Entanglement between Muon and 
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 Nuclear Spins as a Probe of Charge Environment

Bonfà, Pietro; Frassineti, Jonathan; Wilkinson, J M; Prando, Giacomo; Isah, Muhammad Maikudi; Wang, Chennan; Spina, Tiziana; Joseph, Boby; Mitrović, Vesna; Renzi, R. De; Blundell, Stephen J.; Sanna, Samuele

doi:10.1103/physrevlett.129.097205

Cited by 4 publications

(3 citation statements)

References 50 publications

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“…The deviation from a purely GKT like spectrum which is accounted for by the exponential term Γ may e.g. originate from the entanglement of the muon with neighboring quadrupolar nuclei 43 , modification of the nuclear positions around the muon due to charge order, or dilute electronic moments. Δ 34 shows a non-monotonous temperature dependence; namely, a peak coinciding with the onset of the charge order, which decreases to a broad minimum before increasing again towards lower temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…3d. Another possible reason for the change of the relaxation rate across T * could be an additional modulation of the lattice structure that slightly alters the nuclear positions around the muon 43 . However, a rough order of magnitude estimate yields that the structural distortions of the order of 0.1 Å for the atoms closest to the muon would be needed to explain the observed effect in the second moment of the measured field distribution.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6

Guguchia,

Gawryluk,

Shin

et al. 2023

Nat Commun

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Charge ordered kagome lattices have been demonstrated to be intriguing platforms for studying the intertwining of topology, correlation, and magnetism. The recently discovered charge ordered kagome material ScV6Sn6 does not feature a magnetic groundstate or excitations, thus it is often regarded as a conventional paramagnet. Here, using advanced muon-spin rotation spectroscopy, we uncover an unexpected hidden magnetism of the charge order. We observe an enhancement of the internal field width sensed by the muon ensemble, which takes place within the charge ordered state. More importantly, the muon spin relaxation rate below the charge ordering temperature is substantially enhanced by applying an external magnetic field. Taken together with the hidden magnetism found in AV3Sb5 (A = K, Rb, Cs) and FeGe kagome systems, our results suggest ubiqitous time-reversal symmetry-breaking in charge ordered kagome lattices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6

Guguchia,

Gawryluk,

Shin

et al. 2023

Nat Commun

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show abstract

“…The F-µ-F structure has attracted new interest in the study of entangled quantum states. [21,21] The spin of µ + is strongly coupled with the spin of the magnetic nuclei in the material (especially the two nearest fluorine nuclei), and the polarization of µ + then evolves in the material according to the dipole-dipole Hamiltonian…”

Section: µ µ µSr Study Of Ionic Fluoridesmentioning

confidence: 99%

F-μ bond length and μSR depolarization spectrum calculation for fluoride using two-component density functional theory

et al. 2023

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First-principles calculation of muons in ionic fluorides has been proposed recently. However, there is a considerable difference between the obtained F-µ bond length and the experimental data obtained by muon spin relaxation (µSR). Considering that the difference may be caused by ignoring the quantum effect of muons, we use Two-Component Density Functional Theory (TCDFT) to consider the quantized muon and recalculate the bond length and the µSR depolarization spectrum. After testing several muon-electron correlation, we show that TCDFT can give better results than the commonly used “DFT+µ”.

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The quantum muon

Blundell

2023

J. Phys.: Conf. Ser.

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Most muon spin rotation (µSR) experiments are based on the coupling between a muon (a quantum, spin- 1 2 particle) and a macroscopic magnetic field, either applied externally (as is often the case for experiments on superconductors) or produced internally (due to, for example, the alignment of spins in an ordered magnet). This article will review some experiments which have exploited this, essentially classical, interaction, but then will consider cases in which a more intrinsically quantum mechanical approach is needed. In these cases, one cannot ignore the back reaction of the muon’s effect on the system it is probing. It can be profitable to consider the muon as a qubit, evaluating the decoherence of quantum information injected by the muon into the environmental spin system. Experiments focussed on this approach are underpinned by DFT+µ calculations (density functional theory with an included muon) and give rise to an excellent agreement between theory and experiment and open up new ways of using the muon as a probe.

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Entanglement between Muon and I>12 Nuclear Spins as a Probe of Charge Environment

Cited by 4 publications

References 50 publications

Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6

Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6

F-μ bond length and μSR depolarization spectrum calculation for fluoride using two-component density functional theory

The quantum muon

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