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Observations of the...
Observations of the effect of strong Pauli paramagnetism on the vortex lattice in superconducting CeCu2Si2
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- Campillo, E. (författare)
- Lund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,University of Birmingham
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- Riyat, R. (författare)
- University of Birmingham
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- Pollard, S. (författare)
- University of Birmingham
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- Jefferies, P. (författare)
- University of Birmingham
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- Holmes, A. T. (författare)
- European Spallation Source ESS ERIC
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- Cubitt, R. (författare)
- Institut Laue Langevin
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- White, J. S. (författare)
- Paul Scherrer Institute
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- Gavilano, J. (författare)
- Paul Scherrer Institute
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- Huesges, Z. (författare)
- Helmholtz Association of German Research Centers,Max Planck Institute for Chemical Physics of Solids
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- Stockert, O. (författare)
- Max Planck Institute for Chemical Physics of Solids
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- Forgan, E. M. (författare)
- University of Birmingham
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- Blackburn, E. (författare)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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(creator_code:org_t)
- 2021
- 2021
- Engelska.
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Ingår i: Physical Review B. - 2469-9950. ; 104:18
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- We present the results of a study of the vortex lattice in the heavy fermion superconductor CeCu2Si2, using small-angle neutron scattering (SANS). In this material at temperatures well below Tc∼0.6 K, the value of the upper critical field Bc2∼2.2 T is strongly limited by the Pauli paramagnetism of the heavy fermions. In this temperature region, our SANS data show an increase in the magnetization of the flux line cores with field, followed by a rapid fall near Bc2. This behavior is the effect of Pauli paramagnetism and we present a theory-based model, which can be used to describe this effect in a range of materials. The pairing in CeCu2Si2 appears to arise from the effect of magnetic fluctuations, but the evidence for a d-wave order parameter is rather weak. We find that the vortex lattice structure in CeCu2Si2 is close to regular hexagonal. There are no phase transitions to square or rhombic structures; such transitions are expected for d-wave superconductors and observed in CeCoIn5; however, the temperature dependence of the SANS intensity indicates that both large and small gap values are present, most likely due to multiband s-wave superconductivity, rather than a nodal gap structure.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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Campillo, E.
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Riyat, R.
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Pollard, S.
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Jefferies, P.
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Holmes, A. T.
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Cubitt, R.
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visa fler...
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White, J. S.
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Gavilano, J.
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Huesges, Z.
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Stockert, O.
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Forgan, E. M.
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Blackburn, E.
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Lunds universitet