April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)
Symposium Supporters
2024 MRS Spring Meeting & Exhibit
QT04.03.19

Strain-Switchable Field-Induced Superconductivity

When and Where

Apr 23, 2024
5:00pm - 7:00pm
Flex Hall C, Level 2, Summit

Presenter(s)

Co-Author(s)

Shua Sanchez1,Philip Ryan2,Jiun-Haw Chu3

Massachusetts Institute of Technology1,Argonne National Laboratory2,University of Washington3

Abstract

Shua Sanchez1,Philip Ryan2,Jiun-Haw Chu3

Massachusetts Institute of Technology1,Argonne National Laboratory2,University of Washington3
Field-induced superconductivity is a rare phenomenon where an applied magnetic field enhances or induces superconductivity. Here, we use applied stress as a control switch between a field-tunable superconducting state and a robust non–field-tunable state. This marks the first demonstration of a strain-tunable superconducting spin valve with infinite magnetoresistance. We combine tunable uniaxial stress and applied magnetic field on the ferromagnetic superconductor Eu(Fe<sub>0.88</sub>Co<sub>0.12</sub>)<sub>2</sub>As<sub>2</sub> to shift the field-induced zero-resistance temperature between 4 K and a record-high value of 10 K. We use x-ray diffraction and spectroscopy measurements under stress and field to reveal that strain tuning of the nematic order and field tuning of the ferromagnetism act as independent control parameters of the superconductivity. Combining comprehensive measurements with DFT calculations, we propose that field-induced superconductivity arises from a novel mechanism, namely, the uniquely dominant effect of the Eu dipolar field when the exchange field splitting is nearly zero. Finally, we introduce a device architecture which uses combined strain and field to make a metal/superconductor toggle switch.

Keywords

piezoresponse

Symposium Organizers

Liangzi Deng, University of Houston
Qiang Li, Stony Brook University/Brookhaven National Laboratory
Toshinori Ozaki, Kwansei Gakun University
Ruidan Zhong, Shanghai Jiao Tong University

Symposium Support

Gold
Faraday Factory Japan LLC

Session Chairs

Liangzi Deng
Yusuke Ichino

In this Session