Impurities in spin-Peierls systems including lattice relaxation

Hansen, Patricia María; Augier, D.; Riera, J.; Poilblanc, Didier

doi:10.1103/physrevb.59.13557

Cited by 28 publications

(60 citation statements)

References 27 publications

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“…At the other extreme range of concentrations, for large x, the incorporation of diamagnetic centers in the [Pt(mnt) 2 ] − chains soon destroyed the spin-Peierls transition as theoretically predicted [27]. For x = 0.98, two types of samples were obtained, as previously denoted by transport measurements, one of α-and another of β-polymorph.…”

Section: Magnetic Susceptibilitysupporting

confidence: 56%

The Solid Solutions (Per)2[PtxAu(1−x)(mnt)2]; Alloying Para- and Diamagnetic Anions in Two-Chain Compounds

et al. 2017

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Abstract:The α-(Per) 2 [M(mnt) 2 ] compounds with M = Pt and Au are isostructural two-chain solids that in addition to partially oxidized conducting perylene chains also contain anionic chains that can be either paramagnetic in the case of M = Pt or diamagnetic for M = Au. The electrical transport and magnetic properties of the solid solutions (Per) 2 [Pt x -Au (1−x) (mnt) 2 ] were investigated. The incorporation of paramagnetic [Pt(mnt) 2 ] impurities in the diamagnetic chains, and the effect of breaking the paramagnetic chains with diamagnetic centers for the low and high Pt range of concentrations were respectively probed. In the low Pt concentration range, there is a fast decrease of the metal-to-insulator transition from 12.4 K in the pure Au compound to 9.7 K for x = 0.1 comparable to the 8.1 K in the pure Pt compound. In the range x = 0.50−0.95, only β-phase crystals could be obtained. The spin-Peierls transition of the pure Pt compound, simultaneous with metal-to-insulator (Peierls) transition is still present for 2% of diamagnetic impurities (x = 0.98) with transition temperature barely affected. Single crystal X-ray diffraction data obtained a high-quality structural refinement of the α-phase of the Au and Pt compounds. The β-phase structure was found to be composed of ordered layers with segregated donors and anion stacks, which alternate with disordered layers. The semiconducting properties of the β-phase are due to the disorder localization effects.

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Section: Magnetic Susceptibilitysupporting

confidence: 56%

The Solid Solutions (Per)2[PtxAu(1−x)(mnt)2]; Alloying Para- and Diamagnetic Anions in Two-Chain Compounds

et al. 2017

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“…with and without nonmagnetic impurities the weak and strong bonds of the dimerized chain may remain the same as for non-dynamical phonons [45] and this behavior has been verified numerically. [38] That is, even site chains with both weak links are still present in SP chains due to elastic coupling to pure neighbor chains.…”

Section: Magnetic Susceptibility At Finite Temperaturesmentioning

confidence: 99%

Effect of spin-1 impurities in dimerized Heisenberg chains

et al. 1998

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The effects of spin-1 impurities introduced in dimerized antiferromagnetic spin chains are studied using Lanczos diagonalization and quantum Monte Carlo simulations. Firstly, the magnitude of the interaction between a Ni-ion replacing a Cu-ion is derived for the case study system Cu-O-Cu. Then, it is shown that the introduction of S = 1 impurities leads to the suppression of the original spin gap of the dimerized system and to the enhancement of the antiferromagnetic correlations close to the impurity. These features are interpreted in terms of a valence bond picture of the ground state of both the pure and the doped system. The similitudes and differences between the underlying mechanisms that produce these effects in the cases of nonmagnetic and S = 1 impurities are analyzed. It is stressed that a singlet formed between the spin-1 impurity site and the two spin-1/2 neighbors spins behaves as an effective nonmagnetic vacancy which may be partially responsible for the enhancement of the antiferromagnetic correlations on the whole system. Implications of these results for experiment are also discussed.

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“…The physical picture is completely different when a static bond dimerisation exists and produces an attractive potential between the soliton and the dopant [4,5] and consequently leads, under doping, to the formation of local magnetic moments [4,7] as well as a rapid suppression of the spin gap [6]. However, a coupling to a purely one-dimensional (1D) adiabatic lattice [8] does not produce confinement in contrast to more realistic models including an elastic inter-chain coupling (to mimic 2D or 3D lattices) [8,9]. Doping quasi-1D dimerised spin chains is realized experimentally by substituting a small fraction of Copper atoms by Zinc (or Magnesium) atoms in CuGeO 3 [10].…”

mentioning

confidence: 99%

Doped Coupled Frustrated Spin-12Chains with Four-Spin Exchange

Laflorencie

Poilblanc

2003

Phys. Rev. Lett.

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The role of various magnetic inter-chain couplings is investigated by numerical methods in doped frustrated quantum spin chains. A non-magnetic dopant introduced in a gapped spin chain releases a free spin-1 2 soliton. The formation of a local magnetic moment is analyzed in term of soliton confinement. A four-spin coupling which might originate from cyclic exchange is shown to produce such a confinement. Dopants on different chains experience an effective space-extended non-frustrating pairwise spin interaction.

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Impurities in spin-Peierls systems including lattice relaxation

Cited by 28 publications

References 27 publications

The Solid Solutions (Per)2[PtxAu(1−x)(mnt)2]; Alloying Para- and Diamagnetic Anions in Two-Chain Compounds

The Solid Solutions (Per)2[PtxAu(1−x)(mnt)2]; Alloying Para- and Diamagnetic Anions in Two-Chain Compounds

Effect of spin-1 impurities in dimerized Heisenberg chains

Doped Coupled Frustrated Spin-12Chains with Four-Spin Exchange

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