Multicomponent fluctuation spectrum at the quantum critical point in CeCu6−xAgx

Lekh Poudel; Jon M. Lawrence; Liusuo S. Wu; Georg Ehlers; Yiming Qiu; Andrew F. May; Filip Ronning; Mark D. Lumsden; David Mandrus; Andrew D. Christianson

doi:10.1038/s41535-019-0191-y

Multicomponent fluctuation spectrum at the quantum critical point in CeCu_6−xAg_x

Lekh Poudel, Jon M. Lawrence, Liusuo S. Wu, Georg Ehlers, Yiming Qiu, Andrew F. May, Filip Ronning, Mark D. Lumsden, David Mandrus, Andrew D. Christianson

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Quantum critical points (QCPs) are widely accepted as a source of a diverse set of collective quantum phases of matter. The basic nature of a QCP is manifested in the critical fluctuation spectrum which in turn is determined by the adjacent phases and associated order parameters. Here we show that the critical fluctuation spectrum of CeCu_5.8Ag_0.2 can not be explained by fluctuations associated with a single wave vector. Interestingly, when the critical fluctuations at wave vectors corresponding to the incommensurate antiferromagnetic order adjacent to the QCP are separated they are found to be three dimensional and to obey the scaling behavior expected for long wavelength fluctuations near an itinerant antiferromagnetic QCP. Without this separation, E/T scaling with a fractional exponent is observed. Together these results demonstrate that a multicomponent fluctuation spectrum is a previously unexplored route to obtaining E/T scaling at a QCP.

Original language	English
Article number	52
Journal	npj Quantum Materials
Volume	4
Issue number	1
DOIs	https://doi.org/10.1038/s41535-019-0191-y
State	Published - Dec 1 2019

Funding

We acknowledge W. Tian for help with sample characterization and C. D. Batista, T. Williams, R. Baumbach, J. W. Lynn, and N. P. Butch for useful discussions. The research at the Spallation Neutron Source at Oak Ridge National Laboratory is supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (DOE). A.D.C., A.F.M. and D.M. acknowledge support from the U. S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Work at LANL was supported by the U.S. DOE, Basic Energy Sciences, Division of Materials Sciences and Engineering. The work at the NIST Center for Neutron Research utilized facilities supported in part by the National Science Foundation under Agreement No. DMR-1508249. This paper has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The identification of any commercial product or a trade name does not necessarily imply endorsement or recommendation by the National Institute of Standards and Technology.

Funders	Funder number
Office of Basic Energy Sciences
Scientific User Facilities Division
U. S. DOE
U.S. DOE
National Science Foundation
U.S. Department of Energy
National Institute of Standards and Technology
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering

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abstract = "Quantum critical points (QCPs) are widely accepted as a source of a diverse set of collective quantum phases of matter. The basic nature of a QCP is manifested in the critical fluctuation spectrum which in turn is determined by the adjacent phases and associated order parameters. Here we show that the critical fluctuation spectrum of CeCu5.8Ag0.2 can not be explained by fluctuations associated with a single wave vector. Interestingly, when the critical fluctuations at wave vectors corresponding to the incommensurate antiferromagnetic order adjacent to the QCP are separated they are found to be three dimensional and to obey the scaling behavior expected for long wavelength fluctuations near an itinerant antiferromagnetic QCP. Without this separation, E/T scaling with a fractional exponent is observed. Together these results demonstrate that a multicomponent fluctuation spectrum is a previously unexplored route to obtaining E/T scaling at a QCP.",

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AU - Wu, Liusuo S.

AU - Ehlers, Georg

AU - Qiu, Yiming

AU - May, Andrew F.

AU - Ronning, Filip

AU - Lumsden, Mark D.

AU - Mandrus, David

AU - Christianson, Andrew D.

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Multicomponent fluctuation spectrum at the quantum critical point in CeCu_6−xAg_x

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