Loop currents in two-leg ladder cuprates

Bounoua, Dalila; Mangin-Thro, L.; Jeong, Jaehong; Saint-Martin, R.; Pinsard-Gaudart, L.; Sidis, Y.; Bourges, P.

doi:10.1038/s42005-020-0388-1

Cited by 16 publications

(14 citation statements)

References 46 publications

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“…In spin liquids, the emergence of LC orders in the archetype of doped 1D spin-liquids (hole-doped spin ladders) has been proposed [54]. Our recent results in spin-ladders [37] shows that local discrete symmetries are also broken in 1D spin liquid systems, as it has been theoretically predicted. In other models, based on a PDW state [39,40] or a fractionalized PDW instability [41], the PG is described as a highly fluctuating state, where a preemptive phase breaking both T-and P-symmetries (a LC-like phase) is expected at higher temperature.…”

Section: Loop Currents and Pseudogapsupporting

confidence: 65%

“…This magnetism cannot be described by any type of Cu spins ordering. Instead, our investigations establish the existence of LC correlations within the 2-leg ladders [37]. The results from both studies suggest that LCs could be confined within quasi-1D structures, such as 2-leg Cu ladders, imposed either by the structure of the material in Sr 14−x Ca x Cu 24 O 41 or by an electronic phase segregation yielding the formation of (bond centered-) stripes in La 2−x Sr x CuO 4 .…”

Section: Iuc Spatial Correlationsmentioning

confidence: 60%

“…However, owing to the formation of degenerate domains and assuming equal populations of the domains, PND cannot distinguish between these different magnetic models, see e.g. our results in 2-leg ladder cuprates [37]. Other techniques can provide information on the R-symmetry breaking.…”

Section: Rotational Symmetry Breakingmentioning

confidence: 79%

“…This aperiodic system hosts a very rich phase diagram where, depending on the Ca content (which induces hole doping), it exhibits a strong spin liquid state ending into an intriguing ordered magnetic state at larger Ca content, passing through a CDW phase. Using PND, we discovered the existence of 2D short range magnetism in this material for two Ca contents [37]. This magnetism cannot be described by any type of Cu spins ordering.…”

Section: Iuc Spatial Correlationsmentioning

confidence: 90%

“…evidence in favor of the LC states in various quantum materials, and which experimentalists have tried to evidence by using dichroic effect using circularly polarized angle resolved photoemission (ARPES) [32] and next by looking for the LC induced orbital magnetism using polarized neutron diffraction (PND) as we shall review here in Section 2. To date, the LC state has been reported in several oxide materials either with 2D structure, in the superconducting cuprates [6,[11][12][13][14][15][16][17][33][34][35] and in the iridates [36], or in the 1D spin ladder cuprate [37], showing the universal nature of this exotic state.…”

Section: Introductionmentioning

confidence: 99%

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Loop currents in quantum matter

Bourgès¹,

Bounoua²,

Sidis³

2022

Comptes Rendus. Physique

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In many quantum materials, strong electron correlations lead to the emergence of new states of matter. In particular, the study in the last decades of the complex phase diagram of high temperature superconducting cuprates highlighted intra-unit-cell electronic instabilities breaking discrete Ising-like symmetries, while preserving the lattice translation invariance. Polarized neutron diffraction experiments have provided compelling evidences supporting a new form of intra-unit-cell magnetism, emerging concomitantly with the so-called pseudogap state of these materials. This observation is currently interpreted as the magnetic hallmark of an intra-unit-cell loop current order, breaking both parity and time-reversal symmetries. More generally, this magneto-electric state is likely to exist in a wider class of quantum materials beyond superconducting cuprates. For instance, it has been already observed in hole-doped Mott insulating iridates or in the spin liquid state of hole-doped 2-leg ladder cuprates.

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Section: Loop Currents and Pseudogapsupporting

confidence: 65%

Section: Iuc Spatial Correlationsmentioning

confidence: 60%

Section: Rotational Symmetry Breakingmentioning

confidence: 79%

Section: Iuc Spatial Correlationsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Loop currents in quantum matter

Bourgès¹,

Bounoua²,

Sidis³

2022

Comptes Rendus. Physique

Self Cite

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Unveiling unconventional magnetism at the surface of Sr2RuO4

et al. 2021

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Materials with strongly correlated electrons often exhibit interesting physical properties. An example of these materials is the layered oxide perovskite Sr2RuO4, which has been intensively investigated due to its unusual properties. Whilst the debate on the symmetry of the superconducting state in Sr2RuO4 is still ongoing, a deeper understanding of the Sr2RuO4 normal state appears crucial as this is the background in which electron pairing occurs. Here, by using low-energy muon spin spectroscopy we discover the existence of surface magnetism in Sr2RuO4 in its normal state. We detect static weak dipolar fields yet manifesting at an onset temperature higher than 50 K. We ascribe this unconventional magnetism to orbital loop currents forming at the reconstructed Sr2RuO4 surface. Our observations set a reference for the discovery of the same magnetic phase in other materials and unveil an electronic ordering mechanism that can influence electron pairing with broken time reversal symmetry.

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Signatures of a surface spin–orbital chiral metal

Mazzola,

Brzezicki,

Mercaldo

et al. 2024

Nature

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The relation between crystal symmetries, electron correlations and electronic structure steers the formation of a large array of unconventional phases of matter, including magneto-electric loop currents and chiral magnetism1–6. The detection of such hidden orders is an important goal in condensed-matter physics. However, until now, non-standard forms of magnetism with chiral electronic ordering have been difficult to detect experimentally7. Here we develop a theory for symmetry-broken chiral ground states and propose a methodology based on circularly polarized, spin-selective, angular-resolved photoelectron spectroscopy to study them. We use the archetypal quantum material Sr2RuO4 and reveal spectroscopic signatures that, despite being subtle, can be reconciled with the formation of spin–orbital chiral currents at the surface of the material8–10. As we shed light on these chiral regimes, our findings pave the way for a deeper understanding of ordering phenomena and unconventional magnetism.

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Loop currents in two-leg ladder cuprates

Cited by 16 publications

References 46 publications

Loop currents in quantum matter

Loop currents in quantum matter

Unveiling unconventional magnetism at the surface of Sr2RuO4

Signatures of a surface spin–orbital chiral metal

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