Perucchi, A., Marini, C., Valentini, M., Postorino, P., Sopracase, R., Dore, P., ...
The metal to insulator transition (MIT) in the charge transfer NiS{2-x}Se{x} compound has been investigated through infrared reflectivity. Measurements were performed vs applied pressure in pure NiS2...
Kent, P. R. C., Saha-Dasgupta, T., Jepsen, O., Andersen, O. K., Macridin, A., Maier, T. A., ...
Using a combined local density functional theory (LDA-DFT) and quantum Monte Carlo (QMC) dynamic cluster approximation approach, the parameter dependence of the superconducting transition temperature...
Coulomb-Enhanced Spin-Orbit Splitting: The Missing Piece in the Sr2RhO4 Puzzle (2008)
Liu, Guo-Qiang, Antonov, V. N., Jepsen, O., Andersen, O. K.
The outstanding discrepancy between the measured and calculated (local-density approximation) Fermi surfaces in the well-characterized, paramagnetic Fermi liquid Sr2RhO4 is resolved by including the...
Sushkov, O. P., Xie, Wenhui, Jepsen, O., Andersen, O. K., Sawatzky, G. A.
Due to the orthorhombic distortion of the lattice, the electronic hopping integrals along the $a$ and $b$ diagonals, the orthorhombic directions, are slightly different. We calculate their difference...
Strong electron-phonon coupling in the rare-earth carbide superconductor La2C3 (2007)
Kim, J. S., Kremer, R. K., Babizhetskyy, V., Jepsen, O., Simon, A., ...
We present the results of a crystal structure determination using neutron powder diffraction as well as the superconducting properties of the rare-earth sesquicarbide La2C3 (Tc ~ 13.4 K) by means of...
Insights from ARPES for an undoped, four-layered, two-gap high-T_c superconductor (2006)
Xie, Wenhui, Jepsen, O., Andersen, O. K., Chen, Yulin
An undoped cuprate with apical fluorine and inner (i) and outer (o) CuO2-layers is a 60 K superconductor whose Fermi surface (FS) has large n- and p-doped sheets with the SC gap on the n-sheet twice...
Calculations of Hubbard U from first-principles (2006)
Aryasetiawan, F., Karlsson, K., Jepsen, O., Schonberger, U.
The Hubbard \emph{U} of the \emph{3d} transition metal series as well as SrVO$_{3}$, YTiO$_{3}$, Ce and Gd has been estimated using a recently proposed scheme based on the random-phase approximation....
Electronic structure and x-ray magnetic circular dichroism in the Heusler alloy Co2MnGe (2006)
Antonov, V. N., Jepsen, O., Yaresko, A. N., Shpak, A. P.
The electronic structure and x-ray magnetic circular dichroism (XMCD) spectra of the Heusler alloy Co2MnGe were investigated theoretically from first principles, using the fully relativistic Dirac...
Calculations of Hubbard U from first-principles (2006)
Aryasetiawan, F., Karlsson, K., Jepsen, O., Schönberger, U.
The Hubbard U of the 3d transition metal series as well as SrVO3, YTiO3, Ce, and Gd has been estimated using a recently proposed scheme based on the random-phase approximation. The values obtained...
Superconductivity in Boron under pressure - why are the measured T$_c$'s so low? (2005)
Bose, S. K., Kato, T., Jepsen, O.
Using the full potential linear muffin-tin orbitals (FP-LMTO) method we examine the pressure-dependence of superconductivity in the two metallic phases of Boron: bct and fcc. Linear response...
Mazin, I.I., Andersen, O.K., Jepsen, O., Golubov, A., Dolgov, O.V., Kortus, J.
Choi et al. [Phys. Rev. B 66, 020513 (2002)] recently presented first-principles calculations of the electron-phonon coupling and superconductivity in MgB2, emphasizing the importance of anisotropy...
Mazin, I. I., Andersen, O. K., Jepsen, O., Golubov, A. A., Dolgov, O. V., Kortus, J.
Choi [Phys. Rev. B 66, 020513 (2002)] recently presented first-principles calculations of the electron-phonon coupling and superconductivity in MgB2, emphasizing the importance of anisotropy and...
Mazin, I.I., Andersen, O.K., Jepsen, O., Golubov, Dr. A., Dolgov, O.V., Kortus, J.
Choi et al. [Phys. Rev. B 66, 020513 (2002)] recently presented first-principles calculations of the electron-phonon coupling and superconductivity in MgB2, emphasizing the importance of anisotropy...
Mazin, I.I., Andersen, O.K., Jepsen, O., Golubov, A.A., Dolgov, O.V., Kortus, J.
Choi et al. [Phys. Rev. B 66, 020513 (2002)] recently presented first-principles calculations of the electron-phonon coupling and superconductivity in MgB2, emphasizing the importance of anisotropy...
Mazin, I. I., Andersen, O. K., Jepsen, O., Golubov, A. A., Dolgov, O. V., Kortus, J.
