Kurter, C., Ozyuzer, L., Proslier, T., Zasadzinski, J. F., Hinks, D. G., Gray, K. E.
Anomalously high and sharp peaks in the conductance of intrinsic Josephson junctions in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi2212) mesas have been universally interpreted as superconducting...
Emission of Terahertz Waves from Stacks of Intrinsic Josephson Junctions (2009)
Gray, K. E., Ozyuzer, L., Koshelev, A. E., Kurter, C., Kadowaki, K., Yamamoto, T., ...
By patterning mesoscopic crystals of Bi2Sr2CaCu2O8 (BSCCO) into electromagnetic resonators the oscillations of a large number of intrinsic Josephson junctions can be synchronized into a macroscopic...
Thermal Management in Large Bi2212 Mesas used for Terahertz Sources (2009)
Kurter, C., Gray, K. E., Zasadzinski, J. F., Ozyuzer, L., Koshelev, A. E., Li, Q., ...
We present a thermal analysis of a patterned mesa on a Bi2Sr2CaCu2O8 (Bi2212) single crystal that is based on tunneling characteristics of the c-axis stack of ~800 intrinsic Josephson junctions in...
Proslier, T., Zasadzinski, J., Moore, J., Pellin, M., Elam, J., Cooley, L., ...
A method to treat the surface of Nb is described which potentially can improve the performance of superconducting RF cavities. We present tunneling and x-ray photoemission spectroscopy (XPS)...
Tunneling study of cavity grade Nb: possible magnetic scattering at the surface (2008)
Proslier, T., Zasadzinski, J. F., Cooley, L., Antoine, C., Moore, J., Pellin, M., ...
Tunneling spectroscopy was performed on Nb pieces prepared by the same processes used to etch and clean superconducting radio frequency (SRF) cavities. Air exposed, electropolished Nb exhibited a...
Jin-tae Kim, Y. K. Park, W. N. Kang, C. W. Chu, H. R. Lim, ...
Abstract-- The effect of columnar defects on the critical dynamics of superconducting Tl2Ba2CaCu2O8 (Tl-2212) film has been investigated. The Tl-2212 film was irradiated at 0 ° C by 1.3 GeV U-ions...
Characteristic Energy of the Coulomb Interactions and the Pileup of States (2007)
Mazur, Daniel, Gray, K. E., Zasadzinski, J. F., Ozyuzer, L., Beloborodov, I. S., Zheng, H., ...
Tunneling data on $\mathrm{La_{1.28}Sr_{1.72}Mn_2O_7}$ crystals confirm Coulomb interaction effects through the $\sqrt{\mathrm{E}}$ dependence of the density of states. Importantly, the data and...
Reentrant Orbital Order and the True Ground State of LaSr2Mn2O7 (2007)
Li, Qing'An, Gray, K. E., Zheng, H., Claus, H., Rosenkranz, S., Ancona, S. Nyborg, ...
Contrary to conventional wisdom, our purified La2-2xSr1+2xMn2O7 crystals exhibit CE-type orbital and charge order as the low-temperature ground state for a hole doping level h = 0.5. For small...
Kurter, C., Mazur, D., Ozyuzer, L., Hinks, D. G., Gray, K. E.
Interlayer tunneling spectroscopy measurements were performed on mesa arrays of Bi-2212 single crystals, intercalated with HgBr$_2$. Tunneling conductances were obtained over a wide temperature range...
Evidence of Strong-Coupled Superconductivity in CaC6 from Tunneling Spectroscopy (2006)
Kurter, C., Ozyuzer, L., Mazur, Daniel, Zasadzinski, J. F., Rosenmann, D., Claus, H., ...
Point-contact tunneling on CaC$_6$ crystals reproducibly reveals superconducting gaps, $\Delta$, of 2.3$\pm$0.2 meV which are $\sim$~40% larger than earlier reports. That puts CaC$_6$ into the class...
Tunneling spectroscopy of Tl2Ba2CaCu2O8 single crystals and thin films (2006)
Mazur, Daniel, Zasadzinski, J. F., Gray, K. E., Ma, Y. C., Wang, N. L., Yan, S. L.
Early electron tunneling experiments with the Tl2Ba2CaCu2O8 measured \Delta = 16-28 meV, while bulk optical experiments measured \Delta = 43-45 meV. We report new tunneling measurements of...
Suppressed Magnetization at the Surfaces and Interfaces of Ferromagnetic Metallic Manganites (2006)
Freeland, J. W., Kavich, J. J., Gray, K. E., Ozyuzer, L., Zheng, H., Mitchell, J. F., ...
What happens to ferromagnetism at the surfaces and interfaces of manganites? With the competition between charge, spin, and orbital degrees of freedom, it is not surprising that the surface behavior...
Zasadzinski, J. F., Ozyuzer, L., Coffey, L., Gray, K. E., Hinks, D. G., Kendziora, C.
A d-wave, Eliashberg analysis of break junction and STM tunneling spectra on BiSrCaCuO (Bi2212) reveals that a spectral dip feature is directly linked to strong electronic coupling to a narrow boson...
Freeland, J. W., Gray, K. E., Ozyuzer, L., Berghuis, P., Badica, Elvira, Kavich, J., ...
Transmission of information using the spin of the electron as well as its charge requires a high degree of spin polarization at surfaces. At surfaces however this degree of polarization can be...
