Enhancement of long-range magnetic order by magnetic field in superconducting<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:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Khaykovich, Boris; Lee, Y. S.; Erwin, R. W.; Lee, S.-H.; Wakimoto, Shuichi; Thomas, K. J.; Kastner, M. A.; Birgeneau, R. J.

doi:10.1103/physrevb.66.014528

Cited by 155 publications

(175 citation statements)

References 35 publications

Supporting

Mentioning

140

Contrasting

Order By: Relevance

“…Interestingly, the spin-spin correlation length for the induced signal is > 400Å, which is at least 20 times greater than the radius of a vortex core [224]. Very similar results have been obtained on oxygen-doped La 2 CuO 4 [227,228]. There is an obvious parallel with the charge-related "checkerboard" pattern observed at vortices in superconducting Bi 2 Sr 2 CaCu 2 O 8+δ by scanning tunneling microscopy [229].…”

Section: Magnetic Fieldsupporting

confidence: 69%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

View full text Add to dashboard Cite

Summary. Neutron scattering studies have provided important information about the momentum and energy dependence of magnetic excitations in cuprate superconductors. Of particular interest are the recent indications of a universal magnetic excitation spectrum in hole-doped cuprates. That starting point provides motivation for reviewing the antiferromagnetic state of the parent insulators, and the destruction of the ordered state by hole doping. The nature of spin correlations in stripeordered phases is discussed, followed by a description of the doping and temperature dependence of magnetic correlations in superconducting cuprates. After describing the impact on the magnetic correlations of perturbations such as an applied magnetic field or impurity substitution, a brief summary of work on electron-doped cuprates is given. The chapter concludes with a summary of experimental trends and a discussion of theoretical perspectives. IntroductionNeutron scattering has played a major role in characterizing the nature and strength of antiferromagnetic interactions and correlations in the cuprates. Following Anderson's observation [1] that La 2 CuO 4 , the parent compound of the first high-temperature superconductor, should be a correlated insulator, with moments of neighboring Cu 2+ ions anti-aligned due to the superexchange interaction, antiferromagnetic order was discovered in a neutron diffraction study of a polycrystalline sample [2]. When single-crystal samples became available, inelastic studies of the spin waves determined the strength of the superexchange, J, as well as weaker interactions, such as the coupling between CuO 2 layers. The existence of strong antiferromagnetic spin correlations above the Néel temperature, T N , has been demonstrated and explained. Over time, the quality of such characterizations has improved considerably with gradual evolution in the size and quality of samples and in experimental techniques.Of course, what we are really interested in understanding are the optimallydoped cuprate superconductors. It took much longer to get a clear picture of the magnetic excitations in these compounds, which should not be surprising

show abstract

Section: Magnetic Fieldsupporting

confidence: 69%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

View full text Add to dashboard Cite

show abstract

“…This state is characterized at low temperatures T by static local spin-density wave (SDW) order with an ordering wavevector Q near (π, π ), an order that is not present in the state above T c . This was first reported in elastic neutron scattering experiments [2] on La 2−x Sr x CuO 4 (LSCO), with a correlation length of several hundred Angstrom (Å), but has been confirmed in other underdoped cuprates as well [3][4][5][6]. An enhancement of incommensurate static order was observed on increasing the applied magnetic field up to 14 T [2].…”

mentioning

confidence: 59%

d-Wave superconductivity as a catalyst for antiferromagnetism in underdoped cuprates