Choi et al. [Phys. Rev. B 66, 020513 (2002)] recently presented first principles calculations of the electron-phonon coupling and superconductivity in MgB2, emphasizing the importance of anisotropy...
Bose, S. K., Dolgov, O. V., Kortus, J., Jepsen, O., Andersen, O. K.
A recent experiment by Shimizu et al. has provided evidence of a superconducting phase in hcp Fe under pressure. To study the pressure-dependence of this superconducting phase we have calculated the...
Multiband model for penetration depth in MgB2 (2002)
Golubov, A. A., Brinkman, A., Dolgov, O. V., Kortus, J., Jepsen, O.
The results of first principles calculations of the electronic structure and the electron-phonon interaction in MgB2 are used to study theoretically the temperature dependence and anisotropy of the...
Two-gap superconductivity in MgB$_{2}$: clean or dirty? (2002)
Mazin, I. I., Andersen, O. K., Jepsen, O., Dolgov, O. V., Kortus, J., Golubov, A. A., ...
A large number of experimental facts and theoretical arguments favor a two-gap model for superconductivity in MgB$_{2}$. However, this model predicts strong suppression of the critical temperature by...
Specific heat of MgB2 in a one- and two-band model from first-principels calculations (2002)
Golubov, A., Kortus, J., Dolgov, O.V., Jepsen, O., Kong, Y., Andersen, O.K., ...
Superconductivity in MgB2: Clean or Dirty? (2002)
Mazin, I.I., Andersen, O.K., Jepsen, O., Dolgov, O.V., Kortus, J., Golubov, A., ...
A large number of experimental facts and theoretical arguments favor a two-gap model for superconductivity in MgB2. However, this model predicts strong suppression of the critical temperature by...
Multiband model for tunneling in MgB2 junctions (2002)
Brinkman, A., Golubov, A., Rogalla, H., Dolgov, O.V., Kortus, J., Kong, Y., ...
A theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2-based junctions. The gap functions in different bands in MgB2 are obtained...
Multiband model for penetration depth in MgB2 (2002)
Golubov, A., Brinkman, A., Dolgov, O.V., Kortus, J., Jepsen, O.
The results of first-principles calculations of the electronic structure and the electron-phonon interaction in MgB2 are used to study theoretically the temperature dependence and anisotropy of the...
Multiband model for penetration depth in MgB2 (2002)
Golubov, A. A., Brinkman, A., Dolgov, O. V., Kortus, J., Jepsen, O.
The results of first-principles calculations of the electronic structure and the electron-phonon interaction in MgB2 are used to study theoretically the temperature dependence and anisotropy of the...
Superconductivity in MgB2: Clean or Dirty? (2002)
Mazin, I. I., Andersen, O. K., Jepsen, O., Dolgov, O. V., Kortus, J., Golubov, A. A., ...
A large number of experimental facts and theoretical arguments favor a two-gap model for superconductivity in MgB2. However, this model predicts strong suppression of the critical temperature by...
Koitzsch, A., Fink, J., Golden, M. S., Karlsson, K., Jepsen, O., Gunnarsson, O., ...
We have studied the core level photoemission spectra of the two-dimensional cuprates Sr2CuO2Cl2, Sr2CuO2Br2, Ca2CuO2Cl2, Bi2Sr2CaCu2O8+delta, and Nd2CuO4, with particular focus on the screening...
Contact field trend in hole-doped cuprates (2002)
Pavarini, E., Jepsen, O., Andersen, O. K.
We show that, in hole-doped superconductors, the contact field at Cu site (Cuo(2)-plane) is controlled essentially by the energy of the so-called axial-orbital, a hybrid between Cu 4s, apical...
Multiband model for tunneling in MgB2 junctions (2002)
Brinkman, A., Golubov, A. A., Rogalla, H., Dolgov, O. V., Kortus, J., Kong, Y., ...
A theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2- based junctions. The gap functions in different bands in MgB2 are obtained...
Specific heat of MgB2 in a one- and a two-band model from first-principles calculations (2002)
Golubov, A. A., Kortus, J., Dolgov, O. V., Jepsen, O., Kong, Y., Andersen, O. K., ...
The heat capacity anomaly at the transition to superconductivity of the layered superconductor MgB2 is compared to first-principles calculations with the Coulomb repulsion, mu*, as the only parameter...
Superconductivity in MgB2: Clean or Dirty? (2002)
Mazin, I.I., Andersen, O.K., Jepsen, O., Dolgov, O.V., Kortus, J., Golubov, Dr. A., ...
A large number of experimental facts and theoretical arguments favor a two-gap model for superconductivity in MgB2. However, this model predicts strong suppression of the critical temperature by...
Multiband model for tunneling in MgB2 junctions (2002)
Brinkman, Dr. Ir. A., Golubov, Dr. A., Rogalla, Prof. H., Dolgov, O.V., Kortus, J., Kong, Y., ...
A theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2-based junctions. The gap functions in different bands in MgB2 are obtained...
