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TT: Fachverband Tiefe Temperaturen

TT 72: SrTiO₃: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor II (joint session TT/KFM/MA/O)

TT 72.7: Talk

Thursday, March 21, 2024, 16:45–17:00, H 0104

Emergence of strain-Induced magnetism in plastically-deformed SrTiO3 at low temperature — •Anirban Kundu¹, Xi Wang², Avraham Klein¹, and Beena Kalisky² — ¹Department of Physics, Ariel University, Israel — ²Institute of Nanotechnology & Advanced Materials, Bar-Ilan University, Israel

It is well established that SrTiO3 (STO) can possess ferroelectric states alongside observed superconducting states. However, so far, the phenomena of magnetism have not been established. In our collaborative work, in a plastically deformed bulk STO sample; SQUID measurements reveal strong magnetic signals which are completely absent in pristine samples. This strain-induced magnetism has two salient features. First, the magnetic moment is seen only with applied strain and increases with applied strain. Second, it also increases with temperature. Using Ginzberg Landau theory we show that these properties may be the result of coupling terms between strain, polar, and magnetic orders centered around dislocation walls induced by the plastic deformation. Our analysis implies that deformed STO is a quantum multiferroic.

Keywords: SrTio3; STO; Quantum material; Ferroelectric; plastic deformation