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  Observation of two critical points linked to the high-field phase B in CeCu2Si2

Weickert, F., Gegenwart, P., Geibel, C., Assmus, W., & Steglich, F. (2018). Observation of two critical points linked to the high-field phase B in CeCu2Si2. Physical Review B, 98(8): 085115, pp. 1-5. doi:10.1103/PhysRevB.98.085115.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-F77B-F Version Permalink: http://hdl.handle.net/21.11116/0000-0001-F781-6
Genre: Journal Article

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Weickert, Franziska1, Author
Gegenwart, Philipp2, Author              
Geibel, Christoph1, Author
Assmus, Wolf1, Author
Steglich, Frank1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: We present thermal expansion and magnetostriction measurements on a CeCu2Si2 single crystal of A/S type up to 17.9 T magnetic field applied along the crystallographic a direction (Delta L parallel to a parallel to H) and down to 0.015 K temperature. We identify clear thermodynamic anomalies at the superconducting transition T-c and at two second-order transitions T-A,T-B into ordered phases A and B. Our measurements establish the boundary of phase B at high field and low temperature. No evidence for additional high-field phases above B is found up to the maximum field. We speculate based on our experimental results that (i) phase B is similar to phase A of spin-density wave type and (ii) the first-order phase transition between A and B is caused by Fermi-surface reconstruction. We furthermore identify a quantum critical point at H-c similar or equal to 17 T, where T-B is suppresssed to zero, and a bicritical point at (0.35 K, 7.0 T), where phase lines T-A(H) and T-B(H) meet.

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Language(s): eng - English
 Dates: 2018-08-082018-08-08
 Publication Status: Published in print
 Pages: -
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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: 98 (8) Sequence Number: 085115 Start / End Page: 1 - 5 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008