Novel In-Gap Spin State in Zn-DopedLa1.85Sr0.15Cu

Hiroyuki Kimura

¹

,

Maiko Kofu

²

,

Yuji Matsumoto

³

et al.

Abstract

Low-energy spin excitations of La(1.85)Sr(0.15)Cu(1-y)Zn(y)O4 were studied by neutron scattering. In y=0.004, the incommensurate magnetic peaks show a well-defined "spin gap" below T(c). The magnetic signals at omega=3 meV decrease below T(c)=27 K for y=0.008, also suggesting the gap opening. At lower temperatures, however, the signal increases again, implying a novel in-gap spin state. In y=0.017, the spin gap vanishes and elastic magnetic peaks appear. These results clarify that doped Zn impurities induce the novel in-gap state, which becomes larger and more static with increasing Zn.

Evidence for an incommensurate magnetic resonance inLa2−xSrxCuOTranquada1, Lee2, Yamada3 et al. 2004Phys. Rev. B858972View full textAdd to dashboardCite

“…18 For our slightly overdoped sample, it appears that the field causes weight to shift into the gap from higher energy, causing the frequency dependence to become more like that of the normal state just above T c . These results are compared with a recent study 19 of Zn-doped La 1.85 Sr 0.15 CuO 4 .…”

d-Wave superconductivity as a catalyst for antiferromagnetism in underdoped cuprates

“…When these droplets come close enough to interact, there is a tendency to form incommensurate, phase-coherent Néel domains whose size is sufficient to explain the observations by Lake et al [2] in zero field [12]. Such a model explains the empirical observations that both increasing disorder [17] and underdoping [9] enhance the SDW order.In this paper, we investigate the origin of the 'order by disorder' phenomenon described in [12], as well as the T evolution of the disordered magnetic state in applied magnetic field. An apparently very natural approach to the problem was developed by Demler et al [18], who constructed a Ginzburg-Landau (GL) theory for competing SDW and SC order in a magnetic field.…”

“…When these droplets come close enough to interact, there is a tendency to form incommensurate, phase-coherent Néel domains whose size is sufficient to explain the observations by Lake et al [2] in zero field [12]. Such a model explains the empirical observations that both increasing disorder [17] and underdoping [9] enhance the SDW order.…”

Stripe order in superconducting La2−xBaxCuOHücker1, Zimmermann2, Gu3 et al. 2011Phys. Rev. B305434112View full textAdd to dashboardCite

“…While earlier studies have focussed mainly on reflections at low ℓ such as (2±2δ,0,0.5), 13,14,64 it was realized in more recent works that strong CO reflections can also be found at higher ℓ such as ℓ = 5.5 and 8.5. 20,65,66 A conclusive analysis presented by Kim et al in Ref.…”