Zobrazeno 1 - 10
of 305
pro vyhledávání: '"BENOMAR, M."'
Publikováno v:
Phys. Rev. B 83, 174435 (2011)
We study the magnetic susceptibility of mixed-valent La2-xSrxCoO4 single crystals in the doping range of 0.5<= x <= 0.8 for temperatures up to 1000 K. The magnetism below room temperature is described by paramagnetic Co2+ in the high-spin state and b
Externí odkaz:
http://arxiv.org/abs/1204.0730
Autor:
Schlappa, J., Chang, C. F., Schierle, E., Tanaka, A., Feyerherm, R., Hu, Z., Ott, H., Friedt, O., Dudzik, E., Hung, H. -H., Benomar, M., Braden, M., Tjeng, L. H., Schuessler-Langeheine, C.
We studied the stripe phase of La1.8Sr0.2NiO4 using neutron diffraction, resonant soft x-ray diffraction (RSXD) at the Ni L2,3 edges, and resonant x-ray diffraction (RXD) at the Ni K threshold. Differences in the q-space resolution of the different t
Externí odkaz:
http://arxiv.org/abs/0903.0994
Autor:
Chang, C. F., Hu, Z., Wu, Hua, Burnus, T., Hollmann, N., Benomar, M., Lorenz, T., Tanaka, A., Lin, H. -J., Hsieh, H. H., Chen, C. T., Tjeng, L. H.
Publikováno v:
Physical Review Letters 102, 116401 (2009)
Using Co-L_(2,3) and O-K x-ray absorption spectroscopy, we reveal that the charge ordering in La_(1.5)Sr_(0.5)CoO4 involves high spin (S=3/2) Co^2+ and low spin (S=0) Co^3+ ions. This provides evidence for the spin blockade phenomenon as a source for
Externí odkaz:
http://arxiv.org/abs/0901.3642
Spin correlations in LSCO have been studied by neutron scattering. The commensurate antiferromagnetic order of the parent compound persists on a very short range up to a Sr content of x=0.3, whereas small amounts of Sr suppress commensurate antiferro
Externí odkaz:
http://arxiv.org/abs/0808.0106
Publikováno v:
Phys. Rev. B, 78, 134402, (2008)
We present a combined study of the thermal expansion and the thermal conductivity of the perovskite series RCoO_3 with R = La, Nd, Pr and Eu. The well-known spin-state transition in LaCoO_3 is strongly affected by the exchange of the R ions due to th
Externí odkaz:
http://arxiv.org/abs/0803.1957
Publikováno v:
New J. of Phys. 10, 023018 (2008)
We present a study of the magnetic susceptibility of La_2-xSr_xCoO_4 single crystals in a doping range 0.3<=x<=0.8. Our data shows a pronounced magnetic anisotropy for all compounds. This anisotropy is in agreement with a low-spin ground state (S=0)
Externí odkaz:
http://arxiv.org/abs/0801.2087
Autor:
Senff, D., Schumann, O., Benomar, M., Kriener, M., Lorenz, T., Sidis, Y., Habicht, K., Link, P., Braden, M.
The magnetic correlations in the charge- and orbital-ordered manganite La(0.5)Sr(1.5)MnO(4) have been studied by elastic and inelastic neutron scattering techniques. Out of the well-defined CE-type magnetic structure with the corresponding magnons a
Externí odkaz:
http://arxiv.org/abs/0801.1787
Autor:
Gössling, A., Haverkort, M. W., Benomar, M., Wu, H., Senff, D., Möller, T., Braden, M., Mydosh, J. A., Grüninger, M.
Publikováno v:
Phys. Rev. B 77, 035109 (2008)
Using spectroscopic ellipsometry, we study the optical conductivity sigma(omega) of insulating LaSrMnO4 in the energy range of 0.75-5.8 eV from 15 to 330 K. The layered structure gives rise to a pronounced anisotropy. A multipeak structure is observe
Externí odkaz:
http://arxiv.org/abs/0709.3711
The magnon dispersion in the charge, orbital and spin ordered phase in La(0.5)Sr(1.5)MnO(4) has been studied by means of inelastic neutron scattering. We find an excellent agreement with a magnetic interaction model basing on the CE-type superstructu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0512305
Autor:
Schuessler-Langeheine, C., Schlappa, J., Tanaka, A., Hu, Z., Chang, C. F., Schierle, E., Benomar, M., Ott, H., Weschke, E., Kaindl, G., Friedt, O., Sawatzky, G. A., Lin, H. -J., Chen, C. T., Braden, M., Tjeng, L. H.
Strong resonant enhancements of the charge-order and spin-order superstructure-diffraction intensities in La1.8Sr0.2NiO4 are observed when x-ray energies in the vicinity of the Ni L2,3 absorption edges are used. The pronounced photon-energy and polar
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502357