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Marchenko, A. P.; Koidan, G. N.; Shevchenko, V.A.; Kozlov, E. S.; Gordeev, A. D.; Soǐfer, G. B.

doi:10.1023/a:1015330320307

Cited by 4 publications

(2 citation statements)

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“…The vast majority of the theoretical approaches for describing the physical mechanisms of these ratchet systems assume an infinite medium with no borders or with periodic boundary conditions. Neglecting sample borders in superconducting systems seems to be unjustified from an experimental point of view [10,11] unless special care is taken to move the particles in circles such as in the Corbino disc configuration [12]. Indeed, it has been recognized in the past that unwanted differences between the two sample borders can lead to spurious rectification signals [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Vortex ratchet induced by controlled edge roughness

et al. 2013

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We demonstrate theoretically and experimentally the generation of rectified mean vortex displacement resulting from a controlled difference between the surface barriers at the opposite borders of a superconducting strip. Our investigation focuses on Al superconducting strips where, in one of the two sample borders, a saw tooth-like array of micro-indentations has been imprinted. The origin of the vortex ratchet effect is based on the fact that (i) the onset of vortex motion is mainly governed by the entrance/nucleation of vortices and (ii) the current lines bunching produced by the indentations facilitates the entrance/nucleation of vortices. Only for one current direction the indentations are positioned at the side of vortex entry and the onset of the resistive regime is lowered compared to the opposite current direction. This investigation points to the relevance of ubiquitous border effects typically neglected when interpreting vortex ratchet measurements on samples with arrays of local asymmetric pinning sites. 5

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Section: Introductionmentioning

confidence: 99%

Vortex ratchet induced by controlled edge roughness

et al. 2013

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“…Our estimates for the structural stability of ylides II3VI and the synthetic data for perchloro1l 5 ,3l 5 -diphosphetane [15] that spontaneously decomposes on handling make us to expect that trichlorophosphonium ylides II and III can be isolated pure. In view of the instability of the dimer (Cl 3 P .…”

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confidence: 86%

Specific Interactions and the Nature of the Chemical Nonequivalence of Chlorine Atoms in the ECl3 Group (E = C, P) of Trichlorophosphonium Ylides and Isomeric Dichloro(trichloromethyl)phosphine

Romanenko

2005

Russ J Gen Chem

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The nature of the asymmetry of the ECl 3 group (E = C, P) in dichloro(trichloromethyl)phosphine and trichlorophosphonium methylide and dichloromethylide was studied by nonempirical and MNDO3PM3 calculations and 35 Cl NQR spectroscopy. The chemical nonequivalence of chlorine atoms in the CCl 3 group of dichloro(trichloromethyl)phosphine is caused by steric interaction with the PCl 2 fragment. In the PCl 3 group of trichlorophosphonium methylide and dichloromethylide, this nonequivalence arises from specific interactions with the lone electron pair of the ylide carbon atom, whose p-character is about 94% on the RHF/6-311 ++ G(3df,3pd) level. The alteration of the type of interaction predicts inversion of the 35 Cl NQR signals of the PCl 3 group in trichlorophosphonium ylide and dichloromethylide in relation to those of the CCl 3 group in the experimental spectrum of dichloro(trichloromethyl)phosphine. The MNDO3PM3 method characterizes dichloro-and diphenylmethylides as unstabilized structurally stable ylides.Recently [1] we considered the conformational structure of dichloro(chloromethyl)phosphines, that proved to be quite sensitive to the degree of chlorination of the methyl group. The transition from the monochloromethyl to trichloromethyl derivative is accompanied by the transformation of the gauche to staggered conformation, noticeable distortion of the C 3v local symmetry of the CCl 3 group, and increase in the activation energy of hindered rotation of this group about the phosphorus3carbom bond [2].Trichlorophosphonium ylides isomeric to dichloro-(chloromethyl)phosphines, unlike related phosphorus oxides and imines, have not yet been isolated pure, even though some of their representatives exhibit thermodynamic and kinetic stability [1, 2]. Trichlorophosponium ylides present interest in terms of the investigation of peculiar details of interaction of their phosphonium and carbanionic fragments by following alterations in the local symmetry of the trichlorophosphonium group PCl 3 (analogous to those of the CCl 3 group of trichloromethylphosphines) as a specific probe.In the present work we made use of quantum-chemical calculations and 35 Cl NQR spectroscopy to compare the effect of specific and steric interactions on the structure of the ECl 3 group (E = C,P) and chemical nonequivalence and lability of chlorine atoms of this group in dichloro(trichloromethyl)phosphine (I), trichlorophosphonium methylide (II), and isomeric trichlorophosphonium dichloromethylide (III), and to discuss the specific structural features of dichloromethylides R 2 ClPCl 2 [R = Cl (III), t-Bu (IV), and NEt 2 (V] and diphenylmethylylide t-BuClPCPh 2 (VI). Nonempirical calculations of compounds I3III were carried out at the Hartree3Fock level using the 6-31 ++ G(d,p) basis set [3]. With ylide II, these calculations were compared with calculations including electron correlation (MP2) [3] and those with the 6-311 ++ G(3df, 3pd) (5D, 7F basis) extended triple split valence set [4] including diffusive and polarization functions on light and ...

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NQRS Data for C2Cl10P2 (Subst. No. 0515)

Chihara¹,

Nakamura²

2010

Landolt-Börnstein - Group III Condensed Matter

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Cited by 4 publications

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Vortex ratchet induced by controlled edge roughness

Vortex ratchet induced by controlled edge roughness

Specific Interactions and the Nature of the Chemical Nonequivalence of Chlorine Atoms in the ECl3 Group (E = C, P) of Trichlorophosphonium Ylides and Isomeric Dichloro(trichloromethyl)phosphine

NQRS Data for C2Cl10P2 (Subst. No. 0515)

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