et al. 2010

View full text Add to dashboard Cite

Abstract. In underdoped high-T c cuprates, d-wave superconductivity competes with antiferromagnetism. It has generally been accepted that suppressing superconductivity leads to the nucleation of spin-density wave (SDW) order with wavevector near (π, π). We show theoretically, for a d-wave superconductor in an applied magnetic field including disorder and electronic correlations, that the creation of SDW order is in fact not simply due to suppression of superconductivity, but rather due to a correlation-induced splitting of an electronic bound state arising from the sign change of the order parameter along quasiparticle trajectories. The induced SDW order is therefore a direct consequence of the d-wave symmetry. The formation of anti-phase domain walls proves to be crucial for explaining the heretofore puzzling temperature dependence of the induced magnetism as measured by neutron diffraction.A superconductor is characterized by a Bardeen-Cooper-Schrieffer (BCS) order parameter k (R), where R is the center-of-mass coordinate of a Cooper pair of electrons with momenta (k, −k). The bulk ground state of such a system is homogeneous, but a spatial perturbation that breaks pairs, e.g. a magnetic impurity, may cause the suppression of k (R) locally. What is revealed when superconductivity is suppressed is the electronic phase in the absence of k , a normal Fermi liquid. Thus the low-energy excitations near magnetic impurities and in the vortex 4 Author to whom any correspondence should be addressed. [9,10] detected magnetic ordering as a wedge-shaped extension of the 'spin glass' phase into the SC dome of the temperature versus doping phase diagram ( figure 1(a)). Lake et al [2] reported that an incommensurate magnetic order similar to the field-induced state was also observed in zero field. Although it also vanished at T c , the ordered magnetic moment in zero field had a T dependence, which was qualitatively different from the field-induced signal. The zero-field signal was attributed to disorder, but the relation between impurities and magnetic ordering remained unclear. Because strong magnetic fluctuations with similar wavevectors are reported at low but nonzero energies in inelastic neutron scattering experiments on these materials, e.g. on optimally doped LSCO samples exhibiting no spin-glass phase in zero field, it is frequently argued that impurities or vortices simply 'freeze' this fluctuating order [11].Describing such a phenomenon theoretically at the microscopic level is difficult due to the inhomogeneity of the interacting system, but it is important if one wishes to explore situations with strong disorder, where the correlations may no longer reflect the intrinsic spin dynamics of the pure system. Such an approach was proposed in a model calculation for an inhomogeneous d-wave superconductor with Hubbard-type correlations treated in the mean field [12]. In this model, a single impurity creates, at sufficiently large Hubbard interaction U and impurity potential strength V imp , a droplet of staggered magn...

show abstract

“…Similar results have been obtained for the related material La 2 CuO 4ϩy . 7 Nuclear magnetic resonance ͑NMR͒ experiments have shown evidence of antiferromagnetism in and around the vortex cores of nearoptimally doped Tl 2 Ba 2 CuO 6ϩ␦ . 8 15 This LDOS modulation observed at low energy, ͉ ͉ Ͻ12 meV, was found to have half the period of the spin density wave ͑SDW͒ observed by neutron scattering ͑i.e., four lattice constants 4a 0 ), and to be oriented along the crystal axes of the Cu-O plane.…”

Section: Checkerboard Local Density Of States In Striped Domains Pinnmentioning

confidence: 99%

Checkerboard local density of states in striped domains pinned by vortices

Andersen

Hedegård²,

Bruus³

2003

Phys. Rev. B

View full text Add to dashboard Cite

We discuss recent elastic neutron scattering and scanning tunneling experiments on High-Tc cuprates exposed to an applied magnetic field. Antiferromagnetic vortex cores operating as pinning centers for surrounding stripes is qualitatively consistent with the neutron data provided the stripes have the antiphase modulation. Within a Green's function formalism we study the low energy electronic structure around the vortices and find that besides the dispersive quantum interference there exists a non-dispersive checkerboard interference pattern consistent with recent scanning tunneling measurements. Thus both experiments can be explained from the physics of a single CuO2 plane.

show abstract

Enhancement of long-range magnetic order by magnetic field in superconductingLa2CuO4+y

Cited by 155 publications

References 35 publications

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

d-Wave superconductivity as a catalyst for antiferromagnetism in underdoped cuprates

Checkerboard local density of states in striped domains pinned by vortices

Contact Info

Product

Resources

About