Magneto-resistivity and magnetization investigations of YBCO superconductor added by nano-wires and nano-particles of titanium oxide

Hannachi, E.; Slimani, Y.; Ekicibil, Ahmet; Manikandan, A.; Azzouz, F. Ben

doi:10.1007/s10854-019-01205-3

Cited by 39 publications

(12 citation statements)

References 25 publications

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“…The values of the upper critical fields H c2 in the high critical temperature superconductors (HTSC) are important quantities because they give the most direct information about microscopic parameters such as the superconducting coherence lengths, the magnetic penetration depth, and their anisotropic within the superconducting state. [7] YBa 2 Cu 3 O 7Àδ (YBCO) is one of the most interesting superconductors as its upper critical magnetic field and critical current density are quite large among HTSC; this compound is more exploited for intense magnetic field production, power cables transmission. [8] For these reasons, many recent works focus on YBCO's properties improvement [9] and properties investigation, such as critical temperature prediction, [10] temperature resistivity, transition region broadening, magnetic penetration depth, and coherence length.…”

mentioning

confidence: 99%

“…Recently, several groups had studied the scaling behavior for various samples of YBCO grown under different conditions. [8,[11][12][13][14][15][16][17] Slimani et al investigated the flux pinning properties of YBCO added by WO 3 nanoparticles. [18] Also, the impact of Dy 2 O 3 nanoparticles addition on the properties of porous YBCO ceramics is analyzed by Almessiere et al [19] In this investigation, on the one hand, the magnetization measurements have been performed on high-temperature superconductor's single-crystal YBa 2 Cu 3 O 7Àδ at large ranges of temperature T (15À85 K) and in magnetic fields up to 6 T. The temperature dependence of the magnetic penetration depth is estimated from the slope of the linear M(lnH) dependence in the London regime for three directions of the applied magnetic field with the c-axis (θ ¼ 0 , 30 , and 45 ), θ is the angle between the direction of the applied magnetic field and the crystallographic c-axis.…”

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confidence: 99%

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Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

Hassan

Labrag

Taoufik

et al. 2021

Physica Status Solidi (b)

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At a certain level in the history of superconductivity, it became indispensable to appropriate a microscopic theory that accounts for all the properties that manifest the superconducting materials. In the absence of such a description, we dispose another socalled Ginzburg-Landau (GL) phenomenological theory established in 1950, capable of describing all the properties listed up to now. The basics of this theory rest on the theory of second-order phase transitions founded in 1937 by Lev Landau. The advent of GL theory comes to fill the insufficiency in the London brothers' electrodynamic theory to explain the coexistence of a superconducting phase and a normal phase in a type II superconductor. In addition, it suggests for the first time that the superconducting state is more ordered than the normal state. This is an intuitive thermodynamic theory without a microscopic basis. For this reason, Western scientists did not give it importance. However, the Bardeen-Cooper-Schrieffer theory will come to justify it a posteriori due to the work of Gorkov in 1959 and another version of GL's theory appeared and was called the GLAG theory in honor of these founders Ginzburg, Landau, Abrikosov, and Gorkov. In this new version, the order parameter is directly associated with the Cooper pair wave function. The GL theory is presented in several variants in literature and the intuitive ideas on which they are based seem to be sometimes disconcerting. In contrast, this theory remains very rich because it accounts for the superconductor-normal transition, as well as the thermodynamic, electrodynamic, and quantum effects of the superconducting phase.The theories of V. L. Ginzburg and L. D. Landau highlight two characteristic lengths in the physics of superconductivity [1,2] : 1) The magnetic flux penetration length, known as the London length λ, which defines the length over which magnetic induction can vary in a superconducting material. 2) The coherence length ξ, which represents the spatial dimension of a superconducting pair, i.e., the minimum length over which superconductivity can vary until it disappears. Pairs have reduced dimensions in high-temperature superconductors, where ξ is comparable with the characteristic quantities of the crystal lattice.The quantities λ and ξ diverge for temperatures close to the critical temperature T c . This divergence relates to the weakening of the pairing interaction in the face of thermal agitation and leads to the transition from the superconducting state to the normal state. [3] On the contrary, they allow expressing the critical quantities that delimit the domain of existence of the superconducting state under the effect of an external magnetic field.The variety of behaviors of a superconducting material subjected to an external magnetic field B ¼ μH can be summarized

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confidence: 99%

mentioning

confidence: 99%

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

Hassan

Labrag

Taoufik

et al. 2021

Physica Status Solidi (b)

