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One-component order parameter in URu2Si2 uncovered by resonant ultrasound spectroscopy and machine learning

Cornell Affiliated Author(s)

Author

Sayak Ghosh
Michael Matty
Ryan Baumbach
Eric Bauer
K. Modic
Arkady Shekhter
J. Mydosh
Eun-Ah Kim
B. Ramshaw

Abstract

The unusual correlated state that emerges in URu2Si2 below THO = 17.5 K is known as “hidden order†because even basic characteristics of the order parameter, such as its dimensionality (whether it has one component or two), are “hidden.†We use resonant ultrasound spectroscopy to measure the symmetry-resolved elastic anomalies across THO. We observe no anomalies in the shear elastic moduli, providing strong thermodynamic evidence for a one-component order parameter. We develop a machine learning framework that reaches this conclusion directly from the raw data, even in a crystal that is too small for traditional resonant ultrasound. Our result rules out a broad class of theories of hidden order based on two-component order parameters, and constrains the nature of the fluctuations from which unconventional superconductivity emerges at lower temperature. Our machine learning framework is a powerful new tool for classifying the ubiquitous competing orders in correlated electron systems. © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

Date Published

Journal

Science Advances

Volume

6

Issue

10

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85081954078&doi=10.1126%2fsciadv.aaz4074&partnerID=40&md5=5d883120e877da9787536ebeb1f9cdff

DOI

10.1126/sciadv.aaz4074

Group (Lab)

Brad Ramshaw Group

Funding Source

DE-SC0018946
DMR-1539918
DMR-1752784
1719875
1752784
DMR-1719875

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