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Gasumyants, V. É.; Elizarova, M. V.; Suryanarayanan, R.

doi:10.1103/physrevb.61.12404

Cited by 21 publications

(15 citation statements)

References 61 publications

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“…For Pr@Ba, the valence state of copper reduces more rapidly and the oxygen content is smaller than that for the La@Ba substitution. Similar results have been obtained for Sm123 and Y123 [12]. Here, the oxygen content increases from 6.94 (x = 0) to 7.10 (x = 0.35) and OT transition occurs at x = 0.3-0.35.…”

Section: Structural Propertiessupporting

confidence: 87%

“…Another comparative study is reported in Ref. [12]. The Pr@Ba in Sm123 affects the SC properties much stronger and, as a result, the Sm123 system becomes non-SC at x = 0.3.…”

Section: Normal State Transportmentioning

confidence: 93%

“…In the case of Pr@Ba in Sm123 for low x, the temperature dependence of the thermopower S is almost temperature independent at T > 150 -200 K [12]. With increasing doping level x the S(T) dependence at high temperature becomes stronger.…”

Section: Thermal Propertiesmentioning

confidence: 96%

“…Many experiments have been carried out for Pr@Ba on samples of Pr123 [6, 9 -12], Y123 [13,14], Sm123 [12], Eu123 [15,16], Gd123 [17], and other rare earth elements R@Ba such as La and Eu@Ba in Pr123 [18], La@Ba in Y123 [14], or in Pr123 [4], Nd@Ba in Nd123 [13,19], Ho,Y and Ca@Pr in Pr123 [20], Ba@Pr in Pr123 [21,22]. Through these experiments different structural and valence modifications related to Pr are reported.…”

Section: Structural Propertiesmentioning

confidence: 99%

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Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Akhavan

2004

Physica Status Solidi (b)

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In spite of the vast amount of experimental and theoretical knowledge accumulated in HTSC, the nature of the interaction driving charge carriers to form Cooper pairs below T c is still unknown. To elucidate the controversial insulating/SC Pr123, the substitution of Pr at Ba site (Pr@Ba) with Ba at Pr site (Ba@Pr) in R123 is compared and reviewed. This might shed some light on the microscopic origin of HTSC.

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Section: Structural Propertiessupporting

confidence: 87%

“…Another comparative study is reported in Ref. [12]. The Pr@Ba in Sm123 affects the SC properties much stronger and, as a result, the Sm123 system becomes non-SC at x = 0.3.…”

Section: Normal State Transportmentioning

confidence: 93%

Section: Thermal Propertiesmentioning

confidence: 96%

Section: Structural Propertiesmentioning

confidence: 99%

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Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Akhavan

2004

Physica Status Solidi (b)

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“…The variation in the oxygen content and the O-T phase transition, which is attributed to a random ordering of the excess oxygen in the CuO chains, have been reported in other Ln(BaPr)-123 systems: in Gd(BaPr)-123 with O-T at x = 0.20 [26], and in Sm(BaPr)-123 with O-T at x = 0.35 [27]. The same results have been reported for the Nd(BaPr)-123 system [28], and for substitution of Ba by other trivalent rare-earth elements, e.g., La or Eu [29], which shows that Pr at Ba sites seems to influence the structure like other trivalent ions.…”

Section: Resultsmentioning

confidence: 82%

Structural aspects and the conduction mechanism of Ln(Ba_2–xPr_x)Cu₃O_7+δ (Ln = Tm, Lu)

Mokhtari

Akhavan

2007

Physica Status Solidi (b)

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TmBa 2-x Pr x Cu 3 O 7+δ and LuBa 2-x Pr x Cu 3 O 7+δ samples with 0.0 < x ≤ 1.0 have been prepared by a solid-state reaction technique. The occurrence of the orthorhombic to tetragonal phase transition, increasing of oxygen content with the increase of Pr doping, and the existence of solubility limit in both systems confirm the correct substitution of Pr at Ba sites. The solubility limit for Pr in the Lu-based samples is less than 0.7, which is less than x = 0.90 for the Tm-based samples. The T c depression versus doping content in both systems shows that depression of superconductivity by Pr at Ba sites is mostly due to the holefilling/localization effects. Also, in the Tm-based system, the metal -insulator transition occurs at x c MIT ≈ 0.30, and the superconductor -insulator transition occurs at x c SIT = 0.45, but in the Lu-based system, x c MIT ≈ 0.35 and x c SIT = 0.50. In the normal state, for both systems with x < x c MIT , the Coulomb gap phase is dominant, whereas for the samples with Pr content x c MIT ≤ x < x c c SIT , two-dimensional variable-range hopping, and for x > x c SIT , three-dimensional variable-range hopping are the dominant conduction mechanisms.

