Model for the reversible magnetization of high-κ type-II superconductors: Application to high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors

Hao, Zhidong; Clem, John R.; McElfresh, M.; Civale, L.; Malozemoff, A. P.; Holtzberg, F.

doi:10.1103/physrevb.43.2844

Cited by 382 publications

(203 citation statements)

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“…The arrow points to the T c . The shape of susceptibility data and how T c is determined when a double-frequency modulation technique is used have been discussed in detail in a review paper by Struzhkin et al 13 and are based on the HaoClemm theory for reversible magnetization in type II superconductors 28 . Basically, T c in the ac-susceptibility data for Pr 1.83 Ce 0.17 CuO 4 is marked by the higher temperature "end" of the peak as shown in Fig.…”

Section: Figmentioning

confidence: 99%

High-pressure effects on single crystals of electron-doped Pr2−xCexCuO4
Rotundu
¹
,
Struzhkin
²
,
Somayazulu
³

et al. 2013
Phys. Rev. B
18
1
9
0
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We present high pressure diamond anvil cell synchrotron X-ray, resistivity, and ac-susceptibility measurements on the electron-doped cuprate Pr2−xCexCuO4 to much higher pressures than previously reported. At 2.72 GPa between 88 and 98% of the superconducting T ′ phase of the optimally doped Pr1.85Ce0.15CuO4 transforms into the insulating phase T. With application of pressure, the T phase becomes more insulating, so we present here what may be the first example of electron-doping in the T structure. The results have implications for the search for ambipolar high-Tc cuprate superconductors. The Tc of the remaining 2-12% T ′ phase is suppressed continuously from 22 K to 18.5 K at about 14 GPa. Remarkably, the Tc of the overdoped Pr1.83Ce0.17CuO4 remains practically unchanged even at 32 GPa.

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Section: Figmentioning

confidence: 99%

High-pressure effects on single crystals of electron-doped Pr2−xCexCuO4
Rotundu
¹
,
Struzhkin
²
,
Somayazulu
³

et al. 2013
Phys. Rev. B
18
1
9
0
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“…Note that recently Clem's trial function (1) was applied to the study of the vortex core structure in superconductors with mixed (d+s) two-component order parameter [22]. Hao et al [23] (see also Ref. [24]) extended the model [17] to larger magnetic fields up to H c2 through the linear superposition of the field profiles of individual vortices.…”

Section: Introductionmentioning

confidence: 99%

“…For the case of low fields, Hao and Clem argued [25] that the London model is quantitatively incorrect (it does not give the correct asymptotics at H → H c1 ) since the contribution of the vortex cores to the total free energy could not be taken into account in this approach. The Clem-Hao model was further extended to include anisotropy [23,26]. This approximation is now widely used for the analysis of the experimental data on magnetization of type II superconductors [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…The application of this approach to the entire field range H c1 < H < H c2 leads to an appreciable disagreement between the Clem-Hao model and Abrikosov's high-field result [30]. In the original papers of Hao et al [23,25,26], this disagreement was made up by the use of a non-selfconsistent field dependence of the variational parameters. Then, in calculating the magnetic free energy in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Approximate Ginzburg-Landau solution for the regular flux-line lattice: Circular cell method

et al. 2001

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A variational model is proposed to describe the magnetic properties of type-II superconductors in the entire field range between Hc1 and Hc2 for any values of the Ginzburg-Landau parameter κ > 1/ √ 2. The hexagonal unit cell of the triangular flux-line lattice is replaced by a circle of the same area, and the periodic solutions to the Ginzburg-Landau equations within this cell are approximated by rotationally symmetric solutions. The Ginzburg-Landau equations are solved by a trial function for the order parameter. The calculated spatial distributions of the order parameter and the magnetic field are compared with the corresponding distributions obtained by numerical solution of the Ginzburg-Landau equations. The comparison reveals good agreement with an accuracy of a few percent for all κ values exceeding κ ≈ 1. The model can be extended to anisotropic superconductors when the vortices are directed along one of the principal axes. The reversible magnetization curve is calculated and an analytical formula for the magnetization is proposed. At low fields, the theory reduces to the London approach at κ ≫ 1, provided that the exact value of Hc1 is used. At high fields, our model reproduces the main features of the well-known Abrikosov theory. The magnetic field dependences of the reversible magnetization found numerically and by our variational method practically coincide. The model also refines the limits of some approximations which have been widely used. The calculated magnetization curves are in a good agreement with experimental data on high-Tc superconductors.

