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Surface Superconductivity in the type II Weyl Semimetal TaIrTe4
Ying Xing, Zhibin Shao, Jun Ge +12
The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically n…
Non-rigid band shift and non-monotonic electronic structure changes upon doping in the normal state of the pnictide high temperature superconductor Ba2(Fe1-xCox)2As2
PPaolo Vilmercati, Sung-Kwan Mo, Alexei Fedorov +8
We report systematic Angle Resolved Photoemission (ARPES) experiments using different photon polarizations and experimental geometries and find that the doping evolution of the nor…
SR and magnetometry study of superconducting 5% Pt doped IrTe
M. N. Wilson, T. Medina, T. J. Munsie +7
We present magnetometry and muon spin rotation (SR) measurements of the superconducting dichalcogenide IrPtTe. From both sets of measurements we calculate…
Surface terminations and layer-resolved spectroscopy in 122 iron pnictide superconductors
Ang Li, J. -X. Yin, Jihui Wang +13
The surface terminations of 122-type alkaline earth metal iron pnictides AEFe2As2 (AE = Ca, Ba) are investigated with scanning tunneling microscopy/spectroscopy (STM/STS). Cleaving…
Fragile structural transition in Mo3Sb7
J. -Q. Yan, M. A. McGuire, A. F. May +3
MoSb single crystals lightly doped with Cr, Ru, or Te are studied in order to explore the interplay between superconductivity, magnetism, and the cubic-tetragonal structura…
Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2
N. Sirica, F. Bondino, S. Nappini +6
We report x-ray absorption and photoemission spectroscopy of the electronic structure in the normal state of metallic YFe2Ge2. The data reveal evidence for large fluctuating spin m…
Magnetic and structural transitions in LaNaFeAs single crystals
J. -Q. Yan, S. Nandi, B. Saparov +10
LaNaFeAs single crystals have been grown out of an NaAs flux in an alumina crucible and characterized by measuring magnetic susceptibility, electrical resis…
On infrared pseudogap in cuprate and pnictide high-temperature superconductors
S. J. Moon, Y. S. Lee, A. A. Schafgans +15
We investigate infrared manifestations of the pseudogap in the prototypical cuprate and pnictide superconductors: YBa2Cu3Oy and BaFe2As2 (Ba122) systems. We find remarkable similar…
Zero-Field muSR Search for a Time-Reversal-Symmetry-Breaking Mixed Pairing State in Superconducting Ba1-xKxFe2As2
Z. Lotfi Mahyari, A. Cannell, C. Gomez +6
We report the results of a zero-field muon spin relaxation (ZF-muSR) study of superconducting Ba1-xKxFe2As2 (0.5 < x < 0.9) in search of weak spontaneous internal magnetic fields a…
Absence of structural transition in TM0.5IrTe2 (TM=Mn, Fe, Co, Ni)
J. -Q. Yan, B. Saparov, A. S. Sefat +5
TM-doped IrTe2(TM=Mn, Fe, Co, Ni) compounds were synthesized by solid state reaction. Single crystal x-ray diffraction experiments indicate that part of the doped TM ions (TM=Fe, C…
Doping dependence of the spin excitations in Fe-based superconductors Fe1+yTe1-xSex
A. D. Christianson, M. D. Lumsden, K. Marty +10
The Fe1+yTe1-xSex series of materials is one of the prototype families of Fe-based superconductors. To provide further insight into these materials we present systematic inelastic…
Flux growth and physical properties of Mo3Sb7 single crystals
J. -Q. Yan, M. A. McGuire, A. F. May +4
Millimeter sized single crystals of Mo3Sb7 are grown using the self-flux technique and a thorough characterization of their structural, magnetic, thermal and transport properties i…
Infrared Measurement of the Pseudogap in P-Doped and Co-Doped BaFe2As2 High-Temperature Superconductors
S. J. Moon, A. A. Schafgans, S. Kasahara +10
We report on infrared studies of charge dynamics in a prototypical pnictide system: the BaFe2As2 family. Our experiments have identified hallmarks of the pseudogap state in the BaF…
Neutron Diffraction Study of anomalous negative thermal expansion in non-superconducting PrFe1-xRuxAsO
Yuen Yiu, V. Ovidiu Garlea, Michael A. McGuire +3
Neutron powder diffraction has been used to investigate the structural and magnetic behavior of the isoelectronically doped Fe pnictide material PrFe1-xRuxAsO. Substitution of Ru f…
A direct probe of the variability of Coulomb correlation in Fe-pnictide superconductors
P. Vilmercati, C. Parks Cheney, F. Bondino +9
We use core-valence-valence (CVV) Auger spectra to probe the Coulomb repulsion between holes in the valence band of Fe pnictide superconductors. By comparing the two-hole final sta…
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…
Spatial Inhomogeneity in RFeAsO1-xFx (R =Pr, Nd) Determined from Rare Earth Crystal Field Excitations
E. A. Goremychkin, R. Osborn, C. H. Wang +8
We report inelastic neutron scattering measurements of crystal field transitions in PrFeAsO, PrFeAsO0.87F0.13, and NdFeAsO0.85F0.15. Doping with fluorine produces additional crysta…
Structural and Magnetic Phase Transitions in NdCoAsO under High Pressures
Walter Uhoya, Georgiy M. Tsoi, Yogesh K. Vohra +5
We have investigated structural and magnetic phase transitions under high pressures in a quaternary rare earth transition metal arsenide oxide NdCoAsO compound that is isostructura…
Pressure effects on the transport coefficients of Ba(Fe1-xCox)2As2
S. Arsenijević, R. Gaál, A. S. Sefat +4
We report the temperature dependence of the resistivity and thermoelectric power under hydrostatic pressure of the itinerant antiferromagnet BaFe2As2 and the electron-doped superco…
Anomalous Compressibility Effects and Superconductivity in EuFe2As2 under High Pressures
Walter Uhoya, Georgiy M. Tsoi Yogesh K. Vohra, Michael A. McGuire +4
The crystal structure and electrical resistance of the structurally-layered EuFe2As2 have been studied up to 70 GPa and down to temperature of 10 K, using a synchrotron x-ray sourc…
Effect of annealing on the specific heat of optimally doped Ba(FeCo)As
K. Gofryk, A. S. Sefat, M. A. McGuire +6
We report the temperature dependence of the low-temperature specific heat down to 400 mK of the electron-doped Ba(FeCo)As superconductors. We have mea…
Electronic Structure of CeFeAsO1-xFx (x=0, 0.11/x=0.12) compounds
F. Bondino, E. Magnano, C. H. Booth +14
We report an extensive study on the intrinsic bulk electronic structure of the high-temperature superconductor CeFeAsO0.89F0.11 and its parent compound CeFeAsO by soft and hard x-r…
BaFe2As2 Surface Domains and Domain Walls: Mirroring the Bulk Spin Structure
Guorong Li, Xiaobo He, Ang Li +8
High-resolution scanning tunneling microscopy (STM) measurements on BaFe2As2-one of the parent compounds of the iron-based superconductors-reveals a (1x1) As-terminated unit cell o…
Probing Local Variations of Superconductivity on the Surface of Ba(Fe1-xCox)2As2 Single Crystals
T. -H. Kim, R. Jin, L. R. Walker +9
The spatially resolved electrical transport properties have been studied on the surface of optimally-doped superconducting Ba(Fe1-xCox)2As2 single crystal by using a four-probe sca…