Publications (14)
Revisiting the Cu NMR signature of charge order in LaBaCuO
T. Imai, P. M. Singer, A. Arsenault +1
We use single crystal Cu NMR techniques to revisit the early Cu NQR signature of charge order observed for LaBaCuO (~K) [A.…
Molecular Dynamics Simulations of NMR Relaxation and Diffusion of Bulk Hydrocarbons and Water
P. M. Singer, D. Asthagiri, W. G. Chapman +1
Molecular dynamics (MD) simulations are used to investigate H nuclear magnetic resonance (NMR) relaxation and diffusion of bulk -CH to -CH hydroc…
(63)Cu NQR Evidence for Spatial Variation of Hole Concentration in La(2-x)Sr(x)CuO(4)
P. M. Singer, A. W. Hunt, T. Imai
We report experimental evidence for the spatial variation of hole concentration x_(hole) in the high Tc superconductor La(2-x)Sr(x)CuO(4) (0.04 <= x <= 0.16) by using (63)Cu NQR fo…
Glassy Slowing of Stripe Modulation in (La,Eu,Nd)(2-x)(Sr,Ba)(x)CuO4: A Cu-63 and La-139 NQR Study Down to 350mK
A. W. Hunt, P. M. Singer, A. F. Cederstrom +1
We report a comprehensive Cu and La NQR study down to 350mK in the stripe phase of the hole-doped high temperature superconductors with hole concentration approximately 1/8. We obs…
Distribution of the magnetic environment in charge ordered LaSrCuO
A. Arsenault, T. Imai, P. M. Singer +2
We report the inverse Laplace transform (ILT) analysis of the La nuclear spin-lattice relaxation rate in charge ordered LaSrCuO ($T_{charge}…
NMR Evidence for Gapped Spin Excitations in Metallic Carbon Nanotubes
P. M. Singer, P. Wzietek, H. Alloul +2
We report on the spin dynamics of 13C isotope enriched inner-walls in double-wall carbon nanotubes (DWCNT) using 13C nuclear magnetic resonance (NMR). Contrary to expectations, we…
(13)C NMR investigation of the superconductor MgCNi_3 up to 800K
P. M. Singer, T. Imai, T. He +2
We report (13)C NMR characterization of the new superconductor MgCNi_3 (He et al., Nature (411), 54 (2001)). We found that both the uniform spin susceptibility and the spin fluctua…
{63}Cu NQR Study of the Inhomogeneous Electronic State in La{2-x}Sr{x}CuO{4}
P. M. Singer, A. W. Hunt, T. Imai
We report detailed systematic measurements of the spatial variation in electronic states in the high T{c} superconductor La{2-x}Sr{x}CuO{4} (0.04<= x <= 0.16) using {63}Cu NQR for…
Systematic (63)Cu NQR and (89)Y NMR Study of Spin Dynamics in Y(1-z)Ca(z)Ba(2)Cu(3)O(y) Across Superconductor-Insulator Boundary
P. M. Singer, T. Imai
We demonstrate that the spin dynamics in underdoped Y(1-z)Ca(z)Ba(2)Cu(3)O(y) for y=~6.0 exhibit qualitatively the same behavior to underdoped La(2-x)Sr(x)CuO(4) for an equal amoun…
What has NMR taught us about stripes and inhomogeneity?
P. M. Singer, A. W. Hunt, A. F. Cederstrom +1
The purpose of this brief invited paper is to summarize what we have (not) learned from NMR on stripes and inhomogeneity in La{2-x}Sr{x}CuO{4}. We explain that the reality is far m…
Systematic Cu-63 NQR studies of the stripe phase in La(1.6-x)Nd(0.4)Sr(x)CuO(4) for 0.07 <= x <= 0.25
P. M. Singer, A. W. Hunt, A. F. Cederstrom +1
We demonstrate that the integrated intensity of Cu-63 nuclear quadrupole resonance (NQR) in La(1.6-x)Nd(0.4)Sr(x)CuO(4) decreases dramatically below the charge-stripe ordering temp…
Cu-63 NQR Measurement of Stripe Order Parameter in La(2-x)Sr(x)CuO(4)
A. W. Hunt, P. M. Singer, K. R. Thurber +1
We demonstrate that one can measure the charge-stripe order parameter in the hole-doped CuO(2) planes of La(1.875)Ba(0.125)CuO(4), La(1.48)Nd(0.4)Sr(0.12)CuO(4) and La(1.68)Eu(0.2)…
La NMR investigation of the interplay between the lattice, charge, and spin dynamics in charge ordered high cuprate LaBaCuO
P. M. Singer, A. Arsenault, T. Imai +1
We investigate the interplay between the lattice, charge, and spin dynamics in charge ordered high cuprate LaBaCuO (~K) based on the inver…
Isotope engineering in carbon nanotube systems
F. Simon, Ch. Kramberger, R. Pfeiffer +5
We report on single-wall carbon nanotube (SWCNT) specific C isotope enrichment. The high temperature annealing of isotope enriched fullerenes encapsulated in SWCNTs yields d…