Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet

Arh, Tina; Gomilšek, M.; Prelovšek, P.; Pregelj, M.; Klanjšek, M.; Ozarowski, Andrew; Clark, S. J.; Lancaster, Tom; Sun, Wei; Mi, Jin‐Xiao; Zorko, A.

doi:10.1103/physrevlett.125.027203

“…We estimate the superexchange strength for the kagome spins in Cu 3 Zn as J ≃ 13 meV by the Curie–Weiss temperature Θ CW = −220 K (Supplementary Note 2 ) 62 . The superexchange interaction for EuCu 3 is about J ≃ 7 meV 53 – 55 . Note the electronic ground state of Eu 3+ in EuCu 3 is the non-magnetic 7 F 0 configuration.…”

Section: Resultsmentioning

confidence: 98%

“…Raman scattering has previously been reported for Herbertsmithite and revealed the multiple spinon scattering process 19 . In recent years, the atacamite family ReCu 3 (OH) 6 Cl 3 (Re=Y, Eu, Sm, and Nd) with the perfect kagome lattice has been synthesized and a chiral 120 ∘ antiferromagnetic (AFM) order with the wave vector q = 0 is identified in the ground state 51 – 55 . The kagome spin systems can be described by the kagome Heisenberg model with the Dzyaloshinski–Moriya (DM) interaction where summation runs over nearest-neighbor bonds 〈 i j 〉, and J and D are the nearest-neighbor exchange and the DM interaction constants, respectively, for the spins S i , j on the i - and j -th sites.…”

Section: Introductionmentioning

confidence: 99%

“…The kagome spin systems can be described by the kagome Heisenberg model with the Dzyaloshinski–Moriya (DM) interaction where summation runs over nearest-neighbor bonds 〈 i j 〉, and J and D are the nearest-neighbor exchange and the DM interaction constants, respectively, for the spins S i , j on the i - and j -th sites. We ignore the in-plane DM interactions regarding to the previous electron paramagnetic resonance measurements in the related kagome systems 55 , 56 . A DM interaction larger than the critical value of ( D / J ) c ~ 0.08 induces a chiral 120° AFM order from the QSL state 57 – 59 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic fingerprint of fractionalized excitations in single-crystalline Cu3Zn(OH)6FBr

Fu

¹

,

Lin

²

,

Wang

³

et al. 2021

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Beyond the absence of long-range magnetic orders, the most prominent feature of the elusive quantum spin liquid (QSL) state is the existence of fractionalized spin excitations, i.e., spinons. When the system orders, the spin-wave excitation appears as the bound state of the spinon-antispinon pair. Although scarcely reported, a direct comparison between similar compounds illustrates the evolution from spinon to magnon. Here, we perform the Raman scattering on single crystals of two quantum kagome antiferromagnets, of which one is the kagome QSL candidate Cu3Zn(OH)6FBr, and another is an antiferromagnetically ordered compound EuCu3(OH)6Cl3. In Cu3Zn(OH)6FBr, we identify a unique one spinon-antispinon pair component in the E2g magnetic Raman continuum, providing strong evidence for deconfined spinon excitations. In contrast, a sharp magnon peak emerges from the one-pair spinon continuum in the Eg magnetic Raman response once EuCu3(OH)6Cl3 undergoes the antiferromagnetic order transition. From the comparative Raman studies, we can regard the magnon mode as the spinon-antispinon bound state, and the spinon confinement drives the magnetic ordering.

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“…(1) devoleps a q = 0 type 120 • AFM order at low temperature in EuCu3. [51][52][53][54][55][56] In terms of the local basis for the AFM order, we rewrite the Hamiltonian as…”

Section: Discussionmentioning

confidence: 99%

“…[19] In recent years, the atacamite family ReCu 3 (OH) 6 Cl 3 (Re = Y, Eu, Sm and Nd) with the perfect kagome lattice has been synthesized and a chiral 120 • antiferromagnetic (AFM) order with the wave vector q = 0 is identified in the ground state. [49][50][51][52][53] The kagome spin systems can be described by the kagome Heisenberg model with the DM interaction…”

Section: Introductionmentioning

confidence: 99%

Dynamic fingerprint of fractionalized excitations in single-crystalline Cu3Zn(OH)6FBr

Fu

¹

,

Lin

²

,

Wang³

et al. 2021

Preprint

View full text Add to dashboard Cite

Beyond the absence of long-range magnetic orders, the most prominent feature of the elusive quantum spin liquid (QSL) state is the existence of fractionalized spin excitations, i.e., spinons. When the system orders, the spin-wave excitation appears as the bound state of the spinon-antispinon pair. Although scarcely reported, a direct comparison between similar compounds illustrates the evolution from spinon to magnon. Here, we perform the Raman scattering on single crystals of two quantum kagome antiferromagnets, of which one is the kagome QSL candidate Cu3Zn(OH)6FBr, and another is an antiferromagnetically ordered compound EuCu3(OH)6Cl3. In Cu3Zn(OH)6FBr, we identify a unique one spinon-antispinon pair component in the E2g magnetic Raman continuum, providing strong evidence for deconfined spinon excitations. In contrast, a sharp magnon peak emerges from the one-pair spinon continuum in the Eg magnetic Raman response once EuCu3(OH)6Cl3 undergoes the antiferromagnetic order transition. From the comparative Raman studies, we can regard the magnon mode as the spinon-antispinon bound state, and the spinon confinement drives the magnetic ordering.

show abstract

Quantum correlation, entanglement in the kagome lattice non-Hermitian quantum systems

Lima

2024

Physica A: Statistical Mechanics and its Applications

0

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Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet

Cited by 32 publications

References 58 publications

Dynamic fingerprint of fractionalized excitations in single-crystalline Cu3Zn(OH)6FBr

Dynamic fingerprint of fractionalized excitations in single-crystalline Cu3Zn(OH)6FBr

Dynamic fingerprint of fractionalized excitations in single-crystalline Cu3Zn(OH)6FBr

Quantum correlation, entanglement in the kagome lattice non-Hermitian quantum systems

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