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Your search keyword '"Hradil, K."' showing total 9 results
Start Over Author "Hradil, K." Journal physical review b
9 results on '"Hradil, K."'

2. Spin reorientation and glassy dynamics in La(1.55)Sr(0.45)NiO(4)

Author

Giblin, SR, Freeman, P, Hradil, K, Prabhakaran, D, and Boothroyd, A

Subjects
Condensed Matter::Strongly Correlated Electrons
Abstract

The magnetism of charge-stripe-ordered La1.55Sr 0.45NiO4 was studied by a combination of neutron diffraction, muon-spin relaxation (μSR), and bulk susceptibility. Long-range magnetic ordering was observed at a lower temperature by μSR than by neutron diffraction, consistent with a glassy transition to the ordered phase. A second magnetic transition is detected by all techniques and is consistent with a spin reorientation. On cooling below TSR=42 K the spins reorientate from lying 32.9±0.6° away from the stripe direction at 70 K to 56.8±0.4° at 10 K. The magnetic order was observed by neutron diffraction to have both three-dimensional and two-dimensional (without any correlation along the c axis) characters. μSR measurements confirmed this and are consistent with a single magnetically ordered spin-stripe phase. The effects of checkerboard charge order on the ordered phase and the characteristics of the phase diagram of the spin reorientation in charge-ordered La2-xSrxNiO4 are commented on. © 2008 The American Physical Society.

Published
2008

6. Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides

Author

Park, J. T., primary, Inosov, D. S., additional, Yaresko, A., additional, Graser, S., additional, Sun, D. L., additional, Bourges, Ph., additional, Sidis, Y., additional, Li, Yuan, additional, Kim, J.-H., additional, Haug, D., additional, Ivanov, A., additional, Hradil, K., additional, Schneidewind, A., additional, Link, P., additional, Faulhaber, E., additional, Glavatskyy, I., additional, Lin, C. T., additional, Keimer, B., additional, and Hinkov, V., additional

Published
2010
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9. Magnetic excitations of the charge stripe electrons below half doping in La2-xSrxNiO4 (x = 0.45, 0.4).

Author

Freeman, P. G., Giblin, S. R., Hradil, K., Mole, R. A., Cermak, P., and Prabhakaran, D.

Subjects
*ELECTRONS, *LANTHANUM, *NICKEL oxide
Abstract

The low energy magnetic excitation spectrum of charge stripe ordered La2-xSrxNiO4, x=0.4 and x=0.45 samples, were studied by neutron scattering. Two excitation modes are observed in both materials, one from the ordered magnetic moments, and a second mode consistent with pseudo-one-dimensional antiferromagnetic excitations of the charge stripe electrons (q-1D). The dispersion of the q-1D excitation follows the same relation as in x=1/3 composition, with even spectral weight in the two counterpropagating branches of the x=0.4 sample, however in the x=0.45 sample only one dispersion branch has any measurable spectral weight. The evolution of the q-1D excitations on doping to the checkerboard charge ordered phase is discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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