Publications (18)
Long range magnetic ordering in NaIrO
X. Liu, T. Berlijn, W. -G. Yin +7
We report a combined experimental and theoretical investigation of the magnetic structure of the honeycomb lattice magnet NaIrO, a strong candidate for a realization of a g…
Experimental observation of the crystallization of a paired holon state
A. Rusydi, W. Ku, B. Schulz +10
A new excitation is observed at 201 meV in the doped-hole ladder cuprate SrCuO, using ultraviolet resonance Raman scattering with incident light at 3.7 eV pola…
Decoupled Pairing Amplitude and Electronic Coherence in Iron-Based Superconductors
H. Miao, W. H. Brito, Z. P. Yin +12
Here we use angle-resolved photoemission spectroscopy to study superconductivity that emerges in two extreme cases, from a Fermi liquid phase (LiFeAs) and an incoherent bad-metal p…
Unusual persistence of superconductivity against high magnetic fields in the strongly-correlated iron-chalcogenide film FeTe:O
I. K. Dimitrov, W. D. Si, W. Ku +2
We report an unusual persistence of superconductivity against high magnetic fields in the iron chalcogenide film FeTe:O below ~ 2.5 K. Instead of saturating like a mean-field…
Relevance of the Heisenberg-Kitaev model for the honeycomb lattice iridates A_2IrO_3
Yogesh Singh, S. Manni, J. Reuther +5
Combining thermodynamic measurements with theoretical density functional and thermodynamic calculations we demonstrate that the honeycomb lattice iridates A2IrO3 (A = Na, Li) are m…
Coexistence of orbital degeneracy lifting and superconductivity in iron-based superconductors
H. Miao, L. -M. Wang, P. Richard +10
In contrast to conventional superconducting (SC) materials, superconductivity in high-temperature superconductors (HTCs) usually emerges in the presence of other fluctuating orders…
On the Nature of Localization in Ti doped Si
Yi Zhang, R. Nelson, K. -M. Tam +7
Intermediate band semiconductors hold the promise to significantly improve the efficiency of solar cells, but only if the intermediate impurity band is metallic. We apply a recentl…
Low-Energy Charge-Density Excitations in MgB: Striking Interplay between Single-Particle and Collective Behavior for Large Momenta
Y. Q. Cai, P. C. Chow, O. D. Restrepo +12
A sharp feature in the charge-density excitation spectra of single-crystal MgB, displaying a remarkable cosine-like, periodic energy dispersion with momentum transfer () a…
Impact of Iron-site defects on Superconductivity in LiFeAs
Shun Chi, Ramakrishna Aluru, Udai Raj Singh +10
In conventional s-wave superconductors, only magnetic impurities exhibit impurity bound states, whereas for an s+- order parameter they can occur for both magnetic and non-magnetic…
Coupling of spin and orbital excitations in the iron-based superconductor FeSe(0.5)Te(0.5)
S. -H. Lee, Guangyong Xu, W. Ku +16
We present a combined analysis of neutron scattering and photoemission measurements on superconducting FeSe(0.5)Te(0.5). The low-energy magnetic excitations disperse only in the di…
Unusual photoemission resonances of oxygen-dopant induced states in BiSrCaCuO
P. Richard, Z. -H. Pan, M. Neupane +7
We have performed an angular-resolved photoemission study of underdoped, optimally doped and overdoped BiSrCaCuO samples using a wide photon energy range (15…
Itinerant electrons, local moments, and magnetic correlations in pnictides high temperature superconductors
P. Vilmercati, A. Fedorov, F. Bondino +11
A direct and element-specific measurement of the local Fe spin moment has been provided by analyzing the Fe 3s core level photoemission spectra in the parent and optimally doped Ce…
Generalized Multiband Typical Medium Dynamical Cluster Approximation: Application to (Ga,Mn)N
Yi Zhang, R. Nelson, Elisha Siddiqui +7
We generalize the multiband typical medium dynamical cluster approximation and the formalism introduced by Blackman, Esterling and Berk so that it can deal with localization in mul…
Covalent bonding and magnetism in cuprates
A. C. Walters, T. G. Perring, J. -S. Caux +5
The importance of covalent bonding for the magnetism of 3d metal complexes was first noted by Pauling in 1931. His point became moot, however, with the success of the ionic picture…
Temperature dependent d-d excitations in manganites probed by resonant inelastic x-ray scattering
S. Grenier, J. P. Hill, V. Kiryukhin +8
We report the observation of temperature dependent electronic excitations in various manganites utilizing resonant inelastic x-ray scattering (RIXS) at the Mn K-edge. Excitations w…
Effect of Number of Walls on Plasmon Behavior in Carbon Nanotubes
M. H. Upton, R. F. Klie, J. P. Hill +8
We investigate the physical parameters controlling the low energy screening in carbon nanotubes via electron energy loss spectroscopy and inelastic x-ray scattering. Two plasmon-li…
Universal quasiparticle decoherence in hole- and electron-doped high-Tc cuprates
Z. -H. Pan, P. Richard, A. V. Fedorov +8
We use angle-resolved photoemission to unravel the quasiparticle decoherence process in the high- cuprates. The coherent band is highly renormalized, and the incoherent part m…
Towards a quantitative description of tunneling conductance of superconductors: application to LiFeAs
A. Kreisel, R. Nelson, T. Berlijn +11
Since the discovery of iron-based superconductors, a number of theories have been put forward to explain the qualitative origin of pairing, but there have been few attempts to make…