Naslov
Distinctive Behavior of Superconducting Fluctuations and Pseudogap in Nearly Optimally Doped Single Crystal of HgBa2CuO4+delta

Autori
Grbić, Mihael Srđan ; Barišić, Neven ; Dulčić, Antonije ; Kupčić, Ivan ; Li, Yuan ; Zhao, Xudong ; Yu, Guichuan ; Dressel, Martin ; Greven, Martin ; Požek, Miroslav

Izvornik
Physica. C, Superconductivity (0921-4534) 470 (2010), S1; S228-S229

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

Ključne riječi
superconductivity; microwave; fluctuations; pseudogap

Sažetak
We have applied an unconventional microwave measurement approach to a nearly optimally doped HgBa2CuO4+delta single crystal. The sample geometry assured the total lateral penetration of microwaves due to weak c-axis screening currents. With this cofiguration, one can achieve excellent sensitivity to small changes in conductivity. The data show that the pseudogap opens at T* = 185(15) K, which is almost twice the superconducting critical temperature Tc = 94.3 K. In contrast, the superconducting fluctuation regime is clearly confined to a narrow temperature range Tc < T < T'= 105(2) K, far below T*. This is confirmed by the magnetic-field dependence of the microwave absorption. Hence, our results support the distinction between the physical processes of pseudogap and the superconducting ordering.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad je prezentiran na skupu: 9th International Conference on Materials and Mechanisms of Superconductivity ; održanom od 07.-12.09.2009., Tokii, Japan. ; objavljen u Knjizi sažetaka / Masao Ogata (ur.) ; Tokyo : ICS Convention Design, Inc. , 2009. ; PS-A-31.

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