Superconductivity of Metals and Alloys

Gennes, P. G. de

doi:10.1201/9780429497032

Cited by 1,478 publications

(969 citation statements)

References 19 publications

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“…In general, the critical magnetic field in mesoscopic superconductors becomes larger than that in bulk superconductors. We estimated and using H c 3 = 1.7 H c 2 42. This may be comparable to the result for the B − V characteristics in our nanofilms because we observed the gap structure in a high field of 4 T as shown in Fig.…”

Section: Discussionsupporting

confidence: 86%

Chern structure in the Bose-insulating phase of Sr2RuO4 nanofilms

Nobukane

Matsuyama

Tanda

2017

Sci Rep

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The quantum anomaly that breaks the symmetry, for example the parity and the chirality, in the quantization leads to a physical quantity with a topological Chern invariant. We report the observation of a Chern structure in the Bose-insulating phase of Sr2RuO4 nanofilms by employing electric transport. We observed the superconductor-to-insulator transition by reducing the thickness of Sr2RuO4 single crystals. The appearance of a gap structure in the insulating phase implies local superconductivity. Fractional quantized conductance was observed without an external magnetic field. We found an anomalous induced voltage with temperature and thickness dependence, and the induced voltage exhibited switching behavior when we applied a magnetic field. We suggest that there was fractional magnetic-field-induced electric polarization in the interlayer. These anomalous results are related to topological invariance. The fractional axion angle Θ = π/6 was determined by observing the topological magneto-electric effect in the Bose-insulating phase of Sr2RuO4 nanofilms.

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Section: Discussionsupporting

confidence: 86%

Chern structure in the Bose-insulating phase of Sr2RuO4 nanofilms

Nobukane

Matsuyama

Tanda

2017

Sci Rep

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“…With the growth of T c (P), the value n c (P) decreases, and vice versa, which could indicate that the ratio between these values may be governed by the general theory of superconductivity [65][66][67][68], from which it follows that n 0 * hv F /k B T c .…”

Section: Experimental Methodsmentioning

confidence: 95%

Modification by high pressure of fluctuation paraconductivity of underdoped HoBa2Cu3O7-δ single crystals

Kamchatnaya

Goulatis

Вовк

et al. 2016

J Mater Sci: Mater Electron

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In this work, we investigate the effect of high pressure on the conductivity in the basal plane of the high temperature super conducting (HTSC) single crystals HoBa 2 Cu 3 O 7-d . It is determined that the excess conductivity Dr(T) of the HoBa 2 Cu 3 O 7-d single crystals in the temperature interval near the critical temperature (T c ) is described within the framework of the Aslamazov-Larkin theoretical model. It is shown that the evolution of the transverse coherence length n c (0) in the case of application/ removal of high pressure is largely determined by the ''relaxation'' pressure effect during prolonged exposure of the sample under load at room temperature.

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“…ρ is determined by (11), and ϒ by (48). ρϒ is determined by interaction between the two order parameters ρ( r ) and ϒ( r ) and its value is of the order of (48).…”

Section: M( R ) = M(n( R )) N( Rmentioning

confidence: 99%

“…The analysis of the surface tension due to the order parameter χ is standard [11]. The characteristic distance of its variation is ξ(T ):…”

Section: The Surface Tension At the MI Interfacementioning

confidence: 99%

Quantum Magnetic Oscillations of the Surface Tension at a Metal-Insulator Interface

Dubovskii

2016

J Low Temp Phys

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Any metal-insulator transition (MI transition) in a crystalline material must be a transition from a situation in which electronic bands overlap to a situation when they do not (Mott, Metal-insulator, 2nd edn. Taylor@Francis, London, 1990). For this case the self-consistent equations for the two-band conductor are formulated (cf. Dubovskii, JETP Lett. 99(1): [22][23][24][25][26] 2014). The description of the MI phase transition is based on two order parameters. The first one is the material density distribution at the MI boundary ρ( r ). The second one is a four-component complex vector in spin space ϒ( r ). The value ϒ( r ) determines the electron density in the metallic or semimetallic phase in the presence of an external magnetic field. Two different components of the vector describe possible spin states of electrons and holes inserted in the external magnetic field. The solution gives a singular behavior of the surface tension at the MI interface in the vicinity of the MI phase transition. At low temperature quantum oscillations of the surface tension in the magnetic field take place.

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Superconductivity of Metals and Alloys

Cited by 1,478 publications

References 19 publications

Chern structure in the Bose-insulating phase of Sr2RuO4 nanofilms

Chern structure in the Bose-insulating phase of Sr2RuO4 nanofilms

Modification by high pressure of fluctuation paraconductivity of underdoped HoBa2Cu3O7-δ single crystals

Quantum Magnetic Oscillations of the Surface Tension at a Metal-Insulator Interface

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