Magnetoentropic signatures of the textured metamagnetic phase of an antiferromagnetic polar metal: Ca3Ru2O7

Naoki Kikugawa, Dmitry A. Sokolov, Chanchal Sow, Yoshiteru Maeno, Andrew Peter Mackenzie

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Abstract

We report the magnetocaloric effect of a bilayered perovskite ruthenate Ca3Ru2Othat has recently been recognized as an antiferromagnetic polar metal. The magnetic entropy change obtained from temperature dependence of the DC magnetization measurements shows peaks and valleys under the magnetic field near metamagnetic transitions, and enable us to map out a thermodynamic field–temperature phase-diagram. The area surrounded by the boundaries agrees well with a novel “metamagnetic texture” with spin modulation observed recently by small angle neutron scattering measurements. We demonstrate that a thermodynamically equilibrium state is realized between the antiferromagnetic and spin-polarized states throughout the metamagnetic transition in this polar metal.
Original languageEnglish
Article number103704
Number of pages5
JournalJournal of the Physical Society of Japan
Volume90
Issue number10
Early online date21 Sept 2021
DOIs
Publication statusPublished - 15 Oct 2021

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