Pretražite po imenu i prezimenu autora, mentora, urednika, prevoditelja

Napredna pretraga

Pregled bibliografske jedinice broj: 577880

NMR evidence for spin fluctuations in underdoped LaO1−xFxFeAs


Hammerath, Franziska; Grafe, Hans-Joachim; Lang, Guillaume; Paar, Dalibor; Jochen, Guenther Behr
NMR evidence for spin fluctuations in underdoped LaO1−xFxFeAs // Verhandlungen der Deutschen physikalischen Gesellschaft
Berlin, Njemačka, 2012. (predavanje, međunarodna recenzija, sažetak, znanstveni)


CROSBI ID: 577880 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
NMR evidence for spin fluctuations in underdoped LaO1−xFxFeAs

Autori
Hammerath, Franziska ; Grafe, Hans-Joachim ; Lang, Guillaume ; Paar, Dalibor ; Jochen, Guenther Behr

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

Skup
Verhandlungen der Deutschen physikalischen Gesellschaft

Mjesto i datum
Berlin, Njemačka, 25-30.03.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
75As; NMR; pnictides

Sažetak
We present 75As Nuclear Magnetic Resonance (NMR) measurements on the iron-based superconductor LaO1−xFxFeAs with 0 ≤ x ≤ 0.1, covering a broad range of the phase diagram from magnetically- ordered to optimally-doped superconducting samples. For underdoped samples (x=0.05, x=0.075) the 75As NMR spin-lattice relaxation rate (T1T)−1 shows a Curie-Weiss-like increase at intermediate temperatures, indicating the slowing down of spin fluctuations. However, a simple Curie-Weiss fit fails to describe (T1T)−1(T) above 250 K and the occurrence of a peak in (T1T)−1 slightly above Tc. Instead, the data can be well described by considering a BPP-model for fluctuating magnetic fields in combination with a doping-independent linear temperature dependence at high temperature. At optimal doping (x=0.1) spin fluctuations are suppressed and only the linear contribution to (T1T)−1 is left. This stands in contrast to other pnictides, such as Ba(Fe1−xCoxAs)2 and Ba(FeAs1−xPx)2. Our analysis is consistent with charge carrier localization in underdoped LaO1−xFxFeAs as seen by means of resistivity measurements.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekti:
119-1191458-1022 - Mikrovalna istraživanja novih materijala (Požek, Miroslav, MZOS ) ( POIROT)

Ustanove:
Prirodoslovno-matematički fakultet, Zagreb

Profili:

Avatar Url Dalibor Paar (autor)


Citiraj ovu publikaciju:

Hammerath, Franziska; Grafe, Hans-Joachim; Lang, Guillaume; Paar, Dalibor; Jochen, Guenther Behr
NMR evidence for spin fluctuations in underdoped LaO1−xFxFeAs // Verhandlungen der Deutschen physikalischen Gesellschaft
Berlin, Njemačka, 2012. (predavanje, međunarodna recenzija, sažetak, znanstveni)
Hammerath, F., Grafe, H., Lang, G., Paar, D. & Jochen, G. (2012) NMR evidence for spin fluctuations in underdoped LaO1−xFxFeAs. U: Verhandlungen der Deutschen physikalischen Gesellschaft.
@article{article, year = {2012}, keywords = {75As, NMR, pnictides}, title = {NMR evidence for spin fluctuations in underdoped LaO1−xFxFeAs}, keyword = {75As, NMR, pnictides}, publisherplace = {Berlin, Njema\v{c}ka} }
@article{article, year = {2012}, keywords = {75As, NMR, pnictides}, title = {NMR evidence for spin fluctuations in underdoped LaO1−xFxFeAs}, keyword = {75As, NMR, pnictides}, publisherplace = {Berlin, Njema\v{c}ka} }




Contrast
Increase Font
Decrease Font
Dyslexic Font