Naslov
17O NMR Study of High-Tc Cuprate (CaLa)(BaLa)CuO

Autori
Cvitanić, Tonči ; Požek, Miroslav ; Keren, Amit ; Amit, Eran

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
18th ISMAR 2013/14th NMR Users Meeting : Book of Abstracts / - , 2013, 90-90

Skup
ISMAR (18 ; 2013) ; NMR Users Meeting (14 ; 2013)

Mjesto i datum
Rio de Janeiro, Brazil, 19.05.2013. - 24.05.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
High-Tc; NMR; CaLaBaLaCuO

Sažetak
We investigate the high temperature superconductor cuprate (CaxLa1-x)(Ba1.75-x La0.25+x)Cu3Oy(CLBLCO), with YBa2Cu3Oy like structure by 17O NMR. Measurements were made on underdoped and optimally doped powder samples from two families (x = 0.1 and 0.4). Maximum Tc varies by 30% with minimal structural changes between families. The spectrum differentiates two distinctive oxygen sites - planar and apical. Spin-lattice relaxation times on these two sites differ by more than an order of magnitude as oxygen in conductive plane relaxes much faster. NMR lines shift with respect to temperature occurs only on planar site, while the apical site shift is temperature independent. The temperature dependence of the planar oxygen Knight shift of underdoped and doped samples, shows opening of gap at temperatures high above Tc, (as previously indicated by magnetization measurements). Unlike YBCO, where optimally doped samples show no evidence of pseudogap forming, we observe opening of the gap even in optimally doped samples.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA