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Title: Multicomponent fluctuation spectrum at the quantum critical point in CeCu 6-xAg x

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.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3];  [4]; ORCiD logo [3];  [5]; ORCiD logo [3];  [6]; ORCiD logo [6]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Maryland, College Park, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Irvine, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1570141
Alternate Identifier(s):
OSTI ID: 1570632
Report Number(s):
LA-UR-17-22928
Journal ID: ISSN 2397-4648
Grant/Contract Number:  
AC05-00OR22725; DMR-1508249; 89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
npj Quantum Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Material Science; quantum critical point, neutron scattering

Citation Formats

Poudel, Lekh, Lawrence, Jon M., Wu, Liusuo, Ehlers, Georg, Qiu, Yiming, May, Andrew F., Ronning, Filip, Lumsden, Mark D., Mandrus, David, and Christianson, Andrew D. Multicomponent fluctuation spectrum at the quantum critical point in CeCu6-xAgx. United States: N. p., 2019. Web. doi:10.1038/s41535-019-0191-y.
Poudel, Lekh, Lawrence, Jon M., Wu, Liusuo, Ehlers, Georg, Qiu, Yiming, May, Andrew F., Ronning, Filip, Lumsden, Mark D., Mandrus, David, & Christianson, Andrew D. Multicomponent fluctuation spectrum at the quantum critical point in CeCu6-xAgx. United States. doi:10.1038/s41535-019-0191-y.
Poudel, Lekh, Lawrence, Jon M., Wu, Liusuo, Ehlers, Georg, Qiu, Yiming, May, Andrew F., Ronning, Filip, Lumsden, Mark D., Mandrus, David, and Christianson, Andrew D. Thu . "Multicomponent fluctuation spectrum at the quantum critical point in CeCu6-xAgx". United States. doi:10.1038/s41535-019-0191-y. https://www.osti.gov/servlets/purl/1570141.
@article{osti_1570141,
title = {Multicomponent fluctuation spectrum at the quantum critical point in CeCu6-xAgx},
author = {Poudel, Lekh and Lawrence, Jon M. and Wu, Liusuo and Ehlers, Georg and Qiu, Yiming and May, Andrew F. and Ronning, Filip and Lumsden, Mark D. and Mandrus, David and Christianson, Andrew D.},
abstractNote = {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.},
doi = {10.1038/s41535-019-0191-y},
journal = {npj Quantum Materials},
number = 1,
volume = 4,
place = {United States},
year = {2019},
month = {10}
}

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Works referenced in this record:

Quantum critical phenomena
journal, August 1976


Critical quasiparticle theory applied to heavy fermion metals near an antiferromagnetic quantum phase transition
journal, February 2012

  • Abrahams, E.; Wolfle, P.
  • Proceedings of the National Academy of Sciences, Vol. 109, Issue 9
  • DOI: 10.1073/pnas.1200346109

Strong-coupling theory of heavy-fermion criticality
journal, July 2014


Grüneisen Ratio Divergence at the Quantum Critical Point in C e C u 6 x A g x
journal, August 2004


Fermi-surface collapse and dynamical scaling near a quantum-critical point
journal, July 2010

  • Friedemann, S.; Oeschler, N.; Wirth, S.
  • Proceedings of the National Academy of Sciences, Vol. 107, Issue 33
  • DOI: 10.1073/pnas.1009202107

Local fluctuations in quantum critical metals
journal, September 2003


Magnetic fluctuations at the field-tuned vs. concentration-tuned quantum phase transition in
journal, March 2007

  • Löhneysen, H. v.; Stockert, O.; Enderle, M.
  • Journal of Magnetism and Magnetic Materials, Vol. 310, Issue 2
  • DOI: 10.1016/j.jmmm.2006.10.1130

Divergence of the Grüneisen Ratio at Quantum Critical Points in Heavy Fermion Metals
journal, August 2003


Scaling of Magnetic Fluctuations near a Quantum Phase Transition
journal, June 1998


Quantum Criticality in Quasi-Two-Dimensional Itinerant Antiferromagnets
journal, October 2015


Investigation of non-Fermi-liquid behavior in CeCu6−xAux
journal, June 1996


Two-Dimensional Fluctuations at the Quantum-Critical Point of CeCu 6 x Au x
journal, June 1998


Onset of antiferromagnetism in heavy-fermion metals
journal, September 2000

  • Schröder, A.; Aeppli, G.; Coldea, R.
  • Nature, Vol. 407, Issue 6802
  • DOI: 10.1038/35030039

From Incommensurate Correlations to Mesoscopic Spin Resonance in YbRh 2 Si 2
journal, September 2012


A neutron scattering study of magnetic excitations in the heavy fermion compound CeCu 6
journal, January 1987

