Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.25: Poster
Donnerstag, 17. März 2011, 10:00–13:00, P1
Quantum criticality in Sr3Ru2O7 studied by measurements of the magnetocaloric effect — •Manuel Mchalwat1, Yoshi Tokiwa1, R.S. Perry2,3, Y. Maeno3, and Philipp Gegenwart1 — 1I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen — 2Scottish Universities Physics Alliance, School of Physics, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, Scotland — 3International Innovation Center and Department of Physics, Kyoto University, Kyoto 606-8501, Japan
The tetragonal ruthenate Sr3Ru2O7 displays itinerant electron metamagnetism and the formation of a novel phase close to a presumed quantum critical point (QCP). Here, we address quantum criticality by measurements of the adiabatic magnetocaloric effect, determined using an alternating field method. Our results indicate universal scaling behavior over several decades in temperature over magnetic field in agreement with the predictions of the Hertz-Millis scenario for an itinerant two-dimensional metamagnetic (z=3) QCP.
Work supported by the DFG through SFB 602 and research unit 960 (Quantum phase transitions).