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Sunday, May 17, 2020 | History

2 edition of Spin injection into high temperature superconductor found in the catalog.

Spin injection into high temperature superconductor

C. H. L. Severac

Spin injection into high temperature superconductor

by C. H. L. Severac

  • 320 Want to read
  • 37 Currently reading

Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D) - University of Birmingham, School of Physics and Astronomy, Faculty of Science, 2000.

Statementby Childérick Henri Louis Severac.
The Physical Object
Pagination165 p. :
Number of Pages165
ID Numbers
Open LibraryOL21555837M

  In the energy range of the spin splitting of the density of states, the current flowing into the superconductor is nearly fully spin polarized, independent of the spin polarization of the tunnel conductance. Consequently, high-field tunneling also provides very efficient spin injection into superconductors [67, 99].Cited by:   “High temperature” is still very cold: the highest temperature for superconductivity achieved was °C for hydrogen sulphide at extremely high pressures. For normal pressures, °C is near the upper limit. Unfortunately, high-temperature superconductors—which require relatively cheap liquid nitrogen, rather than liquid helium, to.

High-Temperature Superconductors provides an up-to-date and comprehensive review of the properties of these fascinating materials. Much has been learned about the behavior and mechanism of this novel type of superconductivity over the past five years, but many questions remain unanswered. High-Temperature Superconductivity: History and Outlook Fig. 1 Low-temperature Resistivity of a Ba-doped LaCuO 3 Sample with x (Ba)=, Recorded for Different Current Densities Fig. 2 Temperature Dependence of the Magnetic Susceptibility in Ba-doped La 2CuO 4 A/cm2 0 A/cm2 A/cm2 0 T(K) ρ.

conducting energy gap[1{5]. Here we perform tunnel spectroscopy of a mesoscopic superconductor under high electric eld. We observe quasiparticle injection into titanium with times the gap energy, an unexplored regime of quasiparticle dynamics. We expect that high-energy injection will.   In the s, the discovery of high-temperature superconductors known as cuprates upended a widely held theory that superconductor materials .


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Spin injection into high temperature superconductor by C. H. L. Severac Download PDF EPUB FB2

Recent comparative studies of quasiparticle injection from colossal magnetoresistance (CMR) materials and normal metals into high transition temperature superconductors (HTS) have led several investigators to conclude that spin-polarized injection from CMR electrodes is far more efficient than ordinary injection in suppressing superconductivity.

On the other hand, some ordinary Cited by: Request PDF | Current injection into high temperature superconductors: Does spin matter. | Recent comparative studies of quasiparticle injection from colossal magnetoresistance (CMR) materials and.

Spin Injection into a Superconductor with Strong Spin-Orbit Coupling Article (PDF Available) in Physical Review Letters (3) January with Reads How we measure 'reads'. Spin Injection into a Superconductor with Strong Spin-Orbit Coupling T.

Wakamura,1 N. Hasegawa,1 K. Ohnishi,1 Y. Niimi,1 and YoshiChika Otani1,2,* 1Institute for Solid State Physics, University of Tokyo, Kashiwa-no-haKashiwa, ChibaJapan 2RIKEN-CEMS, Hirosawa, Wako, SaitamaJapan (Received 8 October ; published 24 January ).

Spin injection into superconductors Article in Journal of Physics D Applied Physics 35(19) September with 8 Reads How we measure 'reads'. The effect has been found to occur in both low T c (Sn) and high T c (YBa 2 Cu 3 O 7-(delta)) superconductors when either a conventional ferromagnetic metal, permalloy (Ni Fe ), or a colossal magnetoresistive material were used as the source of spin polarization.

Control experiments showed that unpolarized current from a nonmagnetic Author: Michael S. Osofsky, Robert J. Soulen, J. Byers, B. Woodfield, Douglas B. Chrisey, James S. Hor. Spin injection into superconductors: Authors: The spin accumulation competes with the superconductivity and the spin current gives rise to the transverse charge current in SC.

Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts. A microscopic theory of spin excitations and superconductivity in strongly correlated electronic systems as cuprates is discussed.