  • Regnault, L. P.; Erkelens, W. A. C.; Rossat-Mignod, J.
  • Journal of Magnetism and Magnetic Materials, Vol. 63-64
  • DOI: 10.1016/0304-8853(87)90588-9

Fermi-liquid instabilities at magnetic quantum phase transitions
journal, August 2007

  • Löhneysen, Hilbert v.; Rosch, Achim; Vojta, Matthias
  • Reviews of Modern Physics, Vol. 79, Issue 3
  • DOI: 10.1103/RevModPhys.79.1015

Antiferromagnetic criticality at a heavy-fermion quantum phase transition
journal, September 2009

  • Knafo, W.; Raymond, S.; Lejay, P.
  • Nature Physics, Vol. 5, Issue 10
  • DOI: 10.1038/nphys1374

The break-up of heavy electrons at a quantum critical point
journal, July 2003

  • Custers, J.; Gegenwart, P.; Wilhelm, H.
  • Nature, Vol. 424, Issue 6948
  • DOI: 10.1038/nature01774

Avoided Antiferromagnetic Order and Quantum Critical Point in C e C o I n 5
journal, December 2003


Locally critical quantum phase transitions in strongly correlated metals
journal, October 2001

  • Si, Qimiao; Rabello, Silvio; Ingersent, Kevin
  • Nature, Vol. 413, Issue 6858
  • DOI: 10.1038/35101507

Quantum critical fluctuations in the heavy fermion compound Ce(Ni 0.935 Pd 0.065 ) 2 Ge 2
journal, December 2014


Magnetization and specific heat of CeCu6−xMx (MNi, Pd, Pt)
journal, June 1996


Non-Fermi-Liquid Behavior at a Ferromagnetic Quantum Critical Point in Ni x Pd 1 x
journal, May 1999


Dynamic Scaling in the Susceptibility of the Spin- 1 2 Kagome Lattice Antiferromagnet Herbertsmithite
journal, April 2010


Magnetic order and transport in the heavy-fermion system CeCu Au
journal, October 1998

  • von Löhneysen, H.; Neubert, A.; Pietrus, T.
  • The European Physical Journal B, Vol. 5, Issue 3
  • DOI: 10.1007/s100510050465

Quantum phase transitions: experimental facts—a challenge for theory
journal, August 2002


Spin Fluctuation in Heavy Fermion C e R u 2 S i 2
journal, March 2004


Long-range magnetic order in Ce(Cu 1-x Ag x ) 6
journal, January 1992

  • Gangopadhyay, A. K.; Lettau, K.; Lettau, C.
  • Journal of Magnetism and Magnetic Materials, Vol. 103, Issue 3
  • DOI: 10.1016/0304-8853(92)90199-X

Evidence for a Common Physical Description of Non-Fermi-Liquid Behavior in Chemically Substituted f -Electron Systems
journal, December 1998


Non-Fermi-Liquid Scaling of the Magnetic Response in UCu 5 x Pd x ( x = 1 , 1.5 )
journal, July 1995


A quantum multi-critical point in CeCu6−xAux
journal, November 2006


Quantum criticality and universal scaling of a quantum antiferromagnet
journal, March 2005

  • Lake, Bella; Tennant, D. Alan; Frost, Chris D.
  • Nature Materials, Vol. 4, Issue 4
  • DOI: 10.1038/nmat1327

Structural and magnetic phase transitions in CeCu 6 x T x ( T = Ag , Pd )
journal, December 2015


Quantum criticality in heavy-fermion metals
journal, March 2008

  • Gegenwart, Philipp; Si, Qimiao; Steglich, Frank
  • Nature Physics, Vol. 4, Issue 3
  • DOI: 10.1038/nphys892

Inelastic neutron scattering study of cerium heavy fermion compounds
journal, December 1988

  • Rossat-Mignod, J.; Regnault, L. P.; Jacoud, J. L.
  • Journal of Magnetism and Magnetic Materials, Vol. 76-77
  • DOI: 10.1016/0304-8853(88)90429-5

LaCu 6 x Ag x : A promising host of an elastic quantum critical point
journal, May 2018


Heavy Fermions and Quantum Phase Transitions
journal, September 2010


Local quantum criticality in the two-dimensional dissipative quantum XY model
journal, May 2015


Effect of a nonzero temperature on quantum critical points in itinerant fermion systems
journal, September 1993


How do Fermi liquids get heavy and die?
journal, August 2001


Candidate Elastic Quantum Critical Point in LaCu 6 x Au x
journal, November 2016


Magnetic Fluctuations at a Field-Induced Quantum Phase Transition
journal, December 2007


Hidden fluctuations close to a quantum bicritical point
journal, December 2017


Ground state of a quantum critical system: Neutron scattering on Ce ( Ru 1 x Fe x ) 2 Ge 2
journal, August 2007