Transverse voltage in high-Tc superconductors in zero magnetic fields

Vašek, P.

doi:10.1016/s0921-4534(01)00740-7

Cited by 10 publications

(19 citation statements)

References 6 publications

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“…In such a case, it is convenient to determine the resistivity of the sample by means of the van der Pauw technique. These kind of measurements were first carried out by Francavilla et al 22 and more recently by Vasek et al 23 These authors show that the transverse voltage for all samples coincides qualitatively with the standard six point method used in our work thus indicating that inhomogeneous current distributions are not the source of the observed ETV.…”

Section: Resultssupporting

confidence: 79%

“…12,18,[23][24][25][26][27][28][29] In this scenario, unlike the Glazman's theory where pinning is irrelevant, the pinning landscape plays a crucial role and the effect should be present even at high fields. All the experimental evidence reported so far ͑mainly on uniaxial pinning͒ shows that near the superconducting-normal transition a single ͑or multiple͒ anomalous peak in the transverse voltage develops.…”

Section: Resultsmentioning

confidence: 92%

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Guided vortex motion in superconductors with a square antidot array

et al. 2003

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We have measured the in-plane anisotropy of the vortex mobility in a thin Pb film with a square array of antidots. The Lorentz force, acting on the vortices, was rotated by adding two perpendicular currents and keeping the amplitude of the net current constant. One set of voltage probes was used to detect the vortex motion. We show that the pinning landscape provided by the square antidot lattice influences the vortex motion in two different ways. First, the modulus of the vortex velocity becomes angular dependent with a lower mobility along the diagonals of the pinning array. Second, the vortex displacement is preferentially parallel to the principal axes of the underlying pinning lattice, giving rise to a misalignment between the vortex velocity and the applied Lorentz force. We show that this anisotropic vortex motion is temperature dependent and progressively fades out when approaching the normal state.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 92%

Guided vortex motion in superconductors with a square antidot array

et al. 2003

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“…Existence of the non-zero transverse resistance in zero magnetic field has been recently observed in different HTS materials [5,6,7,8] [6,7]. While the van der Pauw method has been used in Ref.…”

Section: Resultsmentioning

confidence: 99%

“…Spontaneous creation of the free vortices and antivortices has been considered in Ref. [7]as a result of thermally activated dissociation of vortex-antivortex pairs at Kosterlitz-Thouless temperature T KT [12]. These free vortices and antivortices can move under the influence of external electric field and cause in this way dissipation which can in principle leads to the appearance of transverse voltage.…”

Section: Resultsmentioning

confidence: 99%

Transverse voltage in zero external magnetic fields, its scaling and violation of the time-reversal symmetry in MgB2

Vašek

Shimakage

Wang

2004

Physica C: Superconductivity and its Applications

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The longitudinal and transverse voltages (resistances) have been measured for MgB 2 in zero external magnetic fields. Samples were prepared in the form of thin film and patterned into the usual Hall bar shape. In close vicinity of the critical temperature T c non-zero transverse resistance has been observed. Its dependence on the transport current has been also studied. New scaling between transverse and longitudinal resistivities has been observed in the form ρ xy ∼ dρ xx /dT . Several models for explanation of the observed transverse resistances and breaking of reciprocity theorem are discussed. One of the most promising explanation is based on the idea of time-reversal symmetry violation.

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“…O procedimento foi baseado na retirada de uma porção das amostras que foi moída e pulverizada sobre uma placa amorfa e finalmente acoplada a um difratômetro com tubo de radiação CuK α e filtro de níquel. Os difratogramas de raios-x foram indexados de modo a se verificar a presença das fases de interesse e possíveis fases adicionais (DOS SANTOS, 2000, 2001Onoda et al, 1987 …”

Section: -Caracterização Das Amostrasunclassified

Efeito Hall em supercondutores a campo magnético nulo

Luz¹

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This work reports the influence of the granularity on the transverse resistance as a function of temperature, R XY (T), in Bi 2 Sr 2 Ca 1-x Pr x Cu 2 O 8+δ and YBa 2 Cu 3 O 7-δ polycrystalline samples, and Li 0.9 Mo 6 O 17 single crystals. The effects of warming rate, temperature, applied magnetic field, and electrical current on the Hall resistance are reported. At zero magnetic field two peaks are observed in R XY (T) curves for the three compounds. The peaks are related to the double superconducting transition in the longitudinal component R XX (T) curves. In the superconducting and normal states no transverse voltage has been detected at zero magnetic field, as expected. The results are discussed within the framework of the motion of Abrikosov and Josephson vortices and anti-vortices. A new scaling relation between transverse and longitudinal voltages given by R XY ~ dR XX /dT has been confirmed. Regarding Li 0.9 Mo 6 O 17 single crystals, Hall resistance at zero applied magnetic field was also observed. Furthermore, the results confirm the quasi-unidimensionality but show smaller anisotropic ratio than previously reported. Simultaneously, the result reveals that the Li 0.9 Mo 6 O 17 is the first bulk superconducting compound exhibiting superconductor-insulator-transition (SIT) and metalinsulator-transition (MIT) behaviors.

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Transverse voltage in high-Tc superconductors in zero magnetic fields

Cited by 10 publications

References 6 publications

Guided vortex motion in superconductors with a square antidot array

Guided vortex motion in superconductors with a square antidot array

Transverse voltage in zero external magnetic fields, its scaling and violation of the time-reversal symmetry in MgB2

Efeito Hall em supercondutores a campo magnético nulo

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