Magnetic-field-controlled spin fluctuations and quantum critically in Sr 3 Ru 2 O 7 .

Autor: Lester C; H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol, BS8 1TL, UK., Ramos S; School of Physical Sciences, University of Kent, Canterbury, CT2 7NH, UK., Perry RS; London Centre for Nanotechnology, University College London, London, WC1H 0AH, UK., Croft TP; H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol, BS8 1TL, UK., Laver M; School of Physics and Astronomy, University of Birmingham, Birmingham, BT15 2TT, UK., Bewley RI; ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK., Guidi T; ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK., Hiess A; Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble, France.; European Spallation Source ERIC, P.O. Box 176, 22100, Lund, Sweden., Wildes A; Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble, France., Forgan EM; School of Physics and Astronomy, University of Birmingham, Birmingham, BT15 2TT, UK., Hayden SM; H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol, BS8 1TL, UK. s.hayden@bristol.ac.uk.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2021 Oct 04; Vol. 12 (1), pp. 5798. Date of Electronic Publication: 2021 Oct 04.
DOI: 10.1038/s41467-021-26068-3
Abstrakt: When the transition temperature of a continuous phase transition is tuned to absolute zero, new ordered phases and physical behaviour emerge in the vicinity of the resulting quantum critical point. Sr 3 Ru 2 O 7 can be tuned through quantum criticality with magnetic field at low temperature. Near its critical field B c it displays the hallmark T-linear resistivity and a [Formula: see text] electronic heat capacity behaviour of strange metals. However, these behaviours have not been related to any critical fluctuations. Here we use inelastic neutron scattering to reveal the presence of collective spin fluctuations whose relaxation time and strength show a nearly singular variation with magnetic field as B c is approached. The large increase in the electronic heat capacity and entropy near B c can be understood quantitatively in terms of the scattering of conduction electrons by these spin-fluctuations. On entering the spin-density-wave ordered phase present near B c , the fluctuations become stronger suggesting that the order is stabilised through an "order-by-disorder" mechanism.
(© 2021. The Author(s).)
Databáze: MEDLINE
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