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  Gradual pressure-induced enhancement of magnon excitations in CeCoSi

Nikitin, S. E., Franco, D. G., Kwon, J., Bewley, R., Podlesnyak, A., Hoser, A., et al. (2020). Gradual pressure-induced enhancement of magnon excitations in CeCoSi. Physical Review B, 101(21): 214426, pp. 1-11. doi:10.1103/PhysRevB.101.214426.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A4CD-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-AC59-5
Genre: Journal Article

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 Creators:
Nikitin, S. E.1, Author              
Franco, D. G.1, Author              
Kwon, J.2, Author              
Bewley, R.3, Author
Podlesnyak, A.3, Author
Hoser, A.3, Author
Koza, M. M.3, Author
Geibel, C.4, Author              
Stockert, O.2, Author              
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
3External Organizations, ou_persistent22              
4Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: CeCoSi is an intermetallic antiferromagnet with a very unusual temperature-pressure phase diagram: at ambient pressure it orders below T-N = 8.8 K, while application of hydrostatic pressure induces a new magnetically ordered phase with exceptionally high transition temperature of similar to 40 K at 1.5 GPa. We studied the magnetic properties and the pressure-induced magnetic phase of CeCoSi by means of elastic and inelastic neutron scattering (INS) and heat capacity measurements. At ambient pressure CeCoSi orders into a simple commensurate AFM structure with a reduced ordered moment of only m(Ce) = 0.37(6)mu(B). Specific heat and low-energy INS indicate a significant gap in the low-energy magnon excitation spectrum in the antiferromagnetic phase, with the CEF excitations located above 10 meV. Hydrostatic pressure gradually shifts the energy of the magnon band towards higher energies and the temperature dependence of the magnons measured at 1.5 GPa is consistent with the phase diagram. Moreover, the CEF excitations are also drastically modified under pressure.

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Language(s): eng - English
 Dates: 2020-06-172020-06-17
 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: 101 (21) Sequence Number: 214426 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008