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Wu, Weixing; Joynt, Robert

doi:10.1103/physrevb.65.104502

Cited by 30 publications

(41 citation statements)

References 19 publications

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“…A similar result was also obtained on the Ni-Cu-Co sample so that the observed exchange bias is not related to the AFM nature of the fcc Fe [25]. We here use fcc Fe simply because it provides a stronger interlayer coupling than the Cu spacer layer [26,27].…”

supporting

confidence: 72%

Symmetry-Breaking Induced Exchange Bias in Ferromagnetic Ni-Cu-Co and Ni-Fe-Co Sandwiches Grown on a Vicinal Cu(001) Surface

Won

Arenholz

et al. 2007

Phys. Rev. Lett.

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Ferromagnetic Ni-Cu-Co and Ni-Fe-Co sandwiches were grown epitaxially onto a vicinal Cu(001) substrate and investigated using magneto-optical Kerr effect and x-ray magnetic circular dichroism techniques. We find that the atomic steps of the vicinal surface break the magnetic reversal symmetry to induce an exchange bias in the Ni perpendicular magnetic hysteresis loop. The Ni exchange bias direction can be switched by changing the direction of the in-plane Co magnetization. In addition, the exchange bias can be tailored by changing the Cu or Fe spacer layer thickness.

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supporting

confidence: 72%

Symmetry-Breaking Induced Exchange Bias in Ferromagnetic Ni-Cu-Co and Ni-Fe-Co Sandwiches Grown on a Vicinal Cu(001) Surface

Won

Arenholz

et al. 2007

Phys. Rev. Lett.

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“…Alternatively, it could be a consequence of the presence of the CuO chains which, for strong chain-plane hybridization, can directly affect the CuO 2 -plane-derived electronic structure (Atkinson, 1999). Anyway it seems that for Y123, rather than a pure d x 2 −y 2 symmetry, alternative models should be considered (Atkinson, 1999;Wu, 2002).…”

Section: G Discussionmentioning

confidence: 99%

Angle-resolved photoemission studies of the cuprate superconductors

2003

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The last decade witnessed significant progress in angle-resolved photoemission spectroscopy (ARPES) and its applications. Today, ARPES experiments with 2 meV energy resolution and 0.2 • angular resolution are a reality even for photoemission on solid systems. These technological advances and the improved sample quality have enabled ARPES to emerge as a leading tool in the investigation of the high-Tc superconductors. This paper reviews the most recent ARPES results on the cuprate superconductors and their insulating parent and sister compounds, with the purpose of providing an updated summary of the extensive literature in this field. The low energy excitations are discussed with emphasis on some of the most relevant issues, such as the Fermi surface and remnant Fermi surface, the superconducting gap, the pseudogap and d-wave-like dispersion, evidence of electronic inhomogeneity and nano-scale phase separation, the emergence of coherent quasiparticles through the superconducting transition, and many-body effects in the one-particle spectral function due to the interaction of the charge with magnetic and/or lattice degrees of freedom. Given the dynamic nature of the field, we chose to focus mainly on reviewing the experimental data, as on the experimental side a general consensus has been reached whereas interpretations and related theoretical models can vary significantly. The first part of the paper introduces photoemission spectroscopy in the context of strongly interacting systems, along with an update on the state-of-the-art instrumentation. The second part provides a brief overview of the scientific issues relevant to the investigation of the low energy electronic structure by ARPES. The rest of the paper is devoted to the review of experimental results from the cuprates and the discussion is organized along conceptual lines: normal-state electronic structure, interlayer interaction, superconducting gap, coherent superconducting peak, pseudogap, electron self energy and collective modes. Within each topic, ARPES data from the various copper oxides are presented.

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“…4.1). The uniaxial thermal conductivity tensor in the unitary scattering limit for a spherical Fermi surface is explicitly given (Norman and Hirschfeld 1996, Kübert and Hirschfeld 1998, Machida et al 1999, Graf et al 2000, Wu and Joynt 2002 as…”

Section: Detection Of Superconducting Order Parameter Symmetrymentioning

confidence: 99%