Naslov
Transport Properties of High-Tc Ruthenocuprate RuSr2GdCu2O8

Autori
Herak, Mirta ; Bilušić, Ante ; Drobac, Đuro ; Smontara, Ana ; Berger, H.

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

Izvornik
Europhysics conference abstracts / Battistig, G. ; Hajdu, Cs. ; Nagy, D. L. ; Szilagyi, E. - Budimpešta : European Physical Society (EPS), 2002, 135-135

Skup
International Conference for Physics Students, Budimpešta

Mjesto i datum
Budimpešta, Mađarska, 26.08.2002. - 30.08.2002

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
rutenokuprati; visokotemperaturna-supravodljivost; antiferomagnet; toplinska vodljivost; termostruja; električna vodljivost; magnetska susceptibilnost
(ruthenocuprate; high-Tc superconductor; antiferomagnet; thermal conductivtiy; thermopower; electrical conductivity; magnetic susceptibility)

Sažetak
RuSr2GdCu2O8 is a member of the family of ruthenocuprates, relatively new members of the family of high-Tc superconductors. It was first synthesized in 1995 and since then it has caught a great deal of attention. The reason is the coexistence of both antiferromagnetic and superconducting order parameter in RuSr2GdCu2O8. This coexistence is unexpected because magnetic field destroys superconductivity. So far, it has been explained by the loose coupling of RuO2 planes (in which Ru moments order antiferromagneticaly) and CuO2 planes (in which are electrons who become superconducting). Measurements of electrical resistivity, thermopower, ac susceptibility and thermal conductivity have been performed. Electrical resistivity shows metal behavior at temperatures higher than Tc. The SC transition is wide and starts at 45 K when resistivity starts to fall rapidly with falling temperature. At Tc = 24 K resistivity falls to zero. Magnetic transition is also seen in resistivity and is confirmed by ac susceptibility measurement which shows magnetic transition at TM = 132 K which is attributed, by neutron scattering measurements, to antiferromagnetic transition of ruthenium moments. Thermopower is typical for underdoped high-Tc superconductors, also starts to fall at 45 K and falls to zero at 24 K. To our knowledge thermal conductivity measurements of this system have yet not been published anywhere and this is our main contribution. Thermal conductivity shows similar behavior as well known YBCO system. Main contribution is phononic. Electron contribution was calculated by the use of Wiedemann-Franz law and it gains only 3% of the total thermal conductivity. Magnetic transition seems not to influence heat conductivity which shows that phonon-phonon interaction is dominant.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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