Absence of superconductivity in LiPdHx. Issue 7 (3rd March 2018)

• Record Type: Journal Article
• Authors: Liu, Wenhao; Wang, Enyu; Chen, Guanyu; Zhu, Xiyu; Zhang, Yue; Sheng, Yuzong; Wen, Hai-Hu
• Is Part Of: Philosophical magazine. Volume 98:Issue 7(2018)
• Page Start: 623
• Page End: 631
• Publication Date: 2018-03-03
• Subjects: LiPdH -- high pressure -- specific heat -- hydrogen -- superconductivity; Condensed matter -- Periodicals; Physics -- Periodicals; Matière condensée -- Périodiques; Physique -- Périodiques; 530.41
• DOI: 10.1080/14786435.2017.1411624
• Languages: English
• ISSNs: 1478-6435

Abstract

Abstract: Theoretical calculations about LiPdH predict that it may be a superconductor. Using the high-pressure synthesis technique up to 3 GPa, we have successfully fabricated the LiPdH compound. The sample looks quite pure judging from the refinement of the X-ray diffraction pattern. However, no superconductivity has been detected down to about 2 K. The specific heat measurement shows a small Sommerfeld constant = 1.22 mJ mol K, which is a bit smaller than the theoretically predicted value. The magnetic susceptibility measured at 1 Tesla reveals a Curie–Weiss law behaviour in the low-temperature region with an estimate of the magnetic moment of 0.08 /Pd. The temperature dependence of resistivity has also been measured up to 25.2 GPa, but superconductivity is still not observed above 2 K. The large residual resistivity and small residual-resistivity ratio suggest that the quasiparticle scattering by impurities is quite strong, which might be induced by the hydrogen deficiency, and intimately hinders the occurrence of superconductivity in LiPdH .