Naslov
Demonstrating the model nature of the high-temperature superconductor HgBa2CuO4+delta

Autori
Barišić, Neven ; Li, Yuan ; Zhao, Xudong ; Cho, Yong-Chan ; Chabot-Couture, Guillaume ; Yu, Guichuan ; Greven, Martin

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 78 (2008), 5; 054518-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
71.10.Hf; 71.30.+H; 72.80.Ga

Sažetak
The compound HgBa2CuO4+δ (Hg1201) exhibits a simple tetragonal crystal structure and the highest superconducting transition temperature (Tc) among all single Cu-O layer cuprates, with Tc = 97 K (onset) at optimal doping. Due to a lack of sizable single crystals, experimental work on this very attractive system has been significantly limited. Thanks to a recent breakthrough in crystal growth, such crystals have now become available.[1] Here, we demonstrate that it is possible to identify suitable heat treatment conditions to systematically and uniformly tune the hole concentration of Hg1201 crystals over a wide range, from very underdoped (Tc = 47 K, hole concentration p ~ 0.08) to overdoped (Tc = 64 K, p ~ 0.22). We then present quantitative magnetic susceptibility and DC charge transport results that reveal the very high-quality nature of the studied crystals. Using XPS on cleaved samples, we furthermore demonstrate that it is possible to obtain large surfaces of good quality. These characterization measurements demonstrate that Hg1201 should be viewed as a model hightemperature superconductor, and they provide the foundation for extensive future experimental work.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA