Spin-density-wave state of chromium

Buker, Donald W.

doi:10.1103/physrevb.25.991

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…Despite the three equivalent < 001 > directions for a cubic lattice, Cr predominantly exhibits a single-Q IC-SDW state which spontaneously breaks the lattice symmetry. The multi-Q SDW (superposition of different Q) was predicted to be energetically unfavorable 24,25 . Therefore, different single-Q domains with orthogonal Q orientations will coexist 26,27 .…”

Section: Introductionmentioning

confidence: 99%

Revelation of new magnetic domain wall category in the itinerant antiferromagnet Chromium

Zhang,

Hu,

Wang

et al. 2024

Preprint

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Conventional magnetic domain walls are characterized by the reorientation of local moments. However, what occurs at the boundary of itinerant magnets is largely unknown. Here using spin-sensitive scanning tunneling microscopy, we investigated the microscopic boundaries of spin-density-wave (SDW) state in a prototypical itinerant anti-ferromagnet of Cr. We find at the boundary of two incommensurate SDW domains, the spins display finite-scale decay rather than reorientation. A novel double-Q SDW is generated with a second-order charge modulation. In commensurate SDW domains, a clear SDW gap is observed. Screw dislocations induced novel “half” vortex and anti-vortex that are connected by antiphase domain wall. This domain wall is characterized by vanishing spin density, where intriguing SDW in-gap states emerge, resembling the Andreev bound states in superconductors. All these unique SDW boundary structures can be viewed as consequences of local interference of two SDW, either with different Q or reversed phases. Therefore, our study revealed a new category of magnetic domain wall, the “interference wall”, with a mechanism rooted in itinerant nature.

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Section: Introductionmentioning

confidence: 99%

Revelation of new magnetic domain wall category in the itinerant antiferromagnet Chromium

Zhang,

Hu,

Wang

et al. 2024

Preprint

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“…However, despite several decades of intense theoretical work which led to the construction of a successful microscopic SDW model for cromium [2,[5][6][7][8][9][10][11][12], there is a surprising aspect of the AFM behavior in this material which escapes any microscopic understanding so far. It is the famous spinflip (SF) transition as a function of temperature for which there are only phenomenological accounts within a Landau framework [4,[13][14][15]. Spin-orbit coupling and dipoledipole interactions have been shown to be unable to produce a spin-flip transition with temperature [16].…”

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confidence: 99%

Universal Spin-Flip Transition in Itinerant Antiferromagnets

Varelogiannis

2003

Phys. Rev. Lett.

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We report a universal spin flip (SF) transition as a function of temperature in spin-density-wave (SDW) systems. At low temperatures the antiferromagnetic (AFM) polarization is parallel to the applied field and above a critical temperature the AFM polarization {\it flips} perpendicular to the field. This transition occurs in {\it any} SDW system and may be considered as a qualitative probe of the itinerant character of AFM in a given material. Our SF transition resolves the longstanding puzzle of the SF transition observed in cromium and may be at the origin of the equally puzzling SDW-I to SDW-II transition in Bechgaard salts for which we make experimental predictions

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