H. H. Hsieh
National Defense University
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Featured researches published by H. H. Hsieh.
Physical Review Letters | 2005
M. W. Haverkort; Z. Hu; A. Tanaka; W. Reichelt; S. V. Streltsov; M. A. Korotin; V. I. Anisimov; H. H. Hsieh; H.-J. Lin; Chuangtian Chen; D. I. Khomskii; L. H. Tjeng
We found direct experimental evidence for an orbital switching in the V 3d states across the metal-insulator transition in VO2. We have used soft-x-ray absorption spectroscopy at the V L2,3 edges as a sensitive local probe and have determined quantitatively the orbital polarizations. These results strongly suggest that, in going from the metallic to the insulating state, the orbital occupation changes in a manner that charge fluctuations and effective bandwidths are reduced, that the system becomes more one dimensional and more susceptible to a Peierls-like transition, and that the required massive orbital switching can only be made if the system is close to a Mott insulating regime.
Physical Review B | 2006
T. Burnus; Z. Hu; M. W. Haverkort; J. C. Cezar; D. Flahaut; V. Hardy; A. Maignan; N. B. Brookes; A. Tanaka; H. H. Hsieh; H.-J. Lin; Chuangtian Chen; L. H. Tjeng
We have investigated the valence, spin, and orbital state of the Co ions in the one-dimensional cobaltate Ca3Co2O6 using x-ray absorption and x-ray magnetic circular dichroism at the Co-L2,3 edges. The Co ions at both the octahedral Cooct and trigonal Cotrig sites are found to be in a 3+ state. From the analysis of the dichroism we established a low-spin state for the Cooct and a high-spin state with an anomalously large orbital moment of 1.7B at the Co trig ions. This large orbital moment along the c-axis chain and the unusually large magnetocrystalline anisotropy can be traced back to the double occupancy of the d2 orbital in trigonal crystal field.
Physical Review B | 2004
M. W. Haverkort; S. I. Csiszar; Z. Hu; S. Altieri; A. Tanaka; H. H. Hsieh; Hong Ji Lin; Chien Te Chen; T. Hibma; L. H. Tjeng
We have detected strong dichroism in the Ni L-2,L-3 x-ray absorption spectra of a monolayer NiO film. The dichroic signal appears to be very similar to the magnetic linear dichroism observed for thicker antiferromagnetic NiO films. Detailed analysis reveals, however, that the dichroism is caused by crystal-field effects in the monolayer film, which is a nontrivial effect because the high spin Ni 3d(8) ground state is not split by low-symmetry crystal fields. We present a practical method for identifying the independent magnetic and crystal-field contributions to the linear dichroic signal in spectra of NiO films with arbitrary thicknesses and lattice strains. Our findings are also relevant for 3d(5) and 3d(3) systems such as LaFeO3, Fe2O3, VO, LaCrO3, Cr2O3, and Mn4+ thin films.
Physical Review B | 2006
H. Ott; S. J. Heise; R. Sutarto; Z. Hu; C. F. Chang; H. H. Hsieh; H.-J. Lin; Chuangtian Chen; L. H. Tjeng
We report on the growth and magnetic properties of Gd-doped
Physical Review B | 2009
R. Sutarto; S. G. Altendorf; B. Coloru; M. Moretti Sala; T. Haupricht; Calvin Chang; Z. Hu; C. Schüßler-Langeheine; N. Hollmann; H. Kierspel; H. H. Hsieh; H.-J. Lin; Chuangtian Chen; L. H. Tjeng
\mathrm{EuO}
Physical Review B | 2003
C. Mitra; Z. Hu; Pratap Raychaudhuri; S. Wirth; S. I. Csiszar; H. H. Hsieh; H.-J. Lin; Chuangtian Chen; L. H. Tjeng
thin films. We prepared samples with Gd concentrations up to
Physical Review Letters | 2008
Philipp Hansmann; A. Severing; Z. Hu; M. W. Haverkort; C. F. Chang; S. Klein; A. Tanaka; H. H. Hsieh; H.-J. Lin; Chuangtian Chen; B. Fåk; P. Lejay; L. H. Tjeng
11%
Physical Review Letters | 2005
S. I. Csiszar; M. W. Haverkort; Z. Hu; A. Tanaka; H. H. Hsieh; H.-J. Lin; Chuangtian Chen; T. Hibma; L. H. Tjeng
by means of molecular beam epitaxy under distillation conditions. Using soft x-ray magnetic circular dichroism at the Eu and Gd
Physical Review Letters | 2004
Z. Hu; Hua Wu; M. W. Haverkort; H. H. Hsieh; H.-J. Lin; T. Lorenz; J. Baier; A. Reichl; I. Bonn; C. Felser; A. Tanaka; C. T. Chen; L. H. Tjeng
{M}_{4,5}
Physical Review Letters | 2006
Hua Wu; Z. Hu; T. Burnus; Jonathan D. Denlinger; Peter G. Khalifah; David Mandrus; L. Y. Jang; H. H. Hsieh; A. Tanaka; K. S. Liang; J. W. Allen; R. J. Cava; D. I. Khomskii; L. H. Tjeng
edges, we found that