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The transition from elastic to plastic deformation in a contact was observed as pop-in events on loading curves. The respective resolved shear stresses were computed for the octahedral slip systems <jats:inline-formula><jats:alternatives><jats:tex-math>$$\\langle{01}\\overline{1}\\rangle\\left\\{ {{111}} \\right\\}$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:mrow>\n                      <mml:mo>\u27e8<\/mml:mo>\n                      <mml:mn>01<\/mml:mn>\n                      <mml:mover>\n                        <mml:mn>1<\/mml:mn>\n                        <mml:mo>\u00af<\/mml:mo>\n                      <\/mml:mover>\n                      <mml:mo>\u27e9<\/mml:mo>\n                    <\/mml:mrow>\n                    <mml:mfenced>\n                      <mml:mn>111<\/mml:mn>\n                    <\/mml:mfenced>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>, supposing that their activation resulted in the onset of plasticity. A finite element analysis was applied, which reproduced the elastic loading until the first pop-in, using a realistic geometry of the Berkovich indenter blunt tip. The obtained estimate of the C<jats:sub>60<\/jats:sub> theoretical shear strength was about <jats:inline-formula><jats:alternatives><jats:tex-math>$${1}\/{11}$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:mn>1<\/mml:mn>\n                    <mml:mo>\/<\/mml:mo>\n                    <mml:mn>11<\/mml:mn>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> of the shear modulus on {111} planes.<\/jats:p>\n                <jats:p><jats:bold>Graphical abstract<\/jats:bold><\/jats:p>","DOI":"10.1007\/s10853-021-05991-2","type":"journal-article","created":{"date-parts":[[2021,3,22]],"date-time":"2021-03-22T16:04:06Z","timestamp":1616429046000},"page":"10905-10914","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Estimate of theoretical shear strength of C60 single crystal by nanoindentation"],"prefix":"10.1007","volume":"56","author":[{"given":"Sergey N.","family":"Dub","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cetin","family":"Haftaoglu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4253-1366","authenticated-orcid":false,"given":"Vitaliy M.","family":"Kindrachuk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,3,22]]},"reference":[{"issue":"7","key":"5991_CR1","doi-asserted-by":"crossref","first-page":"572","DOI":"10.1007\/BF01397292","volume":"37","author":"J Frenkel","year":"1926","unstructured":"Frenkel J (1926) Zur Theorie der Elastizit\u00e4tsgrenze und der Festigkeit kristallinischer K\u00f6rper. 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