Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 28: Correlated Electrons: Low-dimensional Systems - Materials 2
TT 28.11: Vortrag
Mittwoch, 28. März 2012, 17:45–18:00, H 0104
Field-induced length changes in the spin-liquid candidate κ-(ET)2Cu2(CN)3 — •Rudra Sekhar Manna1, Mariano de Souza1,3, John A. Schlueter2, and Michael Lang1 — 1Physikalisches Institut, Goethe-University Frankfurt (M), SFB/TR 49, D-60438 Frankfurt (M), Germany — 2Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA — 3Present address: Departamento de Fisica, Unesp - Universidade Estadual Paulista, CEP 13500-970, Rio Claro (SP), Brazil
Thermal expansion measurements on the spin-liquid compound κ-(ET)2Cu2(CN)3 show a pronounced and strongly anisotropic anomaly at 6 K, a clear signature of a second-order phase transition [1]. In order to study the effect of a magnetic field on the low-temperature spin-liquid state [2], dilatometric measurements under magnetic field have been performed. Interestingly, we find that besides the 6 K anomaly, which is insensitive to magnetic fields B ≤ 10 T, the maximum field applied, field-induced anomalies show up for fields aligned along the crystallographic b-axis. The effects become particularly clear in measurements of the magnetostriction where two step-like anomalies were observed. One of these anomalies lies close to the phase boundary between quantum critical (QCH) and weak antiferromagnetic (WAFH) phases derived from µSR measurements [2].
R. S. Manna et al., PRL 104, 016403 (2010).
F. L. Pratt et al., Nature 471, 612 (2011).