The electronic characterization of the cubic Laves-phase superconductor CaRh2

Karolina Górnicka; Robert J. Cava; Tomasz Klimczuk

doi:10.1016/j.jallcom.2019.04.199

The electronic characterization of the cubic Laves-phase superconductor CaRh₂

Karolina Górnicka
, Robert J. Cava
, Tomasz Klimczuk

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

We present the synthesis and experimental characterization of the electronic properties of the cubic Laves phase superconductor CaRh₂. Its crystal structure was confirmed by powder X-ray diffraction and its ambient temperature lattice parameter (a = 7.5326(6) Å) is in good agreement with the literature. Magnetization, resistivity and heat-capacity measurements indicate that CaRh₂ is a moderate-coupling type-II superconductor (λ_e-p = 0.89) with a transition temperature T_c = 5.13 K. A sharp discontinuity at T_c in the heat capacity shows that the normalized specific-heat jump is ΔC/γT_c = 1.78, which exceeds the value predicted by weak-coupling BCS theory (1.43).

Original language	English
Pages (from-to)	393-399
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	793
DOIs	https://doi.org/10.1016/j.jallcom.2019.04.199
State	Published - Jul 15 2019
Externally published	Yes

Funding

The research performed at the Gdansk University of Technology was supported by the National Science Centre (Poland) grant ( UMO-2017/27/B/ST5/03044 ). The synthesis and thermodynamic characterization performed at Princeton was supported by the Department of Energy , Division of Basic Energy Sciences , grant DE-FG02-98ER45706 . The research performed at the Gdansk University of Technology was supported by the National Science Centre (Poland) grant (UMO-2017/27/B/ST5/03044). The synthesis and thermodynamic characterization performed at Princeton was supported by the Department of Energy, Division of Basic Energy Sciences, grant DE-FG02-98ER45706.

Keywords

Experimental characterization
Laves phase
Superconductivity
Synthesis

Access to Document

10.1016/j.jallcom.2019.04.199

Cite this

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title = "The electronic characterization of the cubic Laves-phase superconductor CaRh2",

abstract = "We present the synthesis and experimental characterization of the electronic properties of the cubic Laves phase superconductor CaRh2. Its crystal structure was confirmed by powder X-ray diffraction and its ambient temperature lattice parameter (a = 7.5326(6) {\AA}) is in good agreement with the literature. Magnetization, resistivity and heat-capacity measurements indicate that CaRh2 is a moderate-coupling type-II superconductor (λe-p = 0.89) with a transition temperature Tc = 5.13 K. A sharp discontinuity at Tc in the heat capacity shows that the normalized specific-heat jump is ΔC/γTc = 1.78, which exceeds the value predicted by weak-coupling BCS theory (1.43).",

keywords = "Experimental characterization, Laves phase, Superconductivity, Synthesis",

author = "Karolina G{\'o}rnicka and Cava, \{Robert J.\} and Tomasz Klimczuk",

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AU - Cava, Robert J.

AU - Klimczuk, Tomasz

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AB - We present the synthesis and experimental characterization of the electronic properties of the cubic Laves phase superconductor CaRh2. Its crystal structure was confirmed by powder X-ray diffraction and its ambient temperature lattice parameter (a = 7.5326(6) Å) is in good agreement with the literature. Magnetization, resistivity and heat-capacity measurements indicate that CaRh2 is a moderate-coupling type-II superconductor (λe-p = 0.89) with a transition temperature Tc = 5.13 K. A sharp discontinuity at Tc in the heat capacity shows that the normalized specific-heat jump is ΔC/γTc = 1.78, which exceeds the value predicted by weak-coupling BCS theory (1.43).

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KW - Laves phase

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