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“…The measured magnetization data were analyzed using the high-field scaling theory proposed by Tešanović and Andreev,[12] the modified Lawrence-Doniach model, [13][14][15] and the Hao-Clem model. [16][17][18][19][20] From these analyses, we found that Cu-1234 had a strong 2D nature which was caused by an effective reduction of the number of CuO 2 planes due to an inequivalent hole distribution.The details on the sample preparation under a high-pressure condition (∼ 4 Gpa) are given elsewhere.[21] The lattice parameters, a = b = 3.858Å and c = 17.98Å, were obtained from X-ray diffraction. To obtain a c-axis aligned sample, we employed the Farrell method.…”

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confidence: 95%

Two-dimensional nature of four-layer cuprate superconductors

et al. 2001

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The magnetization of the four-layer superconductor CuBa2Ca3Cu4O 12−δ with Tc ≃ 117 K is presented. The high-field magnetization around Tc(H) follows the exact two-dimensional scaling function given by Tešanović and Andreev. This feature is contrary to the inference that the interlayer coupling becomes strong if the number of CuO2 planes in a unit cell increases. Also, the fluctuationinduced susceptibility in the low-field region was analyzed by using the modified Lawrence-Doniach model. The effective number of independently fluctuating CuO2 layers per unit cell, g eff , turned out to be ≃ 2 rather than 4, which indicated that two among the four CuO2 layers were in states far from their optimal doping levels. This result could explain why CuBa2Ca3Cu4O 12−δ shows two-dimensional behavior.74.25. Bt, 74.40.+k, 74.72.Jt, 74.72.Gr, Within a high-T c homologous series, the T c is expected to increase with the number of CuO 2 planes per unit cell, n, because an increase in n means an increase in the number of CuO 2 planes per unit volume and thereby increases in the charge-carrier density and the coupling between the conducting planes. In fact, the T c increases with n within a high-T c family. However, this tendency does not persist above a certain value of n. For example, within the HgBa 2 Ca n−1 Cu n O 2n+2+δ family, the T c increases with n up to n = 3, but for n = 4 the value is lower by about 10 K in comparison with the value for n = 3.For compounds with n ≥ 3, the unit cells contain two structurally different CuO 2 planes. In the case of HgBa 2 Ca 3 Cu 4 O 10+δ (Hg-1234), among the four layers, two layers contain Cu with square-planar coordination (Type-A), and the other two contain Cu with pyramidal coordination (Type-B). Yamauchi and Karppinen [1] claimed from their bond-valence-sum (BVS) calculations that the charge carriers can be inhomogeneously distributed between Type-A and Type-B CuO 2 planes and that the holes may be concentrated mainly in the Type-A CuO 2 planes.As a consequence of the inequivalent hole distribution, the "microscopic" T c 's of the Type-A and Type-B planes will differ from each other.[2] The difference between the lower and the higher T c 's becomes severe as the degree of imbalance in the hole distribution increases. Thus, at temperatures around the higher T c , one of the two different kinds of CuO 2 planes does not play the role of a superconducting layer by itself; hence the interlayer spacing in the system can be effectively quite large.In our previous works, [3,4] we demonstrated that in high-field region, the thermal fluctuations of Hg-1234 show two-dimensional (2D) scaling behavior around T c (H). Furthermore, the strong anisotropic nature of this compound as observed through magnetic torque measurements by Zech et al.[5] They reported the anisotropy ratio, γ = λ c /λ ab , of Hg-1234 to be about 52. These results implying a weak interlayer coupling are consistent with our viewpoint that the inequivalent distribution of holes can effectively cause a large interlayer spacing.The a...

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Model for the reversible magnetization of high-κ type-II superconductors: Application to high-Tcsuperconductors

Cited by 382 publications

References 25 publications

High-pressure effects on single crystals of electron-doped Pr2−xCexCuO4
Rotundu
¹
,
Struzhkin
²
,
Somayazulu
³

et al. 2013
Phys. Rev. B
18
1
9
0
View full text Add to dashboard Cite

High-pressure effects on single crystals of electron-doped Pr2−xCexCuO4
Rotundu
¹
,
Struzhkin
²
,
Somayazulu
³

et al. 2013
Phys. Rev. B
18
1
9
0
View full text Add to dashboard Cite

Approximate Ginzburg-Landau solution for the regular flux-line lattice: Circular cell method

Two-dimensional nature of four-layer cuprate superconductors

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Model for the reversible magnetization of high-κ type-II superconductors: Application to high-Tcsuperconductors

Cited by 382 publications

References 25 publications

High-pressure effects on single crystals of electron-doped Pr2−xCexCuO4Rotundu1, Struzhkin2, Somayazulu3 et al. 2013Phys. Rev. B18190View full textAdd to dashboardCite

High-pressure effects on single crystals of electron-doped Pr2−xCexCuO4Rotundu1, Struzhkin2, Somayazulu3 et al. 2013Phys. Rev. B18190View full textAdd to dashboardCite

Approximate Ginzburg-Landau solution for the regular flux-line lattice: Circular cell method

Two-dimensional nature of four-layer cuprate superconductors

Contact Info

Product

Resources

About

High-pressure effects on single crystals of electron-doped Pr2−xCexCuO4
Rotundu
¹
,
Struzhkin
²
,
Somayazulu
³

et al. 2013
Phys. Rev. B
18
1
9
0
View full text Add to dashboard Cite

High-pressure effects on single crystals of electron-doped Pr2−xCexCuO4
Rotundu
¹
,
Struzhkin
²
,
Somayazulu
³

et al. 2013
Phys. Rev. B
18
1
9
0
View full text Add to dashboard Cite