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Two-dimensional nature of superconductivity in the intercalated layered systems LixHfNCl and LixZrNCl: Muon spin relaxation and magnetization measurements

Two-dimensional nature of superconductivity in the intercalated layered systems LixHfNCl and LixZrNCl: Muon spin relaxation and magnetization measurem

Two-dimensional nature of superconductivity in the intercalated layered systems LixHfNCl and LixZrNCl: Muon spin relaxation and magnetization measurements   (Citations: 2)
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T. Ito, Y. Fudamoto, A. Fukaya, I. M. Gat-Malureanu, M. I. Larkin, P. L. Russo, A. Savici, Y. J. Uemura, K. Groves, R. Breslow, K. Hotehama, S. Yamanakahttp://academic.research.microsoft.com/io.ashx?type=5&id=11163883&selfId1=0&selfId2=0&maxNumber=12&query=
We report muon spin relaxation (muSR) and magnetization measurements, together with synthesis and characterization, of the Li-intercalated layered superconductors LixHfNCl and LixZrNCl with/without cointercalation of THF (tetrahydrofuran) or propylene carbonate. The three-dimensional superfluid density ns/m* (superconducting carrier density/effective mass) as well as the two-dimensional superfluid density ns2D/m*ab [two-dimensional (2D) area density of superconducting carriers/ab-plane effective mass] have been derived from the muSR results of the magnetic-field penetration depth lambdaab observed with external magnetic field applied perpendicular to the 2D honeycomb layer of HfN/ZrN. In a plot of Tc versus ns2D/m*ab, most of the results lie close to the linear relationship found for underdoped high-Tc cuprate (HTSC) and layered organic BEDT (bis(ethylenedithio)) superconductors. In LixZrNCl without THF intercalation, the superfluid density and Tc for x=0.17 and 0.4 do not show much difference, reminiscent of muSR results for some overdoped HTSC systems. Together with the absence of dependence of Tc on average interlayer distance among ZrN/HfN layers, these results suggest that the 2D superfluid density ns2D/m*ab is a dominant determining factor for Tc in the intercalated nitride-chloride systems. We also report muSR and magnetization results on depinning of flux vortices, and the magnetization results for the upper critical field Hc2 and the penetration depth lambda. A reasonable agreement was obtained between muSR and magnetization estimates of lambda. We discuss the two-dimensional nature of superconductivity in the nitride-chloride systems based on these results.
Journal: Physical Review B - PHYS REV B , vol. 69, no. 13, 2004
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