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Simple metal under tensile stress: layer-dependent herringbone reconstruction of thin potassium films on graphite

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Simple metal under tensile stress : layer-dependent herringbone reconstruction of thin potassium films on graphite. / Yin, Feng; Kulju, Sampo; Koskinen, Pekka; Akola, Jaakko; Palmer, Richard E.

In: Scientific Reports, Vol. 5, 10165, 11.05.2015.

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Yin, Feng ; Kulju, Sampo ; Koskinen, Pekka ; Akola, Jaakko ; Palmer, Richard E. / Simple metal under tensile stress : layer-dependent herringbone reconstruction of thin potassium films on graphite. In: Scientific Reports. 2015 ; Vol. 5.

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@article{cc22192c06514cd9b9ea739509e8af1f,
title = "Simple metal under tensile stress: layer-dependent herringbone reconstruction of thin potassium films on graphite",
abstract = "While understanding the properties of materials under stress is fundamentally important, designing experiments to probe the effects of large tensile stress is difficult. Here tensile stress is created in thin films of potassium (up to 4 atomic layers) by epitaxial growth on a rigid support, graphite. We find that this {"}simple{"} metal shows a long-range, periodic {"}herringbone{"} reconstruction, observed in 2- and 3- (but not 1- and 4-) layer films by low-temperature scanning tunneling microscopy (STM). Such a pattern has never been observed in a simple metal. Density functional theory (DFT) simulations indicate that the reconstruction consists of self-aligned stripes of enhanced atom density formed to relieve the tensile strain. At the same time marked layer-dependent charging effects lead to substantial variation in the apparent STM layer heights.",
keywords = "SUBMONOLAYER POTASSIUM, ELECTRONIC-STRUCTURE, PHASE-TRANSITIONS, POST-PEROVSKITE, HIGH-PRESSURE, GRAPHENE, CLUSTERS, SURFACE, NANOSCALE, PHYSICS",
author = "Feng Yin and Sampo Kulju and Pekka Koskinen and Jaakko Akola and Palmer, {Richard E.}",
note = "EXT={"}Koskinen, Pekka{"}",
year = "2015",
month = "5",
day = "11",
doi = "10.1038/srep10165",
language = "English",
volume = "5",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",

}

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TY - JOUR

T1 - Simple metal under tensile stress

T2 - layer-dependent herringbone reconstruction of thin potassium films on graphite

AU - Yin, Feng

AU - Kulju, Sampo

AU - Koskinen, Pekka

AU - Akola, Jaakko

AU - Palmer, Richard E.

N1 - EXT="Koskinen, Pekka"

PY - 2015/5/11

Y1 - 2015/5/11

N2 - While understanding the properties of materials under stress is fundamentally important, designing experiments to probe the effects of large tensile stress is difficult. Here tensile stress is created in thin films of potassium (up to 4 atomic layers) by epitaxial growth on a rigid support, graphite. We find that this "simple" metal shows a long-range, periodic "herringbone" reconstruction, observed in 2- and 3- (but not 1- and 4-) layer films by low-temperature scanning tunneling microscopy (STM). Such a pattern has never been observed in a simple metal. Density functional theory (DFT) simulations indicate that the reconstruction consists of self-aligned stripes of enhanced atom density formed to relieve the tensile strain. At the same time marked layer-dependent charging effects lead to substantial variation in the apparent STM layer heights.

AB - While understanding the properties of materials under stress is fundamentally important, designing experiments to probe the effects of large tensile stress is difficult. Here tensile stress is created in thin films of potassium (up to 4 atomic layers) by epitaxial growth on a rigid support, graphite. We find that this "simple" metal shows a long-range, periodic "herringbone" reconstruction, observed in 2- and 3- (but not 1- and 4-) layer films by low-temperature scanning tunneling microscopy (STM). Such a pattern has never been observed in a simple metal. Density functional theory (DFT) simulations indicate that the reconstruction consists of self-aligned stripes of enhanced atom density formed to relieve the tensile strain. At the same time marked layer-dependent charging effects lead to substantial variation in the apparent STM layer heights.

KW - SUBMONOLAYER POTASSIUM

KW - ELECTRONIC-STRUCTURE

KW - PHASE-TRANSITIONS

KW - POST-PEROVSKITE

KW - HIGH-PRESSURE

KW - GRAPHENE

KW - CLUSTERS

KW - SURFACE

KW - NANOSCALE

KW - PHYSICS

U2 - 10.1038/srep10165

DO - 10.1038/srep10165

M3 - Article

VL - 5

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 10165

ER -