Transport measurements in the 1-2-3 system CLBLCO in both the oxygen-underdoped and -overdoped regions

Knizhnik, A.; Direktovich, Y; Reisner, G. M.; Goldschmidt, D.; Kuper, C.G.; Eckstein, Y.

doi:10.1016/s0921-4534(99)00363-9

Cited by 25 publications

(28 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to control the amount of oxygen in the samples we followed the procedure known for powder samples of this material [4]. The oxygen composition of the samples has been determined by iodometric titration [9].…”

Section: Severalmentioning

confidence: 99%

See 1 more Smart Citation

Relation between cuprate superconductivity and magnetism: A Raman study of(CaLa)1(BaLa)2Cu3Oy

et al. 2014

View full text Add to dashboard Cite

We present an investigation of charge-compensated antiferromagnetic (Ca x La 1−x )(Ba 1.75−x La 0.25+x )Cu 3 O y single crystals using Raman scattering as well as muon spin rotation. In this system the parameter x controls the Cu-O-Cu superexchange interaction via bond distances and buckling angles. The oxygen content y controls the charge doping. In the absence of doping the two-magnon peak position is directly proportional to the superexchange strength J . We find that both x and y affect the peak position considerably. The Néel temperature determined from muon spin rotation on the same samples independently confirms the strong dependence of the magnetic interaction on x and y. We find a considerable increase in the maximum superconducting transition temperature T max c with J . This is strong evidence of the importance of orbital overlap to superconductivity in this family of cuprates.

show abstract

Section: Severalmentioning

confidence: 99%

“…1(a). They summarize muon spin rotation (μSR) [2,3] and transport [4] experiments performed on powder samples. It can be seen that the transition temperatures to the antiferromagnetic, spin-glass, and superconducting phases (T N , T g , and T c , respectively) are strongly x dependent.…”

Section: Introductionmentioning

confidence: 99%

Relation between cuprate superconductivity and magnetism: A Raman study of(CaLa)1(BaLa)2Cu3Oy

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The range of accessible y's in CLBLCO is so large that samples from the heavily underdoped antiferromagnetic (AFM) parent compounds, to the non-superconducting extreme overdoped, are obtainable. When varying x, nearly concentric domes of T c versus oxygen doping y are formed, with the maximum value of T c varying from 58 K at x = 0.1 to 80 K at x = 0.4 [8], as demonstrated by the open symbols in Fig. 1.…”

mentioning

confidence: 93%

Magnetic analog of the isotope effect in cuprates

et al. 2006

View full text Add to dashboard Cite

We present extensive magnetic measurements of the (CaxLa1−x)(Ba1.75−xLa0.25+x)Cu3Oy system with its four different families (x) having a T max c (x) variation of 28% and minimal structural changes. For each family, we measured the Néel temperature, the anisotropies of the magnetic interactions, and the spin glass temperature. Our results exhibit a universal relation Tc = cJns for all families, where c ∼ 1, J is the in plane Heisenberg exchange, and ns is the carrier density. This relates cuprate superconductivity to magnetism in the same sense that phonon mediated superconductivity is related to atomic mass.The critical temperature for superconductivity T c in metallic superconductors varies with isotope substitution [1]. This observation, known as the isotope effect, played a key role in exposing their mechanism for superconductivity. In contrast, the mechanism for superconductivity in the cuprate is still elusive, but is believed to be of magnetic origin [2]. Verifying this belief would require an experiment similar to the isotope effect, namely, a measurement of T c versus the magnetic interaction strength J, with no other structural changes in the compounds under investigation. Here we present such an experiment using the (Ca x La 1−x )(Ba 1.75−x La 0.25+x )Cu 3 O y (CLBLCO) system with its four different superconducting families, for which maximum T c (T max c ) varies by 28%. This is a large change compared to Sn, which has the strongest isotope effect in nature where T c varies only by 4%. For each family, we measured the Néel Temperature T N and the anisotropies of the magnetic interactions. This allows us to obtain the Heisenberg coupling J. In addition, we determine the spin glass temperature T g of underdoped samples. J, T g and T c allow us to generate a unified phase diagram for magnetism and superconductivity from no doping to over doping. We combine this result with a previous determination of the superconducting carrier density n s [3], and demonstrate experimentally a magnetic analog of the isotope effect.

show abstract

“…This paper reports a study of an intriguing family [3] of 1-2-3 materials (Ca x La (1−x) )(Ba (c−x) La (2−c+x) )Cu 3 O y ("CLBLCO"). An attractive feature of CLBLCO is that, regardless of the values of x and y, it always crystallizes in the tetragonal space group P 4/mmm .…”

Section: Introductionmentioning

confidence: 99%

Structure and a bond-valence-sum study of the 1-2-3 superconductors(CaxLa1−x
Chmaissem
¹
,
Eckstein
²
,
Kuper
³

2001
Phys. Rev. B
36
6
22
1
View full text Add to dashboard Cite

We present a study of the crystal structure of the 1-2-3 superconductor (Ca x La 1−x )(Ba 1.75−x La 0.25+x )Cu 3 O y ("CLBLCO"). Because of the presence of both La and Ba ions in the "Ba" layer, the local symmetry of YBa 2 Cu 3 O y ("YBCO") is lost. One can no longer assume that an "apical" oxygen atom always lies strictly on the line joining CuI and CuII ions, and a Pauling bondvalence calculation is very useful as an adjunct to the Rietveld refinement of the positions of the La and Ba ions. When a Rietveld analysis is performed allowing for the possibility that the apical oxygen atoms may be slightly displaced along the a or b direction, the bond valence sums for both La and Ba are close to the natural oxidation states of these ions.We have also used the bond-valence-sum method to study the mean oxidation states of the CuI and CuII ions in both CLBLCO and YBCO. Our results for YBCO differ from some previously published results. Our main conclusion is that, while the method may be useful in finding the charge con-1 centration on the CuII plane, it definitely does not yield the concentration of mobile holes, nor the concentration of superconducting charge carriers.

show abstract

Transport measurements in the 1-2-3 system CLBLCO in both the oxygen-underdoped and -overdoped regions

Cited by 25 publications

References 27 publications

Relation between cuprate superconductivity and magnetism: A Raman study of(CaLa)1(BaLa)2Cu3Oy

Relation between cuprate superconductivity and magnetism: A Raman study of(CaLa)1(BaLa)2Cu3Oy

Magnetic analog of the isotope effect in cuprates

Structure and a bond-valence-sum study of the 1-2-3 superconductors(CaxLa1−x
Chmaissem
¹
,
Eckstein
²
,
Kuper
³

2001
Phys. Rev. B
36
6
22
1
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Transport measurements in the 1-2-3 system CLBLCO in both the oxygen-underdoped and -overdoped regions

Cited by 25 publications

References 27 publications

Relation between cuprate superconductivity and magnetism: A Raman study of(CaLa)1(BaLa)2Cu3Oy

Relation between cuprate superconductivity and magnetism: A Raman study of(CaLa)1(BaLa)2Cu3Oy

Magnetic analog of the isotope effect in cuprates

Structure and a bond-valence-sum study of the 1-2-3 superconductors(CaxLa1−xChmaissem1, Eckstein2, Kuper3 2001Phys. Rev. B366221View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Structure and a bond-valence-sum study of the 1-2-3 superconductors(CaxLa1−x
Chmaissem
¹
,
Eckstein
²
,
Kuper
³

2001
Phys. Rev. B
36
6
22
1
View full text Add to dashboard Cite