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Strässle, S.; Roos, J.; Mali, M.; Keller, H.; Ohno, Takashi

doi:10.1103/physrevlett.101.237001

Cited by 30 publications

(31 citation statements)

References 20 publications

(24 reference statements)

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“…This relation shows that an extended object (assume, as an example, that R ∼ L/4, such that for L ∼ 3.0 nm, R ∼ 0.75 nm) can have a large magnetic moment, µ ∼ 0.01 µ B , attached to a very weak field, h 3 ∼ 0.02 mT. This magnetic field and magnetic moment is in the threshold limit of local fields from dynamical currents measured by NMR/NQR 21,22 and by µSR 23,24 measurements. Because of the elaborate circulating currents, the skyrmion lattice manifests itself as a periodic charge arrangement.…”

Section: Structure Of the Skyrmion Latticementioning

confidence: 99%

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Evidence for Skyrmions in the High-Temperature Superconductors

Vargas-Paredes

Cariglia

Doria

et al. 2013

J Supercond Nov Magn

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We claim that the charge density wave recently found by resonant soft x-ray scattering in layered copper oxides is the tetragonal symmetry defined by the distance between neighbor Cu 3+ ions in the CuO2 layer that determines the critical temperature. We find evidence that this tetragonal symmetry is a skyrmionic state, which is responsible for an unusual magnetic order and charge flow in the layers that leads to the breaking of the time reversal symmetry below the pseudogap line. The core of the skyrmions form pockets of local magnetic field piercing the superconducting layers in opposite direction to the rest of the unit cell.

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Section: Structure Of the Skyrmion Latticementioning

confidence: 99%

“…Indeed it is fundamental to estimate the value of h since NMR/NQR 21,22 and µSR 23,24 experiments put several bounds on its maximum value. An estimate of the maximum modules of h 3 can be obtained by calculating its value at the center of the skyrmion.…”

Section: Structure Of the Skyrmion Latticementioning

confidence: 99%

Evidence for Skyrmions in the High-Temperature Superconductors

Vargas-Paredes

Cariglia

Doria

et al. 2013

J Supercond Nov Magn

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“…The current state of knowledge about OCs is thus contradictory. Local magnetic fields must inevitably arise from OCs, but no evidence for additional fields was found using yttrium nuclear magnetic resonance (NMR) [16] and muon spin rotation [13,17], despite the pronounced sensitivity of these direct methods for weak local magnetic fields.…”

mentioning

confidence: 99%

Absence of Orbital Currents in SuperconductingYBa2Cu4O8Using a Zeeman-Perturbed Nuclear-Quadrupole-Resonance Technique

et al. 2011

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“…On the experimental front specific signatures compatible with uniform currents where observed [12][13][14][15] even if the issue is still controversial. 16,17 On the theoretical side significant efforts were made to probe the possible existence of such a phase, either using numerical approaches [18][19][20] or starting from Mott insulating side. 21 As a way of investigating the physics of these states in a more controlled way and also in view of possible connections with experimental systems, [22][23][24][25][26] phases exhibiting orbital current patterns ͑OCP͒ were also considered in the context of two-leg ladders.…”

Section: Introductionmentioning

confidence: 99%

Spin rotational symmetry breaking by orbital current patterns in two-leg ladders

Chudziński¹,

Gabay²,

Giamarchi³

2010

Phys. Rev. B

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We investigate the physical consequences of orbital current patterns ͑OCP͒ in doped two-leg Cu-O Hubbard ladders. The internal symmetry of the pattern, in the case of the ladder structure, differs slightly from that suggested so far for cuprates. We focus on this OCP and look for measurable signatures of its existence. We compute the magnetic field produced by the OCP at each lattice site and estimate its value in view of a possible experimental detection. Using a renormalization-group ͑RG͒ analysis, we determine the changes that are caused by the SU͑2͒ spin rotational symmetry breaking which occurs when the OCP is present in the groundstate phase diagram. The most significant one is an in-plane spin-density wave gap opening in an otherwise critical phase, at intermediate dopings. We estimate the value of this gap, give an analytic expression for the correlation functions and examine some of the magnetic properties of this new phase which can be revealed in measurements. We compute the conductance in the presence of a single impurity using an RG analysis. A discussion of the various sources of SU͑2͒ symmetry breaking underscores the specificity of the OCP-induced effects.

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Lack of Evidence for Orbital-Current Effects in the High-TemperatureY2Ba4Cu7O15−δSuperconductor using

Cited by 30 publications

References 20 publications

Evidence for Skyrmions in the High-Temperature Superconductors

Evidence for Skyrmions in the High-Temperature Superconductors

Absence of Orbital Currents in SuperconductingYBa2Cu4O8Using a Zeeman-Perturbed Nuclear-Quadrupole-Resonance Technique

Spin rotational symmetry breaking by orbital current patterns in two-leg ladders

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