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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.25: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Quantum criticality in Sr₃Ru₂O₇ studied by measurements of the magnetocaloric effect — •Manuel Mchalwat¹, Yoshi Tokiwa¹, R.S. Perry^2,3, 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).