73 citations · 442 across the 24 of their papers we have counts for
17 papers · 1 filter
Spectroscopic Evidence for the Direct Involvement of Local Moments in the Pairing Process of the Heavy-Fermion Superconductor CeCoIn
K. Shrestha, S. Zhang, L. H. Greene +5
The microscopic mechanism for electron pairing in heavy-fermion superconductors remains a major challenge in quantum materials. Some form of magnetic mediation is widely accepted w…
Design and construction of a point-contact spectroscopy rig with lateral scanning capability
M. Tortello, W. K. Park, C. O. Ascencio +2
The design and realization of a cryogenic rig for point-contact spectroscopy measurements in the needle-anvil configuration is presented. Thanks to the use of two piezoelectric nan…
Temperature-dependent ellipsometry measurements of partial Coulomb energy in superconducting cuprates
J. Levallois, M. K. Tran, D. Pouliot +8
We performed an experimental study of the temperature and doping dependence of the energy-loss function of the bilayer and trilayer Bi-cuprate family. The primary aim is to obtain…
Point contact spectroscopy in the superconducting and normal state of
H. Z. Arham, D. E. Bugaris, D. Y. Chung +2
We use point contact spectroscopy to probe the superconducting and normal state properties of the iron-based superconductor with $\rm{\t…
Andreev Reflection Like Enhancement Above Bulk in Electron Underdoped Iron Arsenides
H. Z. Arham, C. R. Hunt, J. Gillett +5
We use point contact spectroscopy (PCS) to probe the superconducting properties of electron doped () and hole doped…
Point Contact Spectroscopy of Fe Pnictides & Chalcogenides In The Normal State
Hamood Z. Arham, Laura H. Greene
We review the current status of point contact spectroscopy on the iron based superconductors, focusing on their normal state. Point contact spectroscopy is generally used to study…
Design of new superconducting materials, and point contact spectroscopy as a probe of strong electron correlations
Laura H. Greene, Hamood Z. Arham, Cassandra R. Hunt +1
At this centenary of the discovery of superconductivity, the design of new and more useful superconductors remains as enigmatic as ever. These materials play crucial roles both for…
Search for broken time-reversal symmetry near the surface of YBCO films using Beta-NMR
H. Saadaoui, G. D. Morris, Z. Salman +12
Weak spontaneous magnetic fields are observed near the surface of YBCO films using Beta-detected Nuclear Magnetic Resonance. Below Tc, the magnetic field distribution in a silver f…
Phase Separation and Chemical Inhomogeneity in the Iron Chalcogenide Superconductor Fe1+yTexSe1-x
Hefei Hu, J. M. Zuo, J. S. Wen +6
We report investigation on Fe1+yTexSe1-x single crystals by using scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS). Both nonsuperconduc…
Point-contact spectroscopy in heavy-fermion superconductors
Mikael Fogelström, W. K. Park, L. H. Greene +2
We develop a minimal model to calculate point-contact spectra between a metallic tip and a superconducting heavy-fermion system. We apply our tunneling model to the heavy fermion C…
Point-contact spectroscopic studies on normal and superconducting AFe_2As_2-type iron-pnictide single crystals
Xin Lu, W. K. Park, H. Q. Yuan +11
Point-contact Andreev reflection spectroscopy (PCARS) is applied to investigate the gap structure in iron pnictide single crystal superconductors of the AFe_2As_2 (A=Ba, Sr) family…
Andreev reflection and order parameter symmetry in heavy-fermion superconductors: the case of CeCoIn
Wan Kyu Park, Laura H. Greene
We review the current status of Andreev reflection spectroscopy on the heavy fermions, mostly focusing on the case of CeCoIn, a heavy-fermion superconductor with a critical tem…
Andreev reflection spectroscopy of the heavy-fermion superconductor CeCoIn along three different crystallographic orientations
Wan Kyu Park, Laura H. Greene, John L. Sarrao +1
Andreev reflection spectroscopy has been performed on the heavy-fermion superconductor (HFS) CeCoIn single crystals along three different crystallographic orientations, (001),…
Construction of a Cantilever-Andreev-Tunneling rig and its applications to superconductors
Wan Kyu Park, Laura H. Greene
A technique for point-contact spectroscopy, based on an electro-mechanical mechanism for the contact formation, has been developed. It is designed to be used in both He and $^3…
Suppressed Andreev Reflection at the Normal-Metal / Heavy-Fermion Superconductor CeCoIn Interface
Wan Kyu Park, Laura H. Greene, John L. Sarrao +1
Dynamic conductance spectra are taken from Au/CeCoIn point contacts in the Sharvin limit along the (001) and (110) directions. Our conductance spectra, reproducibly obtained ov…
Point-Contact Spectroscopy of the Heavy-Fermion Superconductor CeCoIn
W. K. Park, L. H. Greene, J. L. Sarrao +1
The dynamic conductance of the heavy-fermion superconductor CeCoIn is measured by point-contact spectroscopy as a function of temperature from 60 K down to 400 mK. The contact…
The absence of superfluid response in ac and bc-plane optical conductivities of optimally-doped Bi2212 single crylstals in the surface region
J. J. Tu, C. C. Homes, L. H. Greene +2
The optical properties of optimally-doped Bi_2Sr_2CaCu_2O_{8+δ} (Bi2212) have been measured normal to the edge planes [ac plane, bc plane, and (1\bar{1}0) plane], for light polariz…