Low energy excitations in CoO studied by temperature dependent x-ray absorption spectroscopy (2008)
Haverkort, M. W., Tanaka, A., Hu, Z., Hsieh, H. H., Chen, C. T., ...
We have measured the intricate temperature dependence of the Co L2,3 x-ray absorption spectra (2p-3d excitations) of CoO. To allow for accurate total electron yield measurements, the material has...
Ising magnetism and ferroelectricity in Ca$_3$CoMnO$_6$ (2008)
Wu, Hua, Burnus, T., Hu, Z., Martin, C., Maignan, A., Cezar, J. C., ...
The origin of both the Ising chain magnetism and ferroelectricity in Ca$_3$CoMnO$_6$ is studied by $ab$ $initio$ electronic structure calculations and x-ray absorption spectroscopy. We find that...
Image charge screening: a new approach to enhance magnetic ordering temperatures (2008)
Altieri, S., Finazzi, M., Hsieh, H. H., Haverkort, M. W., Chen, C. T., ...
We have tested the concept of image charge screening as a new approach to enhance magnetic ordering temperatures and superexchange interactions in ultra thin films. Using a 3 monolayer NiO(100) film...
Atomic multiplet calculation of 3d_{5/2} -> 4f resonant x-ray diffraction from Ho metal (2008)
Haverkort, M. W., Schüßler-Langeheine, C., Chang, C. F., Buchholz, M., Ott, H., ...
We compare for Ho metal the x-ray absorption spectrum and the resonant soft x-ray diffraction spectra obtained at the $3d_{5/2} \to 4f$ ($M_5$) resonance for the magnetic 1st and 2nd order...
Resonant soft x-ray scattering from stepped surfaces of SrTiO3 (2008)
Schlappa, J., Schüßler-Langeheine, C., Chang, C. F., Hu, Z., Schierle, E., Ott, H., ...
We studied the resonant diffraction signal from stepped surfaces of SrTiO3 at the Ti 2p -> 3d (L2,3) resonance in comparison with x-ray absorption (XAS) and specular reflectivity data. The steps on...
X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6 (2008)
Burnus, T., Hu, Z., Wu, Hua, Cezar, J. C., Niitaka, S., Takagi, H., ...
Using x-ray absorption spectroscopy at the Rh-L_2,3, Co-L_2,3, and Fe-L_2,3 edges, we find a valence state of Co^2+/Rh^4+ in Ca3CoRhO6 and of Fe^3+/Rh^3+ in Ca3FeRhO6. X-ray magnetic circular...
Strong spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4 (2008)
Haverkort, M. W., Elfimov, I. S., Tjeng, L. H., Sawatzky, G. A., Damascelli, A.
We present a first-principle study of spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4. For nearly degenerate bands, spin-orbit coupling leads to a dramatic change of the Fermi...
Crystal-field level inversion in lightly Mn-doped Sr3Ru2O7 (2008)
Hossain, M. A., Hu, Z., Haverkort, M. W., Burnus, T., Chang, C. F., Klein, S., ...
Sr3(Ru1-xMnx)2O7, in which 4d-Ru is substituted by the more localized 3d-Mn, is studied by x-ray dichroism and spin-resolved density functional theory. We find that Mn impurities do not exhibit the...
Krug, I. P., Hillebrecht, F. U., Gomonaj, H., Haverkort, M., Tanaka, A., Tjeng, L. H., ...
We present a laterally resolved X-ray magnetic dichroism study of the magnetic proximity effect in a highly ordered oxide system, i.e. NiO films on Fe3O4(110). We found that the magnetic interface...
Hansmann, P., Severing, A., Hu, Z., Haverkort, M. W., Chang, C. F., Klein, S., ...
We infer that soft-x-ray absorption spectroscopy is a versatile method for the determination of the crystal-field ground state symmetry of rare earth Heavy Fermion systems, complementing neutron...
Burnus, T., Hu, Z., Hsieh, H. H., Joly, V. L. J., Joy, P. A., Haverkort, M. W., ...
We have studied the local electronic structure of LaMn0.5Co0.5O3 using soft-x-ray absorption spectroscopy at the Co-L_3,2 and Mn-L_3,2 edges. We found a high-spin Co^{2+}--Mn^{4+} valence state for...
Non-resonant inelastic x-ray scattering involving excitonic excitations (2007)
Haverkort, M. W., Tanaka, A., Tjeng, L. H., Sawatzky, G. A.
In a recent publication Larson \textit{et al.} reported remarkably clear $d$-$d$ excitations for NiO and CoO measured with x-ray energies well below the transition metal $K$ edge. In this letter we...
Direct observation of t2g orbital ordering in magnetite (2006)
Schlappa, J., Schuessler-Langeheine, C., Chang, C. F., Ott, H., Tanaka, A., Hu, Z., ...
Using soft-x-ray diffraction at the site-specific resonances in the Fe L23 edge, we find clear evidence for orbital and charge ordering in magnetite below the Verwey transition. The spectra show...
Rzhevsky, A. A., Krichevtsov, B. B., Rata, A.D., Chang, C.F., Sutarto, R., Tjeng, L. H., ...
