1,672 research outputs found
Thermal conductivity of epitaxial graphene nanoribbons on SiC: effect of substrate
We study the effect of SiC substrate on thermal conductivity of epitaxial
graphene nanoribbons (GNRs) using the nonequilibrium molecular dynamics method.
We show that the substrate has strong interaction with single-layer GNRs during
the thermal transport, which largely reduces the thermal conductivity. The
thermal conductivity characteristics of suspended GNRs are well preserved in
the second GNR layers of bilayer GNR, which has a weak van der Waals
interaction with the underlying structures. The out-of-plane phonon mode is
found to play a critical role on the thermal conductivity variation of the
second GNR layer induced by the underlying structures.Comment: 5 pages, 4 figures, 1 tabl
31P NMR Investigation of the Superconductor LiFeP (Tc = 5 K)
We investigate the static and dynamic spin susceptibility of the 111 type
Fe-based superconductor LiFeP with Tc ~ 5 K through the measurement of Knight
shift 31K and the spin-lattice relaxation rate 1/T1 at 31P site by nuclear
magnetic resonance. The constant 31K, small magnitudes of 1/T1T, along with the
resistivity rho ~ T^2 all point to the weak spin correlations in LiFeP. 1/T1T
display small enhancement toward Tc, indicating that the superconductivity is
intimately correlated with the antiferromagnetic spin fluctuations.Comment: Accepted for publication in EP
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