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  Highly sensitive band structure of the Stoner-enhanced Pauli paramagnet SrCo2P2

Götze, K., Kraft, I., Klotz, J., Förster, T., Uhlarz, M., Lorenz, V., et al. (2021). Highly sensitive band structure of the Stoner-enhanced Pauli paramagnet SrCo2P2. Physical Review B, 104(8): 085148, pp. 1-7. doi:10.1103/PhysRevB.104.085148.

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 Creators:
Götze, K.1, Author
Kraft, I.2, Author           
Klotz, J.1, Author
Förster, T.1, Author
Uhlarz, M.1, Author
Lorenz, V.2, Author           
Bergmann, C.3, Author           
Prots, Y.4, Author           
Bruin, J. A. N.1, Author
McCollam, A.1, Author
Sheikin, I.1, Author
Wosnitza, J.1, Author
Geibel, C.5, Author           
Rosner, H.2, Author           
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
4Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              
5Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: The compound SrCo2P2 is a Pauli paramagnet very close to ferromagnetic order. To study its electronic structure in close vicinity to the Fermi level, we report measurements of the de Haas-van Alphen effect in magnetic fields up to 35 T in combination with density-functional-theory band-structure calculations in different approximations. The resulting electronic band structure not only depends significantly on the choice of the functional, but also crucially on the exact values of the structural parameters that have been determined at low temperatures by synchrotron x-ray diffraction. We find the best correspondence between the measured and the calculated de Haas-van Alphen frequencies for the general gradient approximation functional and the structural parameters that were determined at 10 K. Although SrCo2P2 crystallizes in the uncollapsed tetragonal structure with a large P-P distance between the Co2P2 layers, we observe a rather three-dimensional Fermi-surface topology. We obtain a mass-enhancement factor of about 2 deduced from the ratio between experimental and calculated quasiparticle masses. The temperature dependence of the structural parameters leads to a significant reduction of the electronic density of states at the Fermi level and in comparison with the measured Sommerfeld coefficient to an overall mass renormalization in line with our experiment.

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Language(s): eng - English
 Dates: 2021-08-252021-08-25
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 104 (8) Sequence Number: 085148 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008