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Abstract
Single crystals of TmNiC2 were grown by the optical floating-zone technique and were investigated by x-ray diffraction (XRD), thermal expansion, electrical resistivity, specific heat, and magnetic susceptibility measurements. Single-crystal XRD reveals the formation of a commensurate charge density wave (CDW) characterized by a CDW modulation vector q2c = (0.5, 0.5, 0.5), which is accompanied by a symmetry change from the orthorhombic space group Amm2 to the monoclinic space group Cm, i.e., to a CDW superstructure which is isostructural with that of LuNiC2 . For all transport and thermodynamic properties, anomalies related to a second order-type thermodynamic CDW phase transition are observed at around TCDW = 375 K. The large specific heat anomaly at TCDW, deltaC = 6.2 J mol−1 K−1 , together with noticeable changes in entropy and enthalpy related to the CDW transition, suggests that this point group symmetry breaking CDW phase transition affects more significant parts of the Fermi surface as compared to the incommensurate CDW transition of, e.g., SmNiC2 with no change in point group symmetry. The results on the antiferromagnetic and paramagnetic state of TmNiC2 obtained by the above macroscopic techniques were complemented by microscopic studies via inelastic neutron scattering. A crystalline electric field modeling of macroscopic susceptibility and magnetic specific heat and entropy contributions as well as microscopic neutron scattering data, reveal crystal field eigenstates and eigenvalues with a ground-state doublet of the Tm-4f electrons, which is well separated by about 25 meV from exited states of the J = 6 ground-state multiplet.
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Authors (5)
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Maria Fritthum
- Institute of Solid State Physics, TU Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria
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Berthold Stöger Dr
- X-Ray Center, TU Wien, Getreidemarkt 9, A-1060 Wien, Austria
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Devashibhai T. Adroja
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon OX11 0QX, United Kingdom and Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, Auckland Park 2006, South Africa
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Herwig Michor
- Institute of Solid State Physics, TU Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria
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Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
PHYSICAL REVIEW B
no. 107,
ISSN: 2469-9950 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Roman M., Fritthum M., Stöger B., Adroja D. T., Michor H.: Charge density wave and crystalline electric field effects in TmNiC2// PHYSICAL REVIEW B -Vol. 107,iss. 12 (2023), s.1-13
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physrevb.107.125137
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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