Low temperature phase transition and superconductivity in ( Nd)SrCuO

Büchner, B.; Braden, M.; Cramm, M.; Schlabitz, W.; Hoffels, O.; Braunisch, W.; Müller, Ralf; Heger, G.; Wohlleben, D.

doi:10.1016/0921-4534(91)91675-t

Cited by 73 publications

(37 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, irrespective of doping, the transition temperature extends up to rather high temperatures T LT ≈ 120 ± 10 K, i.e. much higher than in in La 2−x Ba x CuO 4 and La 1.6−x Nd 0.4 Sr x CuO 4 where T LT ≈ 55 K and T LT ≈ 70 K, respectively [52,53,56,57,59]. Bulk superconductivity with a considerable critical temperature T c is suppressed in La 1.8−x Eu 0.2 Sr x CuO 4 over a wide doping range up to x 0.2.…”

Section: Nernst Effect and Sdw Fluctuations In The Iron-based Supercomentioning

confidence: 99%

“…In the case of stripe order, these materials exhibit stripe-like arrangements of alternating hole-rich and antiferromagnetic regions, where in all these materials an intimate interplay between structure, stripe order and superconductivity is present. More specifically, bulk superconductivity is suppressed in favor of static stripe order where the latter is stabilized through a particular tilting pattern of the CuO 6 octahedra in the lowtemperature tetragonal structural phase (LTT-phase) [23,38,47,52,53,54]. In the prototype stripe ordering compound La 2−x Ba x CuO 4 the LTT phase is only present in a limited doping range around x = 1/8 [55].…”

Section: Nernst Effect and Sdw Fluctuations In The Iron-based Supercomentioning

confidence: 99%

See 1 more Smart Citation

Nernst Effect of Iron Pnictide and Cuprate Superconductors: Signatures of Spin Density Wave and Stripe Order

Heß

2012

NATO Science for Peace and Security Series B: Physics and Biophysics

View full text Add to dashboard Cite

The Nernst effect has recently proven a sensitive probe for detecting unusual normal state properties of unconventional superconductors. In particular, it may sensitively detect Fermi surface reconstructions which are connected to a charge or spin density wave (SDW) ordered state, and even fluctuating forms of such a state. Here we summarize recent results for the Nernst effect of the iron pnictide superconductor LaO 1−x F x FeAs, whose ground state evolves upon doping from an itinerant SDW to a superconducting state, and the cuprate superconductor La 1.8−x Eu 0.2 Sr x CuO 4 which exhibits static stripe order as a ground state competing with the superconductivity. In LaFeAsO 1−x F x , the SDW order leads to a huge Nernst response, which allows to detect even fluctuating SDW precursors at superconducting doping levels where long range SDW order is suppressed. This is in contrast to the impact of stripe order on the normal state Nernst effect in La 1.8−x Eu 0.2 Sr x CuO 4 . Here, though signatures of the stripe order are detectable in the temperature dependence of the Nernst coefficient, its overall temperature dependence is very similar to that of La 2−x Sr x CuO 4 , where stripe order is absent. The anomalies which are induced by the stripe order are very subtle and the enhancement of the Nernst response due to static stripe order in La 1.8−x Eu 0.2 Sr x CuO 4 as compared to that of the pseudogap phase in La 2−x Sr x CuO 4 , if any, is very small.

show abstract

Section: Nernst Effect and Sdw Fluctuations In The Iron-based Supercomentioning

confidence: 99%

Section: Nernst Effect and Sdw Fluctuations In The Iron-based Supercomentioning

confidence: 99%

Nernst Effect of Iron Pnictide and Cuprate Superconductors: Signatures of Spin Density Wave and Stripe Order

Heß

2012

NATO Science for Peace and Security Series B: Physics and Biophysics

View full text Add to dashboard Cite

show abstract

“…2(a-c). 29,57,60 In the LTO phase,the octahedra tilt by an angle Φ about the tetragonal [1,1,0] t axis which is diagonal to the CuO 2 square lattice and defines the orthorhombic [1,0,0] o axis [ Fig. 2(b)].…”

Section: A Crystal Structurementioning

confidence: 99%

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
304
43
411
2
View full text Add to dashboard Cite

The correlations between stripe order, superconductivity, and crystal structure in La2−x Bax CuO4 single crystals have been studied by means of x-ray and neutron diffraction as well as static magnetization measurements. The derived phase diagram shows that charge stripe order (CO) coexists with bulk superconductivity in a broad range of doping around x = 1/8, although the CO order parameter falls off quickly for x = 1/8. Except for x = 0.155, the onset of CO always coincides with the transition between the orthorhombic and the tetragonal low temperature structures. The CO transition evolves from a sharp drop at low x to a more gradual transition at higher x, eventually falling below the structural phase boundary for optimum doping. With respect to the interlayer CO correlations, we find no qualitative change of the stripe stacking order as a function of doping, and in-plane and out-of-plane correlations disappear simultaneously at the transition. Similarly to the CO, the spin stripe order (SO) is also most pronounced at x = 1/8. Truly static SO sets in below the CO and coincides with the first appearance of in-plane superconducting correlations at temperatures significantly above the bulk transition to superconductivity (SC). Indications that bulk SC causes a reduction of the spin or charge stripe order could not be identified. We argue that CO is the dominant order that is compatible with SC pairing but competes with SC phase coherence. Comparing our results with data from the literature, we find good agreement if all results are plotted as a function of x ′ instead of the nominal x, where x ′ represents an estimate of the actual Ba content, extracted from the doping dependence of the structural transition between the orthorhombic phase and the tetragonal high-temperature phase.