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“…By applying the magnetic field, the transition is broadened remarkably with the increase of the magnetic field. As shown in Table 1 and Figure 2, for each sample, T c, offset goes to lower values on increasing the magnetic field, resulting in a wider resistive transition ΔT (ΔT = T c,onset − T c,offset ) [2,10]. The width ΔT of superconductingtransition temperatures of the micro bridges' samples in a 7 T magnetic field appears to be nearly 14K.…”

Section: Methodsmentioning

confidence: 89%

“…Indeed, the larger number of grain boundaries and weak bonds among superconducting grains is, the wider ΔT will be [10,11]. The tailing behaviour is known to be correlated with the high thermal energy of vortices and the disorders in the percolation path among grains owing to different directions in polycrystalline compounds [3].…”

Section: Methodsmentioning

confidence: 99%

Irreversibility line and thermally activated flux flow in Micro-bridges of high-temperature superconductor

et al. 2021

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We have studied the electrical resistivity as a function of temperature in Micro-bridges of YBa2Cu3O7-δ deposited by laser ablation on the SrTiO3 substrate face, around superconducting transition region in different magnetic fields. The activation energy U0 was determined and discussed using the Arrhenius relation. The irreversibility line Birr and the upper critical field Bc2were obtained using 10% and 90% criteria of the normal-state resistivity value from ρ (T) curves. A phase diagram of the studied sample is constructed showing the Tg glass line and a very broad vortex-liquid phase regime.

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“…сильной" сверхпроводящей подсистемой, и межгранульные границы, сверхпроводящие свойства в которых значительно подавлены, и перенос сверхпроводящего тока через них осуществляется благодаря эффекту Джозефсона. Достаточно большое количество работ по гранулярным ВТСП было посвящено определению механизмов диссипации в подсистеме межгранульных границ во внешнем магнитном поле [4][5][6][7][8][9][10][11][12][13][14][15]. Однако, зачастую в подобных исследованиях подсистема межгранульных границ, где происходит диссипация, считалась независимой, и при анализе не принимался во внимание необратимый характер зависимостей магнитосопротивления R(H) [16][17][18][19][20][21][22][23][24][25], критического тока I C (H) [26][27][28][29], а также температурных зависимостей R(T ) [30][31][32][33][34][35], измеренных во внешнем магнитном поле.…”

Section: Introductionunclassified

Механизмы, определяющие гистерезис магнитосопротивления гранулярного ВТСП в присутствии парамагнитного вклада, на примере HoBa-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-delta-=/SUB=-

Семенов¹,

Gokhfeld²,

Терентьев³

et al. 2021

Физика Твердого Тела

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The hysteretic magnetoresistance of granular high-temperature superconductor (HTSC) HoBa2Cu3O7-δ is investigated. Superconductors of the YBCO family with magnetic rare earth elements (Nd, Ho, Er, Sm, Yb, Dy) in place of yttrium are characterized by a significant paramagnetic contribution to the total magnetization. Impact of this paramagnetic contribution on the magnetotransport properties is analyzed using the concept of an effective field in an intergranular medium. Lines of magnetic induction from paramagnetic moments do not concentrate in intergranular boundaries, and, thus, have an insignificant effect on magnetotransport properties of granular HTSC. At the same time, there are strong concentration of magnetic flux in the intergranular boundaries due to Meissner currents and Abrikosov vortices. This magnetic flux compression determines the magnetotransport properties of granular HTSCs, including YBCO with magnetic rare earth elements.

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Magneto-resistivity and magnetization investigations of YBCO superconductor added by nano-wires and nano-particles of titanium oxide

Cited by 39 publications

References 25 publications

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

Irreversibility line and thermally activated flux flow in Micro-bridges of high-temperature superconductor

Механизмы, определяющие гистерезис магнитосопротивления гранулярного ВТСП в присутствии парамагнитного вклада, на примере HoBa-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-delta-=/SUB=-

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Magneto-resistivity and magnetization investigations of YBCO superconductor added by nano-wires and nano-particles of titanium oxide

Cited by 39 publications

References 25 publications

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa2Cu3O7−δ

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa2Cu3O7−δ

Irreversibility line and thermally activated flux flow in Micro-bridges of high-temperature superconductor

Механизмы, определяющие гистерезис магнитосопротивления гранулярного ВТСП в присутствии парамагнитного вклада, на примере HoBa-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-delta-=/SUB=-

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Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ

Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa₂Cu₃O_7−δ