Multiband model for penetration depth in MgB2 (2002)
Golubov, Dr. A., Brinkman, Dr. Ir. A., Dolgov, O.V., Kortus, J., Jepsen, O.
The results of first-principles calculations of the electronic structure and the electron-phonon interaction in MgB2 are used to study theoretically the temperature dependence and anisotropy of the...
Superconductivity in MgB2: Clean or Dirty? (2002)
Mazin, I.I., Andersen, O.K., Jepsen, O., Dolgov, O.V., Kortus, J., Golubov, A.A., ...
A large number of experimental facts and theoretical arguments favor a two-gap model for superconductivity in MgB2. However, this model predicts strong suppression of the critical temperature by...
Multiband model for tunneling in MgB2 junctions (2002)
Brinkman, A., Golubov, A.A., Rogalla, H., Dolgov, O.V., Kortus, J., Kong, Y., ...
A theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2-based junctions. The gap functions in different bands in MgB2 are obtained...
Multiband model for penetration depth in MgB2 (2002)
Golubov, A.A., Brinkman, A., Dolgov, O.V., Kortus, J., Jepsen, O.
The results of first-principles calculations of the electronic structure and the electron-phonon interaction in MgB2 are used to study theoretically the temperature dependence and anisotropy of the...
Specific heat of MgB$_2$ in a one- and a two-band model from first-principles calculations (2001)
Golubov, A. A., Kortus, J., Dolgov, O. V., Jepsen, O., Kong, Y., Andersen, O. K., ...
The heat capacity anomaly at the transition to superconductivity of the layered superconductor MgB$_2$ is compared to first-principles calculations with the Coulomb repulsion, $\mu^\ast$, as the only...
Multiband model for tunneling in MgB2 junctions (2001)
Brinkman, A., Golubov, A. A., Rogalla, H., Dolgov, O. V., Kortus, J., Kong, Y., ...
A theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2-based junctions. The gap functions in different bands in MgB2 are obtained...
Electron-phonon interaction in the normal and superconducting states of MgB2 (2001)
Kong, Y., Dolgov, O. V., Jepsen, O., Andersen, O. K.
For the 40K-superconductor MgB2 we have calculated the electronic and phononic structures and the electron-phonon interaction throughout the Brillouin zone ab initio. In contrast to the isoelectronic...
Structure and chemical bonding of UAuGe (2001)
Gibson, B. J., Kremer, R. K., Jepsen, O., Garrett, J. D., Hoffmann, R. D., Pöttgen, R.
Information from photoemission spectral weights and shapes (2001)
Gunnarsson, O., Schönhammer, K., Allen, J. W., Karlsson, K., Jepsen, O.
Band-Structure Trend in Hole-Doped Cuprates and Correlation with Tcmax (2001)
Pavarini, E., Dasgupta, I., Saha-Dasgupta, T., Jepsen, O., Andersen, O. K.
Quasiparticles in d-wave superconductors within density functional theory (2001)
Szotek, Z., Gyorffy, B. L., Temmerman, W. M., Andersen, O. K., Jepsen, O.
Quasiparticles in d-wave superconductors within density functional theory (2001)
Szotek, Z, Gyorffy, BL, Temmerman, W M, Andersen, OK, Jepsen, O
Band-structure trend in hole-doped cuprates and correlation with Tcmax (2000)
Pavarini, E., Dasgupta, I., Saha-Dasgupta, T., Jepsen, O., Andersen, O. K.
By calculation and analysis of the bare conduction bands in a large number of hole-doped high-temperature superconductors, we have identified the energy of the so-called axial-orbital as the...
Kobayashi, K., Fujimori, A., Ohtani, T., Dasgupta, I., Jepsen, O., Andersen, O. K.
We have studied the electronic structure of two Chevrel-phase compounds, Mo$_6$Se$_{7.5}$ and Sn$_{1.2}$Mo$_6$Se$_{7.5}$, by combining photoemission spectroscopy and band-structure calculations....
Under pressure cesium undergoes a transition from a high-pressure fcc phase (Cs-II) to a collapsed fcc phase (Cs-III) near 4.2GPa. At 4.4GPa there follows a transition to the tetragonal Cs-IV phase....
Kondo resonance behavior of heavy fermion f-electron materials (2000)
Allen, J. W., Gweon, G. H., Schek, H. T., Liu, L. Z., Tjeng, L. H., Park, J. H., ...
Developing the MTO formalism (2000)
Andersen, O. K., Saha-Dasgupta, T., Tank, R. W., Arcangeli, C., Jepsen, O., Krier, G.
Optical interband spectra and band structure of Ru2Si3 and Ru2Ge3 (2000)
Henrion, W., Rebien, M., Birdwell, A. G., Antonov, V. N., Jepsen, O.
Developing the MTO Formalism (1999)
Andersen, O. K., Saha-Dasgupta, T., Tank, R. W., Arcangeli, C., Jepsen, O., Krier, G.
We review the simple linear muffin-tin orbital method in the atomic-spheres approximation and a tight-binding representation (TB-LMTO-ASA method), and show how it can be generalized to an accurate...