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Structure and magne...
Structure and magnetism of cobalt at high pressure and low temperature
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- Torchio, R. (författare)
- ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France.;CEA, DAM, DIF, F-91297 Arpajon, France.
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- Marini, C. (författare)
- ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France.;CELLS, ALBA Synchrotron, E-08290 Cerdanyola Del Valles, Spain.
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- Kvashnin, Yaroslav O. (författare)
- Uppsala universitet,Materialteori,ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France
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- Kantor, I. (författare)
- ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France.
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- Mathon, O. (författare)
- ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France.
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- Garbarino, G. (författare)
- ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France.
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- Meneghini, C. (författare)
- Univ ROMA TRE, Dipartimento Sci, Via Vasca Navale 84, Rome, Italy.
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- Anzellini, S. (författare)
- CEA, DAM, DIF, F-91297 Arpajon, France.;Diamond Light Source Ltd, Diamond House,Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England.
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- Occelli, F. (författare)
- CEA, DAM, DIF, F-91297 Arpajon, France.
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- Bruno, P. (författare)
- ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France.
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- Dewaele, A. (författare)
- CEA, DAM, DIF, F-91297 Arpajon, France.
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- Pascarelli, S. (författare)
- ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France.
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ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France;CEA, DAM, DIF, F-91297 Arpajon, France. ESRF European Synchrotron, 71 Ave Martyrs, Grenoble, France.;CELLS, ALBA Synchrotron, E-08290 Cerdanyola Del Valles, Spain. (creator_code:org_t)
- 2016
- 2016
- Engelska.
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Ingår i: PHYSICAL REVIEW B. - 2469-9950. ; 94:2
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The magnetic and structural properties of cobalt were investigated under high pressure (160 GPa) and low temperature (50 K), by synchrotron K-edge x-ray magnetic circular dichroism and x-ray diffraction. A quasihydrostatic equation of state was measured up to 160 GPa. We found that uniaxial stress plays a role in the hexagonal close packed-face centered cubic (hcp-fcc) structural transition pressure. Also, our data provide the first experimental evidence that changes of the c/a ratio pressure derivative are related to the magnetic behavior. The complete extinction of ferromagnetism is observed above 130 GPa in a mixed hcp-fcc phase with no recovery upon cooling to 50 K, indicating that cobalt at 150 GPa is very likely nonmagnetic, i.e., characterized by zero local spin polarization. Density functional theory calculations point out that the K-edge x-ray magnetic circular dichroism (XMCD) signal is related to the 4p orbital moment rather than to the total spin moment and allow us to get a deeper insight into the K-edge XMCD measurements interpretation. The combination of novel theoretical results and experimental outputs provides a detailed scenario of the structural and magnetic properties of cobalt at these extreme conditions answering some previously unsolved issues.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Torchio, R.
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Marini, C.
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Kvashnin, Yarosl ...
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Kantor, I.
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Mathon, O.
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Garbarino, G.
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Meneghini, C.
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Anzellini, S.
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Occelli, F.
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Bruno, P.
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Dewaele, A.
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Pascarelli, S.
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PHYSICAL REVIEW ...
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Uppsala universitet