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Title: A Local Quantum Phase Transition in YFe2Al10

Abstract

Here, a phase transition occurs when correlated regions of a new phase grow to span the system and the fluctuations within the correlated regions become long-lived. Here we present neutron scattering measurements showing that this conventional picture must be replaced by a new paradigm in YFe2Al10, a compound that forms naturally very close to a T = 0 quantum phase transition. Fully quantum mechanical fluctuations of localized moments are found to diverge at low energies and temperatures, however the fluctuating moments are entirely without spatial correlations. Zero temperature order in YFe2Al10 is achieved by a new and entirely local type of quantum phase transition that may originate with the creation of the moments themselves.

Authors:
 [1]; ORCiD logo [2];  [3];  [2];  [4];  [5];  [1]
  1. Texas A & M Univ., College Station, TX (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (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. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1440349
Report Number(s):
BNL-205727-2018-JAAM
Journal ID: ISSN 0027-8424
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 27; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Gannon, W J., Zaliznyak, Igor A., Wu, L. S., Tsvelik, A. M., Qiu, Y., Rodriguez-Rivera, J. A., and Aronson, M. C. A Local Quantum Phase Transition in YFe2Al10. United States: N. p., 2018. Web. doi:10.1073/pnas.1721493115.
Gannon, W J., Zaliznyak, Igor A., Wu, L. S., Tsvelik, A. M., Qiu, Y., Rodriguez-Rivera, J. A., & Aronson, M. C. A Local Quantum Phase Transition in YFe2Al10. United States. doi:10.1073/pnas.1721493115.
Gannon, W J., Zaliznyak, Igor A., Wu, L. S., Tsvelik, A. M., Qiu, Y., Rodriguez-Rivera, J. A., and Aronson, M. C. Mon . "A Local Quantum Phase Transition in YFe2Al10". United States. doi:10.1073/pnas.1721493115. https://www.osti.gov/servlets/purl/1440349.
@article{osti_1440349,
title = {A Local Quantum Phase Transition in YFe2Al10},
author = {Gannon, W J. and Zaliznyak, Igor A. and Wu, L. S. and Tsvelik, A. M. and Qiu, Y. and Rodriguez-Rivera, J. A. and Aronson, M. C.},
abstractNote = {Here, a phase transition occurs when correlated regions of a new phase grow to span the system and the fluctuations within the correlated regions become long-lived. Here we present neutron scattering measurements showing that this conventional picture must be replaced by a new paradigm in YFe2Al10, a compound that forms naturally very close to a T = 0 quantum phase transition. Fully quantum mechanical fluctuations of localized moments are found to diverge at low energies and temperatures, however the fluctuating moments are entirely without spatial correlations. Zero temperature order in YFe2Al10 is achieved by a new and entirely local type of quantum phase transition that may originate with the creation of the moments themselves.},
doi = {10.1073/pnas.1721493115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 27,
volume = 115,
place = {United States},
year = {2018},
month = {6}
}

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Figures / Tables:

Fig. 1 Fig. 1: Spatially localized magnetic fluctuations in YFe2Al10. (A) The intensity of neutrons scattered with energy transfer 0.5 meV in the [0,K,L] plane at 0.07 K in fields of 0.025 T (left) and 9 T (right), and their difference $I$(0 T)-$I$(9 T) (B). The tails of nuclear Bragg peaks aremore » clearly observed in (A) at integer values of K and L. A diffuse ridge of scattering is evident along [0,0,L] at $q$$K$ = 0 reciprocal lattice units (rlu). Data are monitor normalized. (C) Wave vector $q$$K$ dependence of the $q$$L$ integrated intensity $I$( $q$$K$) is better described by the YFe2Al10 magnetic form factor $F ^{2}_{xz, yz}$($q$$K$) from electronic structure calculations (black line, also Supplementary Information) than isotropic Fe2+ form factor (green line). Both form factors are scaled to the data. Strong anisotropy in the intensity indicates that $d$$xz,yz$ orbitals dominate. (D) The $T$ = 0.07 K structure factor $S$($q$$K$) is isolated for different fixed energies by dividing $I$($q$$K$) by $F ^{2}_{xz, yz}$($q$$K$) . Solid lines are obtained by fitting $I$($q$$K$) to a Lorentzian and dividing by the computed $F ^{2}_{xz, yz}$($q$$K$), demonstrating that $S$($q$$K$) is independent of wave vector $q$$K$. Inset: The correspondence between the scattering wave vectors $q$$K$ and $q$$L$ and the $ac$-planes containing the nearly square Fe-nets in YFe2Al10. Magnetic field is oriented in the critical $ac$ plane along the (100) direction. All data were measured on MACS. Error bars in each figure represent one standard deviation.« less

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