Two dimensional nature of superconductivity in intercalated layered systems Li$_{x}$HfNCl and Li$_{x}$ZrNCl: muon spin relaxation and magnetization measurements

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dc.creatorIto, T.
dc.creatorFudamoto, Y.
dc.creatorFukaya, A.
dc.creatorGat-Malureanu, I. M.
dc.creatorLarkin, M. I.
dc.creatorRusso, P. L.
dc.creatorSavici, A.
dc.creatorUemura, Y. J.
dc.creatorGroves, K.
dc.creatorBreslow, R.
dc.creatorHotehama, K.
dc.creatorYamanaka, S.
dc.creatorKyriakou, P.
dc.creatorRovers, M.
dc.creatorLuke, G. M.
dc.creatorKojima, K. M.
dc.date2003-10-30
dc.date.accessioned2026-07-07T02:54:31Z
dc.date.available2026-07-07T02:54:31Z
dc.descriptionWe report muon spin relaxation ($μ$SR) and magnetization measurements, together with synthesis and characterization, of the Li-intercalated layered superconductors Li$_{x}$HfNCl and Li$_{x}$ZrNCl with/without co-intercalation of THF (tetrahydrofuran) or PC (propylene carbonate). The 3-dimensional (3-d) superfluid density $n_{s}/m^{*}$ (superconducting carrier density / effective mass), as well as the two dimensional superfluid density $n_{s2d}/m^{*}_{ab}$ (2-dimensional (2-d) area density of superconducting carriers / ab-plane effective mass), have been derived from the $μ$SR results of the magnetic-field penetration depth $λ_{ab}$ observed with external magnetic field applied perpendicular to the 2-d honeycomb layer of HfN / ZrN. In a plot of $T_{c}$ versus $n_{s2d}/m^{*}_{ab}$, most of the results lie close to the linear relationship found for underdoped high-$T_{c}$ cuprate (HTSC) and layered organic BEDT superconductors. In Li$_{x}$ZrNCl without THF intercalation, the superfluid density and $T_{c}$ for $x$ = 0.17 and 0.4 do not show much difference, reminiscent of $μ$SR results for some overdoped HTSC systems. Together with the absence of dependence of $T_{c}$ on average interlayer distance among ZrN / HfN layers, these results suggest that the 2-d superfluid density $n_{s2d}/m^{*}_{ab}$ is a dominant determining factor for $T_{c}$ in the intercalated nitride-chloride systems. We also report $μ$SR and magnetization results on depinning of flux vortices, and the magnetization results for the upper critical field $H_{c2}$ and the penetration depth $λ$. Reasonable agreement was obtained between $μ$SR and magnetization estimates of $λ$. We discuss the two dimensional nature of superconductivity in the nitride-chloride systems based on these results.
dc.description41 pages, 12 color figures, submitted to Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0310736
dc.identifierhttp://arxiv.org/abs/cond-mat/0310736
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22576
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleTwo dimensional nature of superconductivity in intercalated layered systems Li$_{x}$HfNCl and Li$_{x}$ZrNCl: muon spin relaxation and magnetization measurements
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