• Sun, Yuping
• Wang, Zhen
• Petrovic, Cedomir
• Liu, Yu
• Bozin, Emil S.
• Warren, John B.
• Dooryhee, Eric
• Billinge, Simon J. L.
• Deng, Xiaoyu
• Li, Lijun
• Huang, Yanan
• Tomic, Aleksandra
• Abeykoon, Milinda
• Kotliar, Gabriel
• Zhu, Yimei

Abstract

<jats:title>Abstract</jats:title><jats:p>We report on the emergence of robust superconducting order in single crystal alloys of TaSe<jats:sub>2<jats:bold>−</jats:bold><jats:italic>x</jats:italic></jats:sub>S<jats:sub><jats:italic>x</jats:italic></jats:sub> (0 ≤ × ≤ 2). The critical temperature of the alloy is surprisingly higher than that of the two end compounds TaSe<jats:sub>2</jats:sub> and TaS<jats:sub>2</jats:sub>. The evolution of superconducting critical temperature <jats:italic>T</jats:italic><jats:sub>c</jats:sub>(<jats:italic>x</jats:italic>) correlates with the full width at half maximum of the Bragg peaks and with the linear term of the high-temperature resistivity. The conductivity of the crystals near the middle of the alloy series is higher or similar than that of either one of the end members 2H-TaSe<jats:sub>2</jats:sub> and/or 2H-TaS<jats:sub>2</jats:sub>. It is known that in these materials superconductivity is in close competition with charge density wave order. We interpret our experimental findings in a picture where disorder tilts this balance in favor of superconductivity by destroying the charge density wave order.</jats:p>

Topics

• density
• impedance spectroscopy
• compound
• single crystal
• resistivity
• superconductivity
• superconductivity
• critical temperature