Single Junction and Intrinsic Josephson Junction Tunneling Spectroscopies of Bi2Sr2CaCu2O8+d (2004)
Ozyuzer, L., Kurter, C., Zasadzinski, J. F., Gray, K. E., Hinks, D. G., Miyakawa, N.
Tunneling spectroscopy measurements are reported on optimally-doped and overdoped Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ single crystals. A novel point contact method is used to obtain...
Retention of Two-Band Superconductivity in Highly Carbon-Doped MgB2 (2003)
Schmidt, H., Gray, K. E., Hinks, D. G., Zasadzinski, J. F., Avdeev, M., Jorgensen, J. D., ...
Tunneling data on MgB_{1.8}C_{0.2} show a reduction in the energy gap of the pi-bands by a factor of two from undoped MgB2 that is consistent with the Tc reduction, but inconsistent with the...
Probing the Phase Diagram of Bi2Sr2CaCu2O8+d with Tunneling Spectroscopy (2003)
Ozyuzer, L., Zasadzinski, J. F., Gray, K. E., Hinks, D. G., Miyakawa, N.
Tunneling measurements are performed on Ca-rich single crystals of Bi2Sr2CaCu2O8+d (Bi2212), with various oxygen doping levels, using a novel point contact method. At 4.2 K, SIN and SIS tunnel...
Break-Junction Tunneling on MgB_2 (2002)
Schmidt, H., Zasadzinski, J. F., Gray, K. E., Hinks, D. G.
Tunneling data on magnesium diboride, MgB_2, are reviewed with a particular focus on superconductor-insulator-superconductor (SIS) junctions formed by a break-junction method. The collective...
Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2 (2001)
Schmidt, H., Zasadzinski, J. F., Gray, K. E., Hinks, D. G.
Superconductor-insulator-superconductor tunnel junctions have been fabricated on MgB2 that display Josephson and quasiparticle currents. These junctions exhibit a gap magnitude, Delta~2.5 meV, that...
Correlation of Tunneling Spectra in Bi2Sr2CaCu2O(8+delta) with the Resonance Spin Excitation (2001)
Zasadzinski, J. F., Ozyuzer, L., Miyakawa, N., Gray, K. E., Hinks, D. G., Kendziora, C.
New break-junction tunneling data are reported in Bi2Sr2CaCu2O(8+delta) over a wide range of hole concentration from underdoped (Tc = 74 K) to optimal doped (Tc = 95 K) to overdoped (Tc = 48 K). The...
Correlation of Tunneling Spectra in Bi2Sr2CaCu2O8 + delta with the Resonance Spin Excitation (2001)
Gray, K. E., Hinks, D. G., Miyakawa, N., Ozyuzer, L., Zasadzinski, J. F.
Tunneling Spectroscopy of Tl2Ba2CuO6 (1999)
Ozyuzer, L., Yusof, Z., Zasadzinski, J. F., Hinks, D. G., Gray, K. E.
New results from tunneling spectroscopies on near optimally-doped single crystals of Tl_{2}Ba_{2}CuO_{6} (Tl-2201) junctions are presented. The superconductor-insulator-normal metal (SIN) tunnel...
Welp, U., Berger, A., Miller, D. J., Vlasko-Vlasov, V. K., Gray, K. E., Mitchell, J. F.
Magnetic field induced transitions in the antiferromagnetic layered manganite La1.4Sr1.6Mn2O7 were studied using magnetization measurements and a high-resolution magneto-optical imaging technique. We...
Li, Q. A., Gray, K. E., Mitchell, J. F., Berger, A., Osgood, R.
Experimental evidence supports the double-exchange (DE) mechanism for both in-plane and c-axis conductivity in the colossal-magnetoresistive (CMR) layered manganite La1.4Sr1.6Mn2O7. Below TC, the...
Miyakawa, N., Zasadzinski, J. F., Ozyuzer, L., Guptasarma, P., Hinks, D. G., Kendziora, C., ...
New tunneling data are reported in underdoped Bi2Sr2CaCu2O8-d using superconductor-insulator-superconductor break junctions. Energy gaps, Delta, of 51+2, 54+2 and 57+3 meV are observed for three...
Osborn, R., Rosenkranz, S., Argyriou, D. N., Vasiliu-Doloc, L., Lynn, J. W., Sinha, S. K., ...
Neutron scattering investigations of the paramagnetic correlations in the layered manganite La$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$, which exhibits colossal magnetoresistance above the Curie transition...
Survival after subacute cardiac rupture.
Qureshi, S A, Rissen, T, Gray, K E
A 43-year-old man collapsed suddenly, with pericardial tamponade, seven weeks after an inferior myocardial infarction. Pericardiocentesis disclosed very heavily blood stained fluid. Left ventricular...
Echocardiographic assessment of severity of aortic regurgitation.
An echocardiographic study of left ventricular diameter was made in 27 patients with aortic regurgitation. Comparison was made with a group of 21 normal subjects and a group of 6 patients with large...
Left ventricular to right atrial shunt resulting from infective endocarditis.
Ellis, C J, Gray, K E, Ainscow, D A
A unique case is described in which infective endocarditis of the aortic valve led to intractable heart failure and necropsy examination showed that the patient had developed a communication between...