Properties of the divalent-Yb compound YbAu₂Si₂ under extreme conditions

详细信息    查看全文

• 作者：J. Ka&scaron ; til^a ; M. Mí ; &scaron ; ek^a ; J. Kamará ; d^a ; Z. Arnold^a ; K. Vlá ; &scaron ; ková ; ^b ; J. Prchal^b ; ^{prchal@karlov.mff.cuni.cz} ; M. Divi&scaron ; ^b ; P. Doležal^b ; J. Prokle&scaron ; ka^b ; J. Valenta^b ; J. Fiká ; ček^b ; A. Rudajevová ; ^b ; D. Kriegner^b
• 关键词：YbAu2Si2 ; Valence state ; High pressure ; Generalized gradient approximation
• 刊名：Physica B: Condensed Matter
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：505
• 期：Complete
• 页码：41-44
• 全文大小：574 K
• 卷排序：505

文摘

Polycrystalline YbAu2Si2 has been prepared by arc melting and a non-standard anisotropic thermal expansion is observed at low temperatures. A non-magnetic Yb2+ valence state is derived from magnetization, magnetic-susceptibility, heat-capacity and electrical-conductivity measurements in the temperature range from 0.3 to 300 K and at external pressures up to 3.2 GPa. By both experimental and theoretical investigations, YbAu2Si2 is confirmed to be a system with a weak electron-electron correlations and a small electron-phonon interaction. Application of hydrostatic pressure does not reveal any change of state in the range of applied pressures.