Dissemin is shutting down on January 1st, 2025

Published in

arXiv, 2021

DOI: 10.48550/arxiv.2106.15854

Nature Research, Nature Communications, 1(12), 2021

DOI: 10.1038/s41467-021-26068-3

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Magnetic-field-controlled spin fluctuations and quantum criticality in Sr3Ru2O7

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractWhen 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. Sr3Ru2O7 can be tuned through quantum criticality with magnetic field at low temperature. Near its critical field Bc it displays the hallmark T-linear resistivity and a $T\,{{{{{{\mathrm{log}}}}}}}\,(1/T)$ T log ( 1 / T ) 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 Bc is approached. The large increase in the electronic heat capacity and entropy near Bc 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 Bc, the fluctuations become stronger suggesting that the order is stabilised through an “order-by-disorder” mechanism.