvasaliya, S. N., Conder, K., Pomjakushina, E.

YMnO3 exhibits a ferroelectric transition at high temperature (~ 900 K) and magnetic ordering at T_N ~ 70 K where the dielectric constant shows an anomaly indicative of the magneto-dielectric effect....

Spin-state transition in LaCoO3: direct neutron spectroscopic evidence of excited magnetic states (2005)

Podlesnyak, A., Streule, S., Mesot, J., Medarde, M., Pomjakushina, E., Conder, K., ...

A gradual spin-state transition occurs in LaCoO3 around T~80-120 K, whose detailed nature remains controversial. We studied this transition by means of inelastic neutron scattering (INS), and found...

Spin fluctuations in the stacked-triangular antiferromagnet YMnO3 (2005)

Roessli, B., Gvasaliya, S. N., Pomjakushina, E., Conder, K.

The spectrum of spin fluctuations in the stacked-triangular antiferromagnet YMnO3 was studied above the Neel temperature using both unpolarized and polarized inelastic neutron scattering. We find an...

Spin structure and magnetic phase transitions in TbBaCo2O5.5 (2004)

Plakhty, V. P., Chernenkov, Yu. P., Barilo, S. N., Podlesnyak, A., Pomjakushina, E., Khalyavin, D. D., ...

Spin ordering in TbBaCo2O5.5 and its temperature transformation is studied. Polymorphism due to the oxygen ordering with the average content close to 5.5 is investigated. One of ceramic samples (I),...

Evidence for charged critical fluctuations in underdoped Y-123 (2004)

Schneider, T., Khasanov, R., Conder, K., Pomjakushina, E., Bruetsch, R., Keller, H.

We report and analyze in-plane penetration depth measurements in YBa2Cu3O7-x taken close to the critical temperature Tc. In underdoped YBa2Cu3O6:59 we find consistent evidence for charged critical...