DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.42: Poster

Wednesday, March 13, 2013, 15:00–19:00, Poster D

Pulsed-field experiments on the quasi-2d antiferromagnet Cs2CuBr4 — •Lars Postulka, Bernd Wolf, Pham Thanh Cong, Natalia van Well, Franz Ritter, Wolf Assmus, and Michael Lang — PhysikalischesInstitut, Goethe-Universität Frankfurt (M), SFB/TR 49, D-60438Frankfurt (M), Germany

We present pulsed-field measurements up to 50 T of the longitudinal elastic constant c11 for 1.5 K < T < 4.2 K on single crystalline samples of Cs2CuBr4, aiming at identifying the signatures of the proposed spin liquid in the material’s elastic properties. A large softening, caused by the coupling of the quasi-2d spin fluctuations to the phonon system, is observed for magnetic fields smaller than the critical field Bc 31 T (B//a), an effect which is more pronounced for lower temperatures. As expected, in the fully-polarized state the c11 mode is field independent for all temperatures. We compare the magnetoelastic properties of Cs2CuBr4 with those of Cs2CuCl4 which is less frustrated and according to neutron scattering data can be characterized as a spin liquid. In the latter material the quantum-critical point is located at Bc = 8.5 T (B//a). In addition, we present a set-up for high precision-magnetization measurements in pulsed fields. The results of the experiments on Cs2CuBr4 will be discussed in connection with the ultrasonic data.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2013 > Regensburg