Interlayer coupling and superconducting properties of the triple-layer compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mrow><mml:mn>0.6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>0.4</mml:mn></mml:mrow></mml:msu

et al. 2005

Phys. Rev. B

Self Cite

We report the reversible magnetization of the Ca 2−x Na x CuO 2 Cl 2 ͑x = 0.18͒ single crystal for H ʈ c up to 1.2 T to study the effect of oxygen replacement by chlorine at the apical site. The superconducting transition temperature T c ͑ϳ27 K͒ of this single crystal is the highest reported in this family. Various thermodynamic parameters, such as the penetration depth ab ͑0͒, the coherence length ab ͑0͒, the critical field H c ͑0͒, the upper critical field H c2 ͑0͒ and the Ginzburg-Landau parameter , are also reported. Compared to the iso-structural compound La 1.82 Sr 0.18 CuO 4 with apical oxygen, Ca 1.82 Na 0.18 CuO 2 Cl 2 has two significant differences: ͑1͒ ab ͑0͒ is larger, so the Cooper pair density is quite reduced, and ͑2͒ the anisotropic nature is more enhanced. From these observations, chlorine at the apical site is thought to be less effective than oxygen in supplying charge carriers to the CuO 2 planes; as a result, the interlayer coupling between the CuO 2 planes is weakened.

Section: Resultssupporting

confidence: 54%

Effect of apical oxygen replacement by chlorine on the thermodynamic properties ofCa1.82Na0.18CuO2Cl2single crystals

et al. 2005

Phys. Rev. B

Self Cite

“…2. Temperature dependence of the reversible magnetization, 4M (T), in the field range 0.1 TрHр2.5 T. The irreversible temperatures are indicated as arrows.the cores, this variational model permits a reliable description of the reversible magnetization in the entire mixed state and an accurate determination of the thermodynamic parameters 32,37,39. In the Hao-Clem model, the reversible magnetization indimensionless form, 4M Јϵ4M /&H c (T),is a universal function ͑temperature independent͒ of magnetic field, HЈ ϵH/&H c (T), for a given value of the GL parameter .…”

mentioning

confidence: 99%

Reversible magnetization ofMgB2single crystals with a two-gap nature

et al. 2004

Self Cite

We present reversible magnetization measurements on MgB 2 single crystals in magnetic fields up to 2.5 T applied parallel to the crystal's c axis. This magnetization is analyzed in terms of the Hao-Clem model, and various superconducting parameters, such as the critical fields ͓H c (0) and H c2 (0)], the characteristic lengths ͓͑0͒ and ͑0͔͒, and the Ginzburg-Landau parameter, are derived. The temperature dependence of the magnetic penetration depth (T), obtained from the Hao-Clem analysis, could not be explained by theories assuming a single gap. Our data are well described by using a two-gap model.

“…[19] In our study, we apply the Hao-Clem model to describe our magnetization data. [10][11][12] Since the model is derived from the phenomenological Ginzburg-Landau (GL) theory, our result is justified in the GL framework. However, we judge our result not to be model dependent particularly from the following consideration: The open symbols in the inset of Fig.…”

mentioning

confidence: 90%

“…Additional evidence for 3D superconductivity can be found from the scaling analysis [10][11][12][13]24,29,30] of the fluctuation-induced magnetization for the high-field region. According to Ullah and Dorsey, [31] the magnetization in the critical region scales with the scaling variable of A[T − T c (H)]/(T H) n , where A is a field and transition temperature-independent coefficient, and n is 2/3 for a 3D system and 1/2 for a 2D system.…”

mentioning

confidence: 99%

Three-dimensional superconductivity in the infinite-layer compound Sr0.9La0.1CuO2 in entire region below Tc

Jung

Solid State Communications

et al. 2002

Self Cite

The infinite-layer compound ACuO2 (A = alkaline-earth ions) is regarded as the most suitable material for exploring the fundamental nature of the CuO2 plane because it does not contain a charge-reservoir block, such as a rock-salt or a fluorite like block. We report that superconductivity in the infinite-layer compound Sr0.9La0.1CuO2 is of a three-dimensional nature, in contrast to the quasi two-dimensional superconducting behavior of all other cuprates. The key observation is that the c-axis coherence length is longer than the c-axis lattice constant even at zero temperature. This means that the superconducting order parameter of one CuO2 plane overlaps with those of neighboring CuO2 planes all the temperatures below the Tc. Among all cuprates, only the infinitelayer superconductor shows such a feature.