Molecular Kondo Chain

DiLullo, Andrew; Chang, Shang‐Hung; Baâdji, N.; Clark, Kendal; Klöckner, Jan-Peter; Prosenc, Marc-Heinrich; Sanvito, Stefano; Wiesendanger, R.; Hoffmann, Germar; Hla, Saw‐Wai

doi:10.1021/nl301149d

Cited by 110 publications

(144 citation statements)

References 39 publications

Supporting

Mentioning

130

Contrasting

Order By: Relevance

“…Furthermore, the advent of scanning tunneling microscopy has made it possible to fabricate artificial Kondo nanostructures with atomic precision [12][13][14][15][16][17][18] whose properties, in particular the onset of lattice effects, have recently been a subject of increasing theoretical attention [19][20][21]. Magnetic atoms or organic molecules with orbital degeneracy deposited onto a metallic surface provide the opportunity to realize an SU(4) symmetric Kondo effect [22].…”

Section: Introductionmentioning

confidence: 99%

Phase diagram and dynamics of the SU(N) symmetric Kondo lattice model

Raczkowski

Assaad

2020

Phys. Rev. Research

View full text Add to dashboard Cite

In heavy-fermion systems, the competition between the local Kondo physics and intersite magnetic fluctuations results in unconventional quantum critical phenomena which are frequently addressed within the Kondo lattice model (KLM). Here we study this interplay in the SU(N ) symmetric generalization of the two-dimensional half-filled KLM by quantum Monte Carlo simulations with N up to 8. While the long-range antiferromagnetic (AF) order in SU(N ) quantum spin systems typically gives way to spin-singlet ground states with spontaneously broken lattice symmetry, we find that the SU(N ) KLM is unique in that for each finite N its ground-state phase diagram hosts only two phases -AF order and the Kondo-screened phase. The absence of any intermediate phase between the N = 2 and large-N cases establishes adiabatic correspondence between both limits and confirms that the large-N theory is a correct saddle point of the KLM fermionic path integral and a good starting point to include quantum fluctuations. In addition, we determine the evolution of the single-particle gap, quasiparticle residue of the doped hole at momentum (π, π), and spin gap across the magnetic order-disorder transition. Our results indicate that increasing N modifies the behavior of the coherence temperature: while it evolves smoothly across the magnetic transition at N = 2 it develops an abrupt jump -of up to an order of magnitude -at larger but finite N . We discuss the magnetic order-disorder transition from a quantum-field-theoretic perspective and comment on implications of our findings for the interpretation of experiments on quantum critical heavy-fermion compounds. arXiv:1910.07540v1 [cond-mat.str-el]

show abstract

Section: Introductionmentioning

confidence: 99%

Phase diagram and dynamics of the SU(N) symmetric Kondo lattice model

Raczkowski

Assaad

2020

Phys. Rev. Research

View full text Add to dashboard Cite

show abstract

“…The interplay between the different forces has an important impact on the overall nanoarchitecture structure. An exciting perspective of this work consists in exploring the catalytic3 and magnetic46 properties of these two‐dimensional nanoarchitectures based on salen complexes.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Dilullo et al. observed the appearance of an antiferromagnetic exchange coupling between the spin centers in a covalent salen chain 46. Future technological developments based on salen molecules require a precise control of their molecular electronic properties as well as their molecular assembly to optimize and tailor the properties of the 2D nanoarchitectures.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the Structure of Two‐Dimensional Self‐Assembled Nanoarchitectures Based on Ni^II–Salen Building Blocks

Viciano‐Chumillas

Latil

et al. 2014

Chemistry A European J

View full text Add to dashboard Cite

The synthesis of a series of Ni(II) -salen-based complexes with the general formula of [Ni(H2 L)] (H4 L=R(2) -N,N'-bis[R(1) -5-(4'-benzoic acid)salicylidene]; H4 L1: R(2) =2,3-diamino-2,3-dimethylbutane and R(1) =H; H4 L2: R(2) =1,2-diaminoethane and R(1) =tert-butyl and H4 L3: R(2) =1,2-diaminobenzene and R(1) =tert-butyl) is presented. Their electronic structure and self-assembly was studied. The organic ligands of the salen complexes are functionalized with peripheral carboxylic groups for driving molecular self-assembly through hydrogen bonding. In addition, other substituents, that is, tert-butyl and diamine bridges (2,3-diamino-2,3-dimethylbutane, 1,2-diaminobenzene or 1,2-diaminoethane), were used to tune the two-dimensional (2D) packing of these building blocks. Density functional theory (DFT) calculations reveal that the spatial distribution of the LUMOs is affected by these substituents, in contrast with the HOMOs, which remain unchanged. Scanning tunneling microscopy (STM) shows that the three complexes self-assemble into three different 2D nanoarchitectures at the solid-liquid interface on graphite. Two structures are porous and one is close-packed. These structures are stabilized by hydrogen bonds in one dimension, while the 2D interaction is governed by van der Waals forces and is tuned by the nature of the substituents, as confirmed by theoretical calculations. As expected, the total dipolar moment is minimized.

