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Green, D.; Brooks, J. S.; Kuhns, P. L.; Reyes, A. P.; Lumata, Lloyd; Almeida, Manuel; Matos, M.; Henriques, R.T.; Wright, Jeffrey A.; Brown, Stuart

doi:10.1103/physrevb.84.121101

Cited by 10 publications

(13 citation statements)

References 15 publications

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“…Note that in agreement with the finding of a structural "TSP" the abrupt drop of the EPR signal below 7.5K indicates a concomitant loss of spin degrees of freedom [36]. The finding of a TSP distinct from TP seems to be sustained by extrapolation to 0K of the magnetic phase diagram [37]. The establishment of a low temperature spin-singlet ground state on [Pt(mnt)2] chains is evident from 1 H NMR spectra and spin relaxation (1/T1) rates [38,39].…”

Section: B-spin-peierls and Peierls Orderssupporting

confidence: 68%

Peierls and Spin-Peierls Instabilities in the Per2[M(mnt)2] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

Pouget¹,

Foury-Leylekian²,

Almeida³

2017

Preprint

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We summarize structural instabilities exhibited by the one dimensional (1D) (arene)2X family of organic conductors in relation with their electronic and magnetic properties. With a charge transfer of one electron to each anion X these salts exhibit a quarter-filled (hole) conduction band located on the donor stacks. Compounds built with donors such as fluorenthene and perylene derivatives and anions X such PF6 or AsF6 exhibit a high temperature (TP~170K) conventional Peierls transition which is announced by a sizeable regime of 1D 2kF charge density wave fluctuations (kF is the Fermi wave vector of the 1D electron gas located on Per stacks). Surprisingly, and probably because of the presence of a multi-sheet warped Fermi surface, the Peierls transition is considerably reduced in the perylene series α-(Per)2[M(mnt)2] where X is the dithiolate molecule with M=Au, Cu, Co and Fe. A special attention is devoted in this paper to physical properties of α-(Per)2[M(mnt)2] salts which with M=Pt, Pd and Ni incorporate segregated S=1/2 1D antiferromagnetic (AF) dithiolate stacks with 1D metallic Per stacks. We analyse conjointly the structural and magnetic properties of these salts in relation with the 1D spin-Peierls (SP) instability located on the dithiolate stacks. We show that the SP instability of the Pd and Ni derivatives occurs in the classical (adiabatic limit) while the SP instability of the Pt derivative occurs in the quantum (anti-adiabatic limit). Furthermore we show that in the Pd and Ni derivatives frustrated 1 st neighbour direct and 2 nd neighbour indirect (through a fine tuning with the mediated 2kF RKKY coupling interaction on Per stacks) AF interactions add their contribution to the SP instability to open a singlet-triplet gap. Our analysis of the data show unambiguously that magnetic α-(Per)2[M(mnt)2] salts are a typical realization of the physics predicted for two chain 1D Kondo lattices.

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Section: B-spin-peierls and Peierls Orderssupporting

confidence: 68%

Peierls and Spin-Peierls Instabilities in the Per2[M(mnt)2] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

Pouget¹,

Foury-Leylekian²,

Almeida³

2017

Preprint

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“…site is that these two transitions appear to be nearly, or even exactly coincident at a temperature T giving rise to the still open question of how the order parameters cou the other [2,3]. 2 ] showing the (paramagnetic-metallic), and HF splitting of NMR spectra (open symbols) and metal transport measurements (solid symbols) for a field applied along the a References [4,5] for detailed discussion)…”