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Aligning spins in antiferromagnetic films using antiferromagnets (2005)
Csiszar, S. I., Haverkort, M. W., Burnus, T., Hu, Z., Tanaka, A., Hsieh, H. H., ...
We have explored the possibility to orient spins in antiferromagnetic thin films with low magnetocrystalline anisotropy via the exchange coupling to adjacent antiferromagnetic films with high...
Direct observation of electron doping in La0.7Ce0.3MnO3 using x-ray absorption spectroscopy (2003)
Mitra, C., Hu, Z., Raychaudhuri, P., Wirth, S., Csiszar, S. I., Hsieh, H. H., ...
Study of magnetism using circularly polarized soft X-rays (1998)
Brookes, N.B., Sinkovic, B., Tjeng, L.H., Goedkoop, J.B., Hesper, R., Pellegrin, E., ...
It hes recently been shown that spin-resolved valence band photoemission spectra can be obtained from macroscopically non-magnetic transition metal materials. This is achieved by combining circularly...
Sinkovic, B., Tjeng, L.H., Brookes, N.B., Goedkoop, J.B., Hesper, R., Pellegrin, E., ...
We report the measurement of the local Ni 3d spin polarization, not only below but also above the Curie temperature (TC), using the newly developed spin-resolved circularly polarized 2p (L3) resonant...
Phase transition in LiVO2 studied by near-edge x-ray-absorption spectroscopy (1997)
Pen, H.F., Tjeng, L.H., Pellegrin, E., Sawatzky, G.A., Veenendaal, M.A. Van, ...
We present temperature-dependent V-2p and O-1s x-ray-absorption spectra of LiVO2. The aim of this study is to monitor changes in electronic structure on going through the phase transition. The...
Tjeng, L.H., Sinkovic, B., Brookes, N.B., Goedkoop, J.B., Hesper, R., Pellegrin, E., ...
We demonstrate that it is possible to obtain spin-resolved valence band spectra with a very high degree of spin polarization from antiferromagnetic transition metal materials if the excitation light...
Pellegrin, E., Tjeng, L.H., Hesper, R., Sawatzky, G.A., Moritomo, Y., ...
Soft X-ray magnetic circular dichroism (SXMCD) measurements are reported on the O K- and Mn L-absorption edges of La1-x Srx MnO3 (x = 0.15, 0.18, and 0.4) single crystals in their ferromagnetic...
Development of the Electronic Structure in a K-Doped C60 Monolayer on a Ag(1 1 1) Surface (1997)
Tjeng, L.H., Hesper, R., Heessels, A.C.L., Heeres, A., Jonkman, H.T., Sawatzky, G.A.
We present an electron spectroscopy study of the development of the electronic structure in the K-doped C60 monolayer on a Ag(1 1 1) surface. We find that the occupation of the lowest unoccupied...
Magnetic circularly polarized 2p resonant photoemission of nickel (1993)
Tjeng, L.H., Chen, C.T., Rudolf, P., Meigs, G., Laan, G. Van Der, Thole, B.T.
We report the observation of two resonance channels in the 2p resonant photoemission of ferromagnetic nickel using circularly polarized soft x rays. By identifying the local 3d8 and 3d7...
Kuiper, Pieter, Searle, Barry G., Rudolf, Petra, Tjeng, L.H., Chen, C.T.
We report strong magnetic linear dichroism at the Fe L2,3 edge of the antiferromagnet Fe2O3 (hematite), The relative difference in absorption for light polarized parallel and perpendicular to the...
Rudolf, P., Sette, F., Tjeng, L.H., Meigs, G., Chen, C.T.
The magnetic moments of Gd and Fe in gadolinium iron garnet (Gd3Fe5O12) were probed at 77 and 300 K by soft-X-ray magnetic circular dichroism (SXMCD) measurements at the GdMa4,5 and at the FeL2,3...
Tjeng, L.H., Ldzerda, Y.U., Rudolf, P., Sette, F., Chen, C.T.
We demonstrate the feasibility of applying the novel soft-X-ray magnetic circular dichroism (SXMCD) technique to investigate the magnetic properties of magnetic surfaces and uitrathin films....
Out-of-Plane Orbital Characters of Intrinsic and Doped Holes in La2–xSrxCuO4 (1992)
Chen, C.T., Tjeng, L.H., Kwo, J., Kao, H.L., Rudolf, P., Sette, F., ...
Bulk-sensitive, polarization-dependent O K- and Cu L-edge absorption spectra of single-domain La2–xSrxCuO4 with CuO2 planes tilted off the sample surface were measured. A novel experimental...
Electronic states and phases of KxC60 from photoemission and X-ray absorption spectroscopy (1991)
Chen, C.T., Tjeng, L.H., Rudolf, P., Meigs, G., Rowe, J.E., Chen, J., ...
High-resolution photoemission and soft X-ray absorption spectroscopies have provided valuable information on the electronic structure near the Fermi energy in the superconducting copper oxide...
Giant Cu 2p Resonances in CuO Valence-Band Photoemission (1991)
Tjeng, L.H., Chen, C.T., Ghijsen, J., Rudolf, P., Sette, F.
We report the observation of a giant resonance in the Cu 2p resonant-photoemission spectra of CuO. The study allows the unambiguous identification of the local Cu 3d8 configuration in the...