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Role of Pr/Ba disorder in Pr123 superconductor

Khosroabadi

Modarres-Zadeh

Taheri

et al. 2004

phys. stat. sol. (c)

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O 7-δ samples (0.0 ≤ x ≤ 0.6) is prepared by the standard solid state reaction technique. X-ray measurements confirm the formation of the 123 phase for x ≤ 0.3, but for 0.4 ≤ x ≤ 0.6, due to the solubility limit, the 123 phase is not a dominant phase. Resistivity measurements show the increasing of resistivity with the increase of Ba-doping up to about x=0.08, and then decreases in the 123 phase up to x = 0.3. There is no observation of superconducting state in our samples, but we observe the sharp decrease of resistivity for x>0.1, which is related to possible superconductivity in Pr123 system by Ba-doping. It is concluded that the Pr/Ba disorder has important effect in the transport electrical properties, specially occuring a superconducting state in Pr123. It is also suggested that extra Ba concentration in Pr123 system can create superconducting state such as in Ca-doped Pr123.1 Introduction Although, tremendous amount of research have been carried out for understanding the high temperature superconductivity (HTSC) mechanism, there is not yet any complete theory for describing it. Research on metal-insulator and superconductor-insulator transitions (MIT & SIT), magnetic transitions, and phase diagrams can help us to this understanding. One singularity in the rare earth-based HTSC is the suppression of superconductivity in RBa 2 Cu 3 O 7 (R123) family (R is Y and rare earth elements except Ce, Pm, and Tb) by Pr-doping in the Ba [1] or R [2] sites, and then, the Pr123 system is the only R123 orthorhombic structure with insulator behaviour. So, the role of Pr in the superconductorinsulator anomaly could help to understand the mechanism of superconductivity, at least in R123. Models such as pair breaking [3], hole filling [4], hole localization [5], and Pr/Ba disorder [6] have been considered for explaining this anomaly. Within these models, no single complete and convincing model exists for describing the experimental data on the Pr anomaly. Ref. [7] gives a more complete survey on these models for solving the Pr anomaly.While, many researchers are seeking to find the answer to the insulating Pr123 through new models or the combination of the above models [8], some groups have reported superconductivity in thin films [9], single crystal [10], and powder and film samples [11] of Pr123. These observations have caused some confusion on the Pr anomaly, and renew the study of the Pr anomaly by the Pr/Ba disorder in RPr123. In some recent reports, the nominal substitution of Pr at Ba site has been discussed for the determination of the role of Pr/Ba disorder in the anomalous behaviour of Pr123. So, before attempting to solve the Pr problem, it should be settled whether Pr123 is really a superconductor or an insulator. Zou et al. is one of the groups who have reported superconductivity in Pr123 in their samples grown by travelling-solventfloating-zone (TSFZ) method [12]. Of course, this observation is in contrast to many other reports indicating that Pr123 is indeed on insulator. Observation of superconductivity in Pr ...

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Effect of praseodymium on the normal-state and superconducting properties ofRBa2Cu3

Cited by 21 publications

References 61 publications

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Structural aspects and the conduction mechanism of Ln(Ba_2–xPr_x)Cu₃O_7+δ (Ln = Tm, Lu)

Role of Pr/Ba disorder in Pr123 superconductor

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Effect of praseodymium on the normal-state and superconducting properties ofRBa2Cu3

Cited by 21 publications

References 61 publications

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Structural aspects and the conduction mechanism of Ln(Ba2–xPrx)Cu3O7+δ (Ln = Tm, Lu)

Role of Pr/Ba disorder in Pr123 superconductor

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Structural aspects and the conduction mechanism of Ln(Ba_2–xPr_x)Cu₃O_7+δ (Ln = Tm, Lu)