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6 papers · 2 filters
Apparatus for high resolution microwave spectroscopy in strong magnetic fields
W. A. Huttema, B. Morgan, P. J. Turner +5
We have developed a low temperature, high-resolution microwave surface impedance probe that is able to operate in high static magnetic fields. Surface impedance is measured by cavi…
Superfluid Density in a Highly Underdoped YBCO Superconductor
D. M. Broun, W. A. Huttema, P. J. Turner +5
The superfluid density rho_s(T) = 1/lambda^2(T) has been measured at 2.64 GHz in highly underdoped YBCO, at 37 dopings with T_c between 3 K and 17 K. Within limits set by the trans…
Electrical transport measurements in the superconducting state of Bi2212 and Tl2201
S. Ozcan, P. J. Turner, J. R. Waldram +3
Precise measurements of the in-plane microwave surface impedance of high-quality single crystals of Bi2212 and Tl2201 are used to probe the relaxation time of nodal quasiparticles…
Field dependence of the vortex core size in a multi-band superconductor
F. D. Callaghan, M. Laulajainen, C. V. Kaiser +1
The magnetic field dependence of the vortex core size in the multi-band superconductor NbSe2 has been determined from muon spin rotation measurements. The spatially extended nature…
Effect of Delocalized Vortex Core States on the Specific Heat of Nb
J. E. Sonier, M. F. Hundley, J. D. Thompson
The magnetic field (B) dependence of the electronic specific heat for a simple BCS type-II superconductor has been determined from measurements on pure niobium (Nb). Contrary to ex…
Screening in anisotropic superfluids and the superfluid density in underdoped cuprates
Matthew J. Case, Igor F. Herbut
We examine the nature of the collective excitations in a strongly anisotropic system of bosons interacting via Coulomb interaction. Such a system has often been used in the past to…