Quantum spin-liquid states in an organic magnetic layer and molecular rotor hybrid

Szirmai, Péter; Meźière, Cécile; Bastien, Guillaume; Wzietek, P.; Batail, Patrick; Martino, Edoardo; Mantulnikovs, Konstantins; Pisoni, Andrea; Riedl, Kira; Cottrell, Stephen P.; Baines, C.; Forró, Lászlø; Náfrádi, Bálint

doi:10.1073/pnas.2000188117

Cited by 7 publications

(6 citation statements)

References 58 publications

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“…In a new class of hybrid organic crystals [EDT-TTF-CONH 2 ] 2 [BABCO] Szirmai et al [594] suggested that a quantum-spin-liquid state is introduced not by frustration -which is only t : t : t = 1.00 : 0.75 : 060 -but mainly by disorder that originates in the molecular rotor BABCO − [595,596]. Despite the rather strong coupling of J ≈ 314 K, the compound does not show indications of a magnetic phase transition down to 20 mK.…”

Section: Randomnessmentioning

confidence: 99%

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Dressel

Tomić

2020

Advances in Physics

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This review provides a perspective on recent developments and their implications for our understanding of novel quantum phenomena in the physics of two-dimensional organic solids. We concentrate on the phase transitions and collective response in the charge sector, the importance of coupling of electronic and lattice degrees of freedom and stress an intriguing role of disorder. After a brief introduction to low-dimensional organic solids and their crystallographic structures, we focus on the dimensionality and interactions and emergent quantum phenomena. Important topics of current research in organic matter with sizeable electronic correlations are Mott metal-insulator phase transitions, charge order and ferroelectricity. Highly frustrated two-dimensional systems are established model compounds for studying the quantum spin liquid state and the competition with magnetic long-range order. There are also unique examples of quantum disordered state of magnetic and electric dipoles. Representative experimental results are complemented by current theoretical approaches.

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Section: Randomnessmentioning

confidence: 99%

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Dressel

Tomić

2020

Advances in Physics

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“…Because of the extended triangular arrangement of spin- 1 / 2 centers in these 2DCPs, such AFM coupling would lead to magnetic frustration, due to the impossibility of having all spin centers antiferromagnetically coupled with their nearest neighbors. Such a frustrated situation makes our proposed 2DCPs purely organic candidates to host unusual magnetically ordered states and, potentially, QSL-based states. − , We note that our strategy could also be applicable to other 2DCPs based on open-shell organic molecular building blocks e.g., triangulenes . Considering different chemical functionalizations of the aryl rings for N-mv-2DCP, we find that the strength of such (frustrated) AFM interactions may be tuned from ca.…”

Section: Discussionmentioning

confidence: 90%

“…Such a frustrated situation makes our proposed 2DCPs purely organic candidates to host unusual magnetically ordered states 36 and, potentially, QSL-based states. [56][57][58]75 We note that our strategy could also be applicable to other 2DCPs based on open-shell organic molecular building blocks e.g., triangulenes. 76 Considering different chemical functionalizations of the aryl rings for N-mv-2DCP, we find that the strength of such (frustrated) AFM interactions may be tuned from ca.…”

Section: ■ Conclusionmentioning

confidence: 97%

Emergent Spin Frustration in Neutral Mixed-Valence 2D Conjugated Polymers: A Potential Quantum Materials Platform

et al. 2023

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Two-dimensional conjugated polymers (2DCPs)organic 2D materials composed of arrays of carbon sp2 centers connected by π-conjugated linkersare attracting increasing attention due to their potential applications in device technologies. This interest stems from the ability of 2DCPs to host a range of correlated electronic and magnetic states (e.g., Mott insulators). Substitution of all carbon sp2 centers in 2DCPs by nitrogen or boron results in diamagnetic insulating states. Partial substitution of C sp2 centers by B or N atoms has not yet been considered for extended 2DCPs but has been extensively studied in the analogous neutral mixed-valence molecular systems. Here, we employ accurate first-principles calculations to predict the electronic and magnetic properties of a new class of hexagonally connected neutral mixed-valence 2DCPs in which every other C sp2 nodal center is substituted by either a N or B atom. We show that these neutral mixed-valence 2DCPs significantly energetically favor a state with emergent superexchange-mediated antiferromagnetic (AFM) interactions between C-based spin-1/2 centers on a triangular sublattice. These AFM interactions are surprisingly strong and comparable to those in the parent compounds of cuprate superconductors. The rigid and covalently linked symmetric triangular AFM lattice in these materials thus provides a highly promising and robust basis for 2D spin frustration. As such, extended mixed-valence 2DCPs are a highly attractive platform for the future bottom-up realization of a new class of all-organic quantum materials, which could host exotic correlated electronic states (e.g., unusual magnetic ordering, quantum spin liquids).

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“…Its possibility of mobile spinons was proposed, and the proximity to Mott boundary indicated that a spinon‐deconfined chargon‐glass insulator might dominate the QSL state. Furthermore, disorder generated by randomly frozen BABCO‐rotors induced the QSL state in EDT‐TTF‐CONH 2 +2 BABCO−(EDT‐BCO), where the cations carrying S = 1/2 spins formed a triangular lattice with spatial anisotropy 212 . The DFT calculation suggested that the anisotropy was not strong enough for dimensionality reduction, and this less frustrating system was expected to show chiral or collinear LRO states.…”

Section: Quantum Spin Liquidsmentioning

confidence: 99%

“…Furthermore, disorder generated by randomly frozen BABCO-rotors induced the QSL state in EDT-TTF-CONH 2 +2 BABCO−(EDT-BCO), where the cations carrying S = 1/2 spins formed a triangular lattice with spatial anisotropy. 212 The DFT calculation suggested that the anisotropy was not strong enough for dimensionality reduction, and this less frustrating system was expected to show chiral or collinear LRO states. However, tests including ESR, NMR, and µSR could not provide evidence for the formation of magnetic order but supported the appearance of a QSL state.…”

Section: Charge Transfer Saltsmentioning

confidence: 99%

Organic quantum materials: A review

Wang

Zhang

2023

SmartMat

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Interests in organic quantum materials (OQMs) have been explosively growing in the field of condensed physics of matter due to their rich chemistry and unique quantum properties. They are strongly correlated systems and show novel electromagnetic performance such as high‐temperature superconducting, quantum sensing, spin electronics, quantum dots, topological insulating, quantum Hall effects, spin liquids, qubits, and so forth, which exhibit promising prospects in information communication and thus facilitate the construction of a modern intelligent society. This article reviews recent developments in the research on the electromagnetic characteristics of OQMs. We mainly give an overview on the progress of superconductors and quantum spin liquids based on organic materials and describe their possible mechanisms. Numerous experimental findings exhibit new exciton interactions and provide insights into exotic electronic properties. Finally, their association and strategies for realizing multiple quantum states in one system are discussed.

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Quantum spin-liquid states in an organic magnetic layer and molecular rotor hybrid

Cited by 7 publications

References 58 publications

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Emergent Spin Frustration in Neutral Mixed-Valence 2D Conjugated Polymers: A Potential Quantum Materials Platform

Organic quantum materials: A review

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