show abstract

“…10 The preparation is described in Ref. 11. Susceptibility measurements at 0.001 T show a superconducting transition temperature of 5 K. The intensity Ĩ multiplied by T and corrected for T 2 is shown in Fig.…”

mentioning

confidence: 99%

Spin dynamics and ordering of a cuprate stripe antiferromagnet

et al. 2000

View full text Add to dashboard Cite

In La 1.48 Nd 0.4 Sr 0.12 CuO 4 the 139 La and 63 Cu nuclear quadrupole resonance relaxation rates and signal wipeout upon lowering temperature are shown to be due to purely magnetic fluctuations. They follow the same renormalized classical behavior as seen in neutron data, when the electronic spins order in stripes, with a small spread in spin stiffness ͑15% spread in activation energy͒. The La signal, which reappears at low temperatures, is magnetically broadened and experiences additional wipe out due to slowing down of the Nd fluctuations. DOI: 10.1103/PhysRevB.63.020507 PACS number͑s͒: 74.72.Dn, 76.60.Ϫk, 75.30.Ds, 75.40.Gb Strongly correlated electron systems such as layered cuprates exhibit very unusual properties. One of the most interesting among them is the coexistence of superconductivity with local antiferromagnetism ͑AF͒-a fingerprint of the topological effects of doping of AF insulators by holes. The charges segregate into a periodical array of stripes separating antiphase antiferromagnetic domains. Experimental evidence for stripe correlations has been provided by neutron studies in Nd-doped La 1.875 Sr 0.125 CuO 4 and in other cuprates and nickelates. 1,2 The spatial organization of the stripe structures is a subject of much debate. 3-8 Stripe formation is characterized by the temperatures of charge (T charge ) and spin T spin ordering with T charge ϾT spin . Since these different types of order coexist on the microscopic level, local methods of analysis, like NMR or nuclear quadrupole resonance ͑NQR͒, are well suited to see their interrelation. One striking feature in the NMR data is the wipe-out effect. In Cu-NQR experiments on a number of Sr doped La 2 CuO 4 samples, Hunt et al. 6 showed a correlation between the amount of the intensity loss and the development of charge order of the stripe phase. Curro et al. 7 found strong Cu wipe-out effect in their NMR experiments on La 2ϪyϪx Eu y Sr x CuO 4 and showed that this effect could be accounted for by a wide ͑100%͒ distribution in the energy of the thermally activated correlation times that determine the relaxation processes-so-called glassy behavior.In this communication the role of slow magnetic fluctuations is elucidated. We show that the variation of the line shape as well as wipe-out and relaxation effects probe the growing spin order in the stripe phase. Our investigation takes profit of the NQR frequency range of 139 La and 63 Cu, and especially of the low frequencies and relatively small line widths of La NQR in La 1.48 Nd 0.4 Sr 0.12 CuO 4 . In this compound both Cu and La exhibit strong wipe-out effects. Because La ͑contrary to Cu͒ nuclei are relatively weakly coupled to the electronic spins in the CuO 2 planes, La NQR signals can be followed down to the spin-ordering temperature, as seen by SR. Using the spin correlation times extracted from the activated La spin-lattice relaxation rates we are able to predict precisely these wipe-out features by introducing a spread of only 15% in the activation energy. Within experimental error t...

show abstract

Low temperature phase transition and superconductivity in ( Nd)SrCuO

Cited by 73 publications

References 5 publications

Nernst Effect of Iron Pnictide and Cuprate Superconductors: Signatures of Spin Density Wave and Stripe Order

Nernst Effect of Iron Pnictide and Cuprate Superconductors: Signatures of Spin Density Wave and Stripe Order

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
304
43
411
2
View full text Add to dashboard Cite

Spin dynamics and ordering of a cuprate stripe antiferromagnet

Contact Info

Product

Resources

About

Low temperature phase transition and superconductivity in ( Nd)SrCuO

Cited by 73 publications

References 5 publications

Nernst Effect of Iron Pnictide and Cuprate Superconductors: Signatures of Spin Density Wave and Stripe Order

Nernst Effect of Iron Pnictide and Cuprate Superconductors: Signatures of Spin Density Wave and Stripe Order

Stripe order in superconducting La2−xBaxCuOHücker1, Zimmermann2, Gu3 et al. 2011Phys. Rev. B304434112View full textAdd to dashboardCite

Spin dynamics and ordering of a cuprate stripe antiferromagnet

Contact Info

Product

Resources

About

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
304
43
411
2
View full text Add to dashboard Cite