Superconductivity in doped nondegenerate insulators

Agafonov, A. I.; Manykin, E. A.

doi:10.1134/1.1609000

Cited by 4 publications

(2 citation statements)

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“…hydrogen, alkali or alkali-earth atoms) into this host precursor structure. Light electronegative elements promote an enhancement of the ionicity bond degree [18] and contribute to the softening of the phonon modes, which is important for the appearance of HTSC. The scepticism of the scientific community with regard to the search for new SC materials amid non-Cu-based (particularly V-based) compounds 1 is founded, among other arguments, upon the opinion that 'binary structures with only two sites per unit cell lack the possibility of being able to substitute and introduce charge carriers without introducing disorder directly into the conduction band, and thus are considered to be less likely candidates for supporting SC than more complex structures' [15].…”

mentioning

confidence: 99%

Influence of doping on the properties of vanadium oxide gel films

Pergament¹,

Velichko²,

Berezina³

et al. 2008

J. Phys.: Condens. Matter

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Metal-insulator transitions and other electronic transitions) 72.80.Ga (Transition-metal compounds)Abstract. Effect of doping with H and W on the properties of V2O5 and VO2 derived from V2O5 gel has been studied. It is shown that the treatment of V2O5 in low-temperature RF hydrogen plasma for 1 to 10 min. leads to either hydration of vanadium pentoxide or its reduction (depending on the treatment conditions) to lower vanadium oxides. For some samples, which are subject to plasma treatment in the discharge active zone, a non-ordinary temperature dependence of resistance, with a maximum at T ~ 100 K, is observed. For W-doped VO2 films, it is shown that substitution of V 4+ with W 6+ results in a decrease of the temperature of metal-insulator transition.Also, it has been shown that the doping of the initial films with ~3 at.% of W reduces the statistical scatter in the threshold parameters of the switching devices with S-shaped I-V characteristics on the basis of V2O5 gel films.

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mentioning

confidence: 99%

Influence of doping on the properties of vanadium oxide gel films

Pergament¹,

Velichko²,

Berezina³

et al. 2008

J. Phys.: Condens. Matter

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“…. Also, doping-induced disorder can lead to the absence of this symmetry in the doped cuprates [7]. As a result, the mixed singlet-triplet state in the cuprates may be, in principle, possible [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Manifestation of the magnetic moments of Cooper pairs in low-temperature properties of superconducting thin-film rings

Agafonov

2013

Physica C: Superconductivity

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Experimental determination of the magnetic moment of the Cooper pairs can shed light on the pairing symmetry in cuprates. We argue that the intrinsic magnetic moments of the Cooper pairs can be detected in experiments with superconducting thin-film rings. At sufficiently low temperatures the magnetic field generated by the supercurrent, can cause the ordering of these magnetic moments that produces changes in the supercurrent and magnetic induction distributions, the heat capacity and magnetic moment of the ring. It is shown that the intrinsic magnetic moment of the Cooper pairs can be extracted from low-temperature behaviours of these measurable quantities of the current-carrying rings made of the cuprate superconductors.

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