Section: Introductionmentioning

confidence: 99%

1H and 195Pt NMR Study of the Parallel Two-Chain Compound Per2[Pt(mnt)2]

et al. 2012

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Abstract:1 H and 195 Pt NMR are used to probe the spin ½ anion chain in the quasi-one-dimensional conductor Per 2 [Pt(mnt) 2 ], which exhibits nearly simultaneous charge density wave (CDW) and spin-Peierls (SP) transitions at low temperatures (T c ~ 8 K). Below T c the [Pt(mnt) 2 ] chain forms a spin-singlet state that is evident in 1 H NMR spectra and spin relaxation (1/T 1 ) rates; however minority unpaired Pt spins may remain in the SP ground state. With increasing magnetic field, the SP and CDW order parameters decrease in unison, indicating they are coupled up to a critical field B c ~ 20 T. Above B c , the spin singlet evolves into a spin-polarized configuration. The 195 Pt NMR signals vanish as either T c or B c are approached from within the SP ground state, suggesting the hyperfine field of the Pt nucleus is significantly stronger than at the proton sites. Simulations yield a consistent picture of the angular, temperature, and magnetic field-dependent spectral features. OPEN ACCESS OPEN ACCESSCrystals 2012, 2

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“…However, Table 2 indicates a T P (8.2 K corresponding to the metal-insulator transition detected from transport measurements) distinct from "T SP" (7.5 K temperature at which 1D SP fluctuations tend to diverge and at which the EPR signal drop [38]). The finding of a T SP distinct from T P seems to be sustained by the extrapolation to 0 T of the magnetic phase diagram of the Pt salt [39].…”

Section: Spin-peierls and Peierls Ordersmentioning

confidence: 81%

“…The establishment of a low temperature spin-singlet ground state on [Pt(mnt) 2 ] chains is evident from EPR [38], 1 H NMR spectra and spin relaxation (1/T 1 ) rate [39,40] measurements. However, local magnetic measurements cannot probe the spatial extend of the SP order.…”

Section: Spin-peierls and Peierls Ordersmentioning

confidence: 99%

Peierls and Spin-Peierls Instabilities in the Per2[M(mnt)2] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

2017

View full text Add to dashboard Cite

Abstract:We consider structural instabilities exhibited by the one-dimensional (1D) (arene) 2 X family of organic conductors in relation with their electronic and magnetic properties. With a charge transfer of one electron to each anion X, these salts exhibit a quarter-filled (hole) conduction band located on donor stacks. Compounds built with donors such as fluorenthene, perylene derivatives and anions X such as PF 6 or AsF 6 exhibit a high temperature (T P~1 70 K) conventional Peierls transition that is preceded by a sizeable regime of 1D 2k F charge density wave fluctuations (k F is the Fermi wave vector of the 1D electron gas located on Per stack). Surprisingly, and probably because of the presence of a multi-sheet warped Fermi surface, the critical temperature of the Peierls transition is considerably reduced in the perylene series α-(Per) 2 [M(mnt) 2 ] where X is the dithiolate molecule with M = Au, Cu, Co and Fe. Special attention will be devoted to physical properties of α-(Per) 2 [M(mnt) 2 ] salts with M = Pt, Pd and Ni which incorporate segregated S = 1/2 1D antiferromagnetic (AF) dithiolate stacks coexisting with 1D metallic Per stacks. We analyze conjointly the structural and magnetic properties of these salts in relation with the 1D spin-Peierls (SP) instability located on the dithiolate stacks. We show that the SP instability of Pd and Ni derivatives occurs in the classical (adiabatic) limit while the SP instability of the Pt derivative occurs in the quantum (anti-adiabatic) limit. Furthermore, we show that in Pd and Ni derivatives 1st neighbor direct and frustrated 2nd neighbor indirect (through a fine tuning with the mediated 2k F RKKY coupling interaction on Per stacks) AF interactions add their contribution to the SP instability to stabilize a singlet-triplet gap. Our analysis of the data show unambiguously that magnetic α-(Per) 2 [M(mnt) 2 ] salts exhibit the physics expected for a two chain Kondo lattice.

show abstract

Interaction of magnetic field-dependent Peierls and spin-Peierls ground states in(Per)2[Pt(mnt)

Cited by 10 publications

References 15 publications

Peierls and Spin-Peierls Instabilities in the Per<sub>2</sub>[M(mnt)<sub>2</sub>] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

Peierls and Spin-Peierls Instabilities in the Per<sub>2</sub>[M(mnt)<sub>2</sub>] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

1H and 195Pt NMR Study of the Parallel Two-Chain Compound Per2[Pt(mnt)2]

Peierls and Spin-Peierls Instabilities in the Per2[M(mnt)2] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

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