Crystal truncation rods from miscut surfaces

Petach, Trevor A.; Mehta, Apurva; Toney, Michael F.; Goldhaber-Gordon, David

doi:10.1103/PhysRevB.95.184104

Title: Crystal truncation rods from miscut surfaces

Journal Article · Mon May 08 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.184104· OSTI ID:1368755

Petach, Trevor A. ^[1]; Mehta, Apurva ^[2]; Toney, Michael F. ^[2]; Goldhaber-Gordon, David ^[1]

Stanford Univ., Palo Alto, CA (United States); The Stanford Institute for Materials and Energy Sciences (SIMES), SLAC National Accelerator Lab., and Stanford Univ., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

Crystal truncation rods are used to study surface and interface structure. Since real surfaces are always somewhat miscut from a low index plane, it is important to study the effect of miscuts on crystal truncation rods. We develop a model that describes the truncation rod scattering from miscut surfaces that have steps and terraces. We show that nonuniform terrace widths and jagged step edges are both forms of roughness that decrease the intensity of the rods. Nonuniform terrace widths also result in a broad peak that overlaps the rods. We use our model to characterize the terrace width distribution and step edge jaggedness on three SrTiO₃ (001) samples, showing excellent agreement between the model and the data, confirmed by atomic force micrographs of the surface morphology. As a result, we expect our description of terrace roughness will apply to many surfaces, even those without obvious terracing.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515; ECCS-1542152

OSTI ID:: 1368755

Alternate ID(s):: OSTI ID: 1355956

Journal Information:: Physical Review B, Vol. 95, Issue 18; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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