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Synthesis and thermodynamic properties of superconducting NdPd1-δBi2 (δ∼0.23) single crystals.

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Title: Synthesis and thermodynamic properties of superconducting NdPd1-δBi2 (δ∼0.23) single crystals.
Authors: Zhang, F.M.1,2, Zhou, W.1,2 wei.zhou@cslg.edu.cn, Xu, C.Q.2, Liu, S.W.2, Zhang, J.Y.2, Xia, M.2, Xu, Xiaofeng2, Qian, B.1,2 njqb@cslg.edu.cn
Source: Journal of Alloys & Compounds. Apr2019, Vol. 782, p170-175. 6p.
Subjects: Electron synchrotrons, Electron counters, Photon-electron interactions, Electron-phonon interactions, Leptons (Nuclear physics)
Abstract: Abstract The interesting phenomena induced by the interaction between local moments and itinerant electrons in 4 f compounds have attracted extensive attention for many years. Here, we report the synthesis of a new 4 f compound, i.e. NdPd 1- δ Bi 2 (δ ∼0.23) which is superconducting with a transition temperature T c around 3.2 K. A comprehensive investigation of the thermodynamic properties suggests NdPd 1- δ Bi 2 is also an anti-ferromagnet with the Néel temperature T N ∼4 K. Moreover, its high-temperature paramagnetic state is characterized by an enhanced heat capacity with a Sommerfeld coefficient γ over 300 mJ mol−1 K−2, which presumably results from Nd3+ crystal-electric-field splitting rather than the Kondo effect. In the superconducting state, the suppression of superconductivity with field increasing for H || c is faster in comparison with H || ab , resulting in a moderate upper critical field anisotropy with Γ = H c 2 (0 K , ‖ a b) / H c 2 (0 K , ‖ c) ∼2.6. Collectively, NdPd 1- δ Bi 2 may serve as an intriguing system to study the interplay among magnetic order, Kondo effect, and superconductivity in 4 f compounds. Highlights • A new superconducting 4 f compound with T c ∼3.2 K is discovered. • Coexistence of superconductivity and antiferromagnetic order is observed. • The Sommerfeld coefficient γ value is over 300 mJ mol−1 K−2. • The upper critical fields exceed the Pauli limit. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Abstract The interesting phenomena induced by the interaction between local moments and itinerant electrons in 4 f compounds have attracted extensive attention for many years. Here, we report the synthesis of a new 4 f compound, i.e. NdPd 1- δ Bi 2 (δ ∼0.23) which is superconducting with a transition temperature T c around 3.2 K. A comprehensive investigation of the thermodynamic properties suggests NdPd 1- δ Bi 2 is also an anti-ferromagnet with the Néel temperature T N ∼4 K. Moreover, its high-temperature paramagnetic state is characterized by an enhanced heat capacity with a Sommerfeld coefficient γ over 300 mJ mol−1 K−2, which presumably results from Nd3+ crystal-electric-field splitting rather than the Kondo effect. In the superconducting state, the suppression of superconductivity with field increasing for H || c is faster in comparison with H || ab , resulting in a moderate upper critical field anisotropy with Γ = H c 2 (0 K , ‖ a b) / H c 2 (0 K , ‖ c) ∼2.6. Collectively, NdPd 1- δ Bi 2 may serve as an intriguing system to study the interplay among magnetic order, Kondo effect, and superconductivity in 4 f compounds. Highlights • A new superconducting 4 f compound with T c ∼3.2 K is discovered. • Coexistence of superconductivity and antiferromagnetic order is observed. • The Sommerfeld coefficient γ value is over 300 mJ mol−1 K−2. • The upper critical fields exceed the Pauli limit. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2018.12.076