Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Electrons - Poster Session
TT 79.12: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P2
Magnetostriction and thermal expansion of the triple-layered Sr4Ru3O10 System — •W. Schottenhamel1, R. Fittipaldi2, A. Vecchione2, A.U.B. Wolter1, and B. Büchner1 — 1Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01171 Dresden, Germany — 2Univ. Salerno, Dipartimento Fis ER Caianiello, I-84084 Fisciano, Italy
Sr4Ru3O10 is a member of the (Sr,Ca)n+1RunO3n+1 Ruddlesden Popper series and displays spontaneous ferromagnetism at Tc ∼ 102 K along the c axis coexisting with orbital-dependent intralayer metamagnetism around T* ∼ 50 K [1]. Since a strong spin-phonon coupling has been proposed in this material, we performed detailed thermodynamic investigations by means of dilatometry as well as by SQUID magnetometry under pressure. Measurements of magnetostriction, thermal expansion and magnetization were performed on single crystalline samples in the temperature range T = 2 –200 K at magnetic fields up to 15 T. The crystal expansion exhibits a highly anisotropic behavior. Signatures of the ferromagnetic phase-transition were found for both directions. Further distinct anomalies are visible in the lower temperature region, which could be correlated to the metamagnetic transition at T*. By combining the changes of the thermal expansion and the heat-capacity at the ferromagnetic transition, a strong volumetric pressure dependence of dTc/dp ∼ -8 K/ GPa has been revealed. Additional measurements of magnetization under hydrostatic pressure have been done in order to verify this big negative value.
V. Granata et. al., J. Phys.: Cond. Mat. 25 (2013) 056004