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Title: Face Centered Cubic and Hexagonal Close Packed Skyrmion Crystals in Centrosymmetric Magnets

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1420368
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 7; Related Information: CHORUS Timestamp: 2018-02-13 16:30:41; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Lin, Shi-Zeng, and Batista, Cristian D. Face Centered Cubic and Hexagonal Close Packed Skyrmion Crystals in Centrosymmetric Magnets. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.077202.
Lin, Shi-Zeng, & Batista, Cristian D. Face Centered Cubic and Hexagonal Close Packed Skyrmion Crystals in Centrosymmetric Magnets. United States. doi:10.1103/PhysRevLett.120.077202.
Lin, Shi-Zeng, and Batista, Cristian D. 2018. "Face Centered Cubic and Hexagonal Close Packed Skyrmion Crystals in Centrosymmetric Magnets". United States. doi:10.1103/PhysRevLett.120.077202.
@article{osti_1420368,
title = {Face Centered Cubic and Hexagonal Close Packed Skyrmion Crystals in Centrosymmetric Magnets},
author = {Lin, Shi-Zeng and Batista, Cristian D.},
abstractNote = {},
doi = {10.1103/PhysRevLett.120.077202},
journal = {Physical Review Letters},
number = 7,
volume = 120,
place = {United States},
year = 2018,
month = 2
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on February 13, 2019
Publisher's Accepted Manuscript

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  • Polarization-dependent extended x-ray absorption fine structure (PD-EXAFS) measurements have been made on a single-crystal 1000-A-thick Co film deposited on (100) diamond. By comparing the EXAFS signals corresponding to the in-plane and out-of-plane structure relative to the film plane, we clearly determine that the film does establish the face centered cubic (fcc) phase. Distinguishing between the hcp and fcc phases can thus be performed by qualitatively noting the polarization dependence of the Fourier transform peak amplitudes corresponding to the third and fourth coordination shells. This EXAFS study shows that the Co film studied here is unambiguously in the fcc phase. Themore » Fourier transform peaks corresponding to the first nearest neighbors, parallel and perpendicular to the film, have been compared. Results indicate less than a 0.0075 A difference between in-plane and out-of-plane bondlengths, no significant change in coordination number and less than a 0.001 A{sup 2} difference in EXAFS Debye{endash}Waller factors. All of these results indicate no tetragonal distortion of the fcc Co crystal lattice. This technique should prove valuable in future studies when trying to determine the crystallinity of thin films. {copyright} {ital 1996 American Vacuum Society}« less
  • The hard-sphere radial distribution functions, {ital g}{sub HS}({ital r}/{ital d},{eta}), for the face-centered cubic and hexagonal close-packed phases have been computed by the Monte Carlo method at nine values of the packing fraction, {eta}(=({pi}/6){rho}{ital d}{sup 3}), ranging from 4% below the melting density to 99% of the close-packed density. The Monte Carlo data are used to improve available analytic expressions for {ital g}{sub HS}({ital r}/{ital d},{eta}). By utilizing the new {ital g}{sub HS}({ital r}/{ital d},{eta}) in the Henderson and Grundke method (J. Chem. Phys. {bold 63}, 601 (1975)), we next derive an expression for {ital y}{sub HS}({ital r}/{ital d},{eta}) (={italmore » g}{sub HS}({ital r}/{ital d})exp{l brace}{beta}{ital V}{sub HS}({ital r}){r brace}) inside the hard-sphere diameter, {ital d}. These expressions are employed in a solid-state perturbation theory (J. Chem. Phys. {bold 84}, 4547 (1986)) to compute solid-state and melting properties of the Lennard-Jones and inverse-power potentials. Results are in close agreement with Monte Carlo and lattice-dynamics calculations performed in this and previous work. The new {ital g}{sub HS}({ital r}/{ital d},{eta}) shows a reasonable thermodynamic consistency as required by the Ornstein--Zernike relation. As an application, we have constructed a high-pressure phase diagram for a truncated Lennard-Jones potential. From this study, we conclude that the new {ital g}{sub HS}({ital r}/{ital d},{eta}) is an improvement over available expressions and that it is useful for solid-state calculations.« less
  • Nanoindentation tests were performed on single crystals of Mo and Ni. The critical shear stress for the first pop-in was {approx}1/7 of the shear modulus in both crystals. The dependence of pop-in probability on load was understood in terms of a thermally activated dislocation nucleation process. Comparison of the activation energies suggests nucleation of full dislocations in Mo and partial dislocations in Ni. The activation energy analysis also offers information on the specific slip system on which dislocations are nucleated.
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