We argue that in the Mott-Hubbard regime with two Hubbard subbands, there emerges a new energy scale induced by kinematical interaction of electrons with spin fluctuations of the order of electronic kinetic by: 2. Bourges,P. in The Gap Symmetry and Fluctuations in High Temperature Superconductors (ed.

Bok. et al.) – (Plenum, ). Google ScholarCited by:   Fig. 1 (A) Theoretical spin-triplet Josephson junction adapted from (), consisting of two spin-singlet superconductors (S) linked via a noncollinear ferromagnetic trilayer (F L-F C-F R).(B) The conical magnetic configuration of idealized Ho below its Curie temperature (20 K), showing an antiferromagnetic spiral rotating in-plane by θ = 30° per atomic plane and pitched α = 80° by: Thanks to its higher operating temperature, cuprates are now becoming competitors for more ordinary niobium -based superconductors, as well as magnesium diboride superconductors.

High-temperature superconductors (abbreviated high-Tc or HTS) are operatively defined as materials that behave as superconductors at temperatures above nearly °C ( °F). Bilayers of epitaxially compatible superconducting DyBa2Cu3O7−x (DBCO) and ferromagnetic La2/3Ba1/3MnO3 (LBMO) have been grown using molecular beam ep Cited by: 4.

Spin injection from a normal metal into a mesoscopic superconductor Article in Physical review. B, Condensed matter 87(2) December with 15 Reads. Charge ordering with finite wave vector (q ≠ 0) in cuprate superconductors has attracted extensive interests of researchers over the past two decades, since it appears to be a ubiquitous phenomenon among different families of cuprates, and may shed light on understanding the mechanism of high-temperature : Xintong Wang, Yonghao Yuan, Qi-Kun Xue, Wei Li.

Traditional studies that combine spintronics and superconductivity have mainly focused on the injection of spin-polarized quasiparticles into superconducting materials. However, a complete synergy.

Here we use inelastic neutron scattering to determine thewavevector-dependence of spin pairing in La 2−x Sr x CuO 4, the simplest high-temperature superconductor.

We find that the spin Cited by:   This high-resolution method was able to monitor what happens to the electrons of a cuprate sample as it turned into a superconductor. "Normally, superconductors hate magnetism," says.

Electronic nature of high temperature cuprate superconductors Figure 1. Crystal structure of panel shows the layer structure along the c-axis and the right panel the structure of the CuO2 plane. that [25]; for an illuminating account of those heady days, the reader is referred to the bookCited by: Nonlocal injection of spin current into a superconducting Nb wire Article (PDF Available) in Applied Physics Letters 96(19) May with 72 Reads How we measure 'reads'.

(a) Spin-polarized electrons at a ferromagnet (FM)/superconductor (SC) interface. The injected electrons induce a spin-polarization of quasiparticles, while Andreev reflection lowers the transmission of the spin component of the current into the superconductor. (b) Injected spin-current is propagated in a lateral structure as a pure spin current.

Abstract. We demonstrate spin injection into superconducting Nb by employing a spin absorption technique in lateral spin valve structures. Spin currents flowing in a nonmagnetic Cu channel are preferably absorbed into Nb due to its strong spin-orbit interaction, the amount of which dramatically changes below or above the superconducting critical temperature (T C).Cited by: The current flows from the top Au electrode into LSMO through LSCO.

When the current was increased from 1 to 10 μA, the superconducting transition temperature decreased as seen in Fig. 4. This drop is considered to be due to non-equilibrium effects induced by spin-current : M. Lmouchter, H. Endo, Y. Nakamura, M.

Iwayama, Y. Tanaka, M. Suzuki.The quest for room-temperature superconductivity is a rather old one. The first superconductor ever measured, found by H. K. Onnes inwas mercury (Hg), an elemental substance that possesses a very low T c = K.

Such low temperatures require expensive helium cooling; hence, exploiting the characteristic properties of superconductors (vanishing resistivity, perfect diamagnetism) for Cited by: 2.