Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N43: Magnetic Topological Semimetals
11:30 AM–2:18 PM,
Wednesday, March 8, 2023
Room: Room 317
Sponsoring
Unit:
DMP
Chair: Shiming Lei, Rice University
Abstract: N43.00004 : Magneto-optical probes shed light on the unconventional resistivity of EuCd2P2
12:06 PM–12:18 PM
Presenter:
Veronika Sunko
(UC Berkeley)
Authors:
Veronika Sunko
(UC Berkeley)
Yue Sun
(University of California, Berkeley)
Mayia A Vranas
(University of California, San Diego)
Christopher C Homes
(Brookhaven National Laboratory)
Changmin Lee
(Lawrence Berkeley National Laboratory)
Elizabeth Donoway
(University of California, Berkeley)
Zhi-Cheng Wang
(Boston College)
Sudhaman Balguri
(Boston College)
Mira Mahendru
(Boston College)
Mira Mahendru
(Boston College)
Alejandro Ruiz
(University of California, San Diego)
Brandon Gunn
(UC San Diego)
Santiago Blanco-Canosa
(Donostia International Physics Center)
Rourav Basak
(University of California, San Diego)
Enrico Schierle
(Helmholtz-Zentrum Berlin)
Eugen Weschke
(Helmholtz-Zentrum Berlin)
Fazel Tafti
(Boston College)
Alex Frano
(UC San Diego)
Joseph W Orenstein
(UC Berkeley)
Here we introduce a new experimental technique designed to sensitively detect optical birefringence proportional to an applied magnetic field, which we refer to as linear magneto-birefringence (LMB). We discuss the role of LMB as a powerful probe of magnetic order, as it is allowed by Onsager’s relations only in systems which simultaneously break time-reversal symmetry and three-fold rotational symmetry. We measure LMB in EuCd2P2, a material which stands out due to the unusual temperature dependence of its resistivity: metallic behavior at high temperatures is followed by a 100-fold increase of resistivity with decreasing temperature. Remarkably, resistivity peaks at 18K, well above the Neel temperature of 11K. Using a powerful combination of our new technique and resonant x-ray scattering we reveal a far richer picture of EuCd2P2 magnetism than has been previously reported, helping to resolve this mystery.
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