show abstract

“…[147] The variation of the Kondo resonance with the chain formation was investigated for Co-(5,5-Br2-Salophen) molecules. [131] The 1D molecular chain is formed by removing Br atoms of each molecule and forming covalent bonds between the molecules. A Fano dip of the Kondo resonance was detected over the Co ions.…”

Section: Molecular Ordering and Kondo Resonancementioning

confidence: 99%

“…The Kondo resonance for Co-(5,5-Br2-Salophen) changed with the molecules were assembled into covalent 1D chains. [131] It was found that T K increased with the number of molecules included in the chain, which affects the magnetic interactions among the spin centers. Similar spin-spin interactions have been observed by Tsukahara et al Moreover, the variation in the Kondo resonance for FePc molecules on Au(111) assembled into a two-dimensional lattice is correlated to Rudermann-Kittel-Kasuya-Yosida (RKKY) coupling between the molecular spins.…”

Section: Summary and Future Scopementioning

confidence: 99%

The Frontier of Molecular Spintronics Based on Multiple-Decker Phthalocyaninato Tb^IIISingle-Molecule Magnets

Katoh

Komeda

Yamashita

2016

The Chemical Record

View full text Add to dashboard Cite

Ever since the first example of a double-decker complex (SnPc2) was discovered in 1936, MPc2 complexes with π systems and chemical and physical stabilities have been used as components in molecular electronic devices. More recently, in 2003, TbPc2 complexes were shown to be single-molecule magnets (SMMs), and researchers have utilized their quantum tunneling of the magnetization (QTM) and magnetic relaxation behavior in spintronic devices. Herein, recent developments in Ln(III)-Pc-based multiple-decker SMMs on surfaces for molecular spintronic devices are presented. In this account, we discuss how dinuclear Tb(III)-Pc multiple-decker complexes can be used to elucidate the relationship between magnetic dipole interactions and SMM properties, because these complexes contain two TbPc2 units in one molecule and their intramolecular Tb(III)-Tb(III) distances can be controlled by changing the number of stacks. Next, we focus on the switching of the Kondo signal of Tb(III)-Pc-based multiple-decker SMMs that are adsorbed onto surfaces, their characterization using STM and STS, and the relationship between the molecular structure, the electronic structure, and the Kondo resonance of Tb(III)-Pc multiple-decker complexes.

show abstract

Molecular Kondo Chain

Cited by 110 publications

References 39 publications

Phase diagram and dynamics of the SU(N) symmetric Kondo lattice model

Phase diagram and dynamics of the SU(N) symmetric Kondo lattice model

Tailoring the Structure of Two‐Dimensional Self‐Assembled Nanoarchitectures Based on Ni^II–Salen Building Blocks

The Frontier of Molecular Spintronics Based on Multiple-Decker Phthalocyaninato Tb^IIISingle-Molecule Magnets

Contact Info

Product

Resources

About

Molecular Kondo Chain

Cited by 110 publications

References 39 publications

Phase diagram and dynamics of the SU(N) symmetric Kondo lattice model

Phase diagram and dynamics of the SU(N) symmetric Kondo lattice model

Tailoring the Structure of Two‐Dimensional Self‐Assembled Nanoarchitectures Based on NiII–Salen Building Blocks

The Frontier of Molecular Spintronics Based on Multiple-Decker Phthalocyaninato TbIIISingle-Molecule Magnets

Contact Info

Product

Resources

About

Tailoring the Structure of Two‐Dimensional Self‐Assembled Nanoarchitectures Based on Ni^II–Salen Building Blocks

The Frontier of Molecular Spintronics Based on Multiple-Decker Phthalocyaninato Tb^IIISingle-Molecule Magnets