Seebeck-effect in the mixed state of Y?Ba?Cu?O

Hohn, C.; Galffy, M.; Dascoulidou, A.; Freimuth, A.; Soltner, H.; Poppe, U.

doi:10.1007/bf01313216

Cited by 31 publications

(13 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is usually obtained from measurements of the Nernst effect (or the Ettingshausen effect) and the flux-flow resistivity [3,25,35,[52][53][54][55]. Φ 0 is the flux quantum and S is the thermopower (or Seebeck-coefficient) [25,35,[53][54][55]. For an estimate we use the data on YBCO of references [54,55]: s v ≈ 5 × 10 −15 J/Km close to T c ≈ 90 K and S(T c ) ≈ 2.5 µV/K.…”

Section: 1 Contributions To the Heat Currentmentioning

confidence: 99%

See 1 more Smart Citation

Thermal conductivity and thermal Hall effect in Bi- and Y-based high-T c superconductors

et al. 2001

Self Cite

View full text Add to dashboard Cite

Measurements of the thermal conductivity (kxx) and the thermal Hall effect (kxy) in high magnetic fields in Y-and Bi-based high-Tc superconductors are presented. We describe the experimental technique and test measurements on a simple metal (niobium). In the high-Tc superconductors kxx and kxy increase below Tc and show a maximum in their temperature dependence. kxx has contributions from phonons and quasiparticle (QP) excitations, whereas kxy is purely electronic. The strong increase of kxy below Tc gives direct evidence for a strong enhancement of the QP contribution to the heat current and thus for a strong increase of the QP mean free path. Using kxy and the magnetic field dependence of kxx we separate the electronic thermal conductivity (k el xx ) of the CuO2-planes from the phononic thermal conductivity (k ph xx ). In YBa2Cu3O 7−δ k el xx shows a pronounced maximum in the superconducting state. This maximum is much weaker in Bi2Sr2CaCu2O 8+δ , due to stronger impurity scattering. The maximum of k el xx is strongly suppressed by a magnetic field, which we attribute to the scattering of QPs on vortices. An additional magnetic field independent contribution to the maximum of kxx occurs in YBa2Cu3O 7−δ , reminiscent of the contribution of the CuO-chains, as determined from the anisotropy in untwined single crystals. Our data analysis reveals that below Tc as in the normal state a transport (τ ) and a Hall (τH) relaxation time must be distinguished: The inelastic (i.e. temperature dependent) contribution to τ is strongly enhanced in the superconducting state, whereas τH displays the same temperature dependence as above Tc. We determine also the electronic thermal conductivity in the normal state from kxy and the electrical Hall angle. It shows an unusual linear increase with temperature.

show abstract

Section: 1 Contributions To the Heat Currentmentioning

confidence: 99%

“…Φ 0 is the flux quantum and S is the thermopower (or Seebeck-coefficient) [25,35,[53][54][55]. For an estimate we use the data on YBCO of references [54,55]: s v ≈ 5 × 10 −15 J/Km close to T c ≈ 90 K and S(T c ) ≈ 2.5 µV/K. This yields k v xy (T c ) ≈ −5 × 10 −4 W/Km.…”

Section: 1 Contributions To the Heat Currentmentioning

confidence: 99%

Thermal conductivity and thermal Hall effect in Bi- and Y-based high-T c superconductors

et al. 2001

Self Cite

View full text Add to dashboard Cite

show abstract

“…We cannot list the various routes for producing HTS superconductors nor mention all papers pertaining to studies of magnetotransport in HTS The basic references which we can mention below without excessively increasing the list will therefore only be at the intersection of reports concerned with magnetotransport, films and Bi-based systems. We thus quote [20][21][22][23][24][25][26]. As a pioneering and quite thorough investigation that of Dascoulidou and co-workers [23] is probably the most relevant.…”

Section: Introductionmentioning

confidence: 99%

Impact of Negative-Bias Temperature Instability on the Lifetime of Single-Gate CMOS Structures with Ultrathin (4–6 nm) Gate Oxides

Ogawa

Shimaya

Shiono

1996

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

Various physical properties of a high-pressure made Bi 1.84 Pb 0.34 Sr 1.91 Ca 2.03 Cu 3.06 O x ceramic have been studied in the normal state and mixed state region, mainly from the point of view of transport properties. The electrical resistivity, the thermoelectric power and the Nernst effect are reported for a broad temperature range and for fields between 0 and 4 T. Derived physical parameters like the excess (integrated) properties, the behaviour of the percolation line(s) as a function of temperature and field, the so-called transport energy, and the so-called activation energies, the Ginzburg-Landau parameter and the thermal Hall angle field and temperature dependence are given and briefly compared with previous reports. We point out that in the region examined, the so-called percolation lines differ whether the transport coefficient is purely electrical or is electrothermal in nature. We point out that the 90 • thermal Hall angle temperature is the same as the thermoelectric percolation temperature. Finally we examine for the first time in such systems the behaviour of the so-called 'electrothermal conductivity'. Through a kinetic formalism using either an s-wave or a d-wave-like order parameter, we point out that the field dependence is quite different in the mixed state near the critical temperature. This allowed us to decide that the signature for a d-wave nature of the gap parameter exists for such transport properties near the critical temperature.

show abstract

“…The Seebeck coefficients are related to the components and crystal orientation. In the case of YBCO in the superconducting state (90 K), the Seebeck coefficients of the c-axis and ab-plane are S c : 2.3 V/K and S ab : 2.5 V/K, respectively [6]. As a quality control method, the RTI method evaluates the surface grain structures.…”

Section: Methodsmentioning

confidence: 99%

Local transport properties of coated conductors by laser-scan imaging methods

Kim¹,

Jo²,

Nam³

et al. 2016

Progress in Superconductivity and Cryogenics

View full text Add to dashboard Cite

To observe the superconducting current and structural properties of high critical temperature (T c ) superconductors (HTS), we suggest the following imaging methods: Room temperature imaging (RTI) through thermal heating, low-temperature bolometric microscopy (LTBM) and Raman scattering imaging. RTI and LTBM images visualize thermal-electric voltages as different thermal gradients at room temperature (RT) and superconducting current dissipation at near-T c , respectively. Using RTI, we can obtain structural information about the surface uniformity and positions of impurities. LTBM images show the flux flow in two dimensions as a function of the local critical currents. Raman imaging is transformed from Raman survey spectra in particular areas, and the Raman vibration modes can be combined. Raman imaging can quantify the vibration modes of the areas. Therefore, we demonstrate the spatial transport properties of superconducting materials by combining the results. In addition, this enables visualization of the effect of current flow on the distribution of impurities in a uniform superconducting crystalline material. These imaging methods facilitate direct examination of the local properties of superconducting materials and wires.

show abstract

Seebeck-effect in the mixed state of Y?Ba?Cu?O

Cited by 31 publications

References 20 publications

Thermal conductivity and thermal Hall effect in Bi- and Y-based high-T c superconductors

Thermal conductivity and thermal Hall effect in Bi- and Y-based high-T c superconductors

Impact of Negative-Bias Temperature Instability on the Lifetime of Single-Gate CMOS Structures with Ultrathin (4–6 nm) Gate Oxides

Local transport properties of coated conductors by laser-scan imaging methods

Contact Info

Product

Resources

About