Structural phase transformations and superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="normal">x</mml:mi></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">Ba</mml:mi></mml

Axe, J. D.; Moudden, A. H.; Hohlwein, D.; Cox, D. E.; Mohanty, K. M.; Moodenbaugh, A. R.; Xu, Youwen

doi:10.1103/physrevlett.62.2751

Cited by 661 publications

(263 citation statements)

References 24 publications

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“…The sign of the shear deformation xy depends on the sign of Q − 3 (q 1 ) 2 − Q − 3 (q 2 ) 2 , a result similar to that given in Ref. 33. As the temperature is reduced through the value T 3 , a distortion of symmetry X − 3 appears.…”

supporting

confidence: 60%

Symmetry analysis for the Ruddlesden-Popper systems Ca3Mn2O7and Ca
Harris
¹

2011
Phys. Rev. B

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We perform a symmetry analysis of the zero-temperature instabilities of the tetragonal phase of Ca 3 Mn 2 O 7 and Ca 3 Ti 2 O 7 which is stable at high temperature.We introduce order parameters to characterize each of the possible lattice distortions to construct a Landau free energy which elucidates the proposed group-subgroup relations for structural transitions in these systems. We include the coupling between the unstable distortion modes and the macroscopic strain tensor. We also analyze the symmetry of the dominantly antiferromagnetic ordering which allows weak ferromagnetism. We show that in this phase the weak ferromagnetic moment and the spontaneous ferroelectric polarization are coupled, so that by rotating one of these orderings by applying an external electric or magnetic field one can rotate the other ordering.We discuss the number of different domains (including phase domains) which exist in each of the phases and indicate how these may be observed. First-principles calculations of Yildirim corroborate our assertion that domain walls in the nonferroelectric phase are narrow. We perform a symmetry analysis of the zero-temperature instabilities of the tetragonal phase of Ca 3 Mn 2 O 7 and Ca 3 Ti 2 O 7 which is stable at high temperature. We introduce order parameters to characterize each of the possible lattice distortions to construct a Landau free energy which elucidates the proposed group-subgroup relations for structural transitions in these systems. We include the coupling between the unstable distortion modes and the macroscopic strain tensor. We also analyze the symmetry of the dominantly antiferromagnetic ordering which allows weak ferromagnetism. We show that in this phase the weak ferromagnetic moment and the spontaneous ferroelectric polarization are coupled, so that by rotating one of these orderings by applying an external electric or magnetic field one can rotate the other ordering. We discuss the number of different domains (including phase domains) which exist in each of the phases and indicate how these may be observed. First-principles calculations of Yildirim corroborate our assertion that domain walls in the nonferroelectric phase are narrow. Disciplines Physical Sciences and Mathematics | Physics

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supporting

confidence: 60%

Symmetry analysis for the Ruddlesden-Popper systems Ca3Mn2O7and Ca
Harris
¹

2011
Phys. Rev. B

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“…2,6,11,28,75 The detection of CO in bulk SC crystals with x far below and far above x = 1/8 is certainly the most significant finding. The full picture, however, becomes clear only when considering the relationship between the various properties and transition temperatures.…”

Section: Discussionmentioning

confidence: 95%

“…3(b)], which is very similar to published polycrystal data. 6,42,46 For stoichiometric oxygen content, 56 the difference between a crystal's T HT value and this line can be used to estimate the deviation of its actual Ba concentration x ′ from the nominal x. Overall the data in Fig.…”

Section: A Crystal Structurementioning

confidence: 99%

“…2, has been studied intensively. 6 So far most diffraction results were obtained on polycrystals, 6,7,57 and only recently have single-crystal data been reported. 18,46,59 In the doping range considered here, La 2−x Ba x CuO 4 undergoes two structural transitions with decreasing temperature: a second-order transition from HTT to LTO, and a first-order transition from LTO to another low temperature phase which can either be LTT or the low-temperature less-orthorhombic (LTLO) phase (space group P ccn) which is a possible intermediate phase between LTO and LTT.…”

Section: A Crystal Structurementioning

confidence: 99%

“…In the LTT phase, the tilt axis runs parallel to the square lattice, but its direction alternates between [1,0,0] t and [0,1,0] t in adjacent planes. 6,12,57 In the LTLO phase, the tilt axis points along an intermediate in-plane direction. 29 The structural properties in this section were obtained with XRD, while data from ND are presented in Sec.…”

Section: A Crystal Structurementioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2011
Phys. Rev. B
305
43
411
2
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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.

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Crystal structures of Copper‐Based High‐T_c Superconductors

Aranda

1994

Advanced Materials

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Many copper‐oxide‐based superconducting compounds have been synthesized in recent years–currently more than 30 families are known, with superconducting transition temperatures up to 133 K. The structures of the various families are described, including La2CuO4, YBa2Cu3O7, single‐layer superconductors, double‐layer superconductors, and infinite layer materials (e.g., CaCuO2, as in the Figure).

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Structural phase transformations and superconductivity inLa2−xBa

Cited by 661 publications

References 24 publications

Symmetry analysis for the Ruddlesden-Popper systems Ca3Mn2O7and Ca
Harris
¹

2011
Phys. Rev. B

Symmetry analysis for the Ruddlesden-Popper systems Ca3Mn2O7and Ca
Harris
¹

2011
Phys. Rev. B

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

et al. 2011
Phys. Rev. B
305
43
411
2
View full text Add to dashboard Cite

Crystal structures of Copper‐Based High‐T_c Superconductors

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Structural phase transformations and superconductivity inLa2−xBa

Cited by 661 publications

References 24 publications

Symmetry analysis for the Ruddlesden-Popper systems Ca3Mn2O7and CaHarris1 2011Phys. Rev. B

Symmetry analysis for the Ruddlesden-Popper systems Ca3Mn2O7and CaHarris1 2011Phys. Rev. B

Stripe order in superconducting La2−xBaxCuOHücker1, Zimmermann2, Gu3 et al. 2011Phys. Rev. B305434112View full textAdd to dashboardCite

Crystal structures of Copper‐Based High‐Tc Superconductors

Contact Info

Product

Resources

About

Symmetry analysis for the Ruddlesden-Popper systems Ca3Mn2O7and Ca
Harris
¹

2011
Phys. Rev. B

Symmetry analysis for the Ruddlesden-Popper systems Ca3Mn2O7and Ca
Harris
¹

2011
Phys. Rev. B

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

et al. 2011
Phys. Rev. B
305
43
411
2
View full text Add to dashboard Cite

Crystal structures of Copper‐Based High‐T_c Superconductors