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Low temperature thermodynamic investigation of the phase diagram of Sr3Ru2O7

Sun, D; Rost, AW; Perry, RS; Mackenzie, AP; Brando, M; (2018) Low temperature thermodynamic investigation of the phase diagram of Sr3Ru2O7. Physical Review B , 97 (11) 10.1103/PhysRevB.97.115101. Green open access

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Abstract

We studied the phase diagram of Sr 3 Ru 2 O 7 by means of heat capacity and magnetocaloric effect measurements at temperatures as low as 0.06 K and fields up to 12 T. We confirm the presence of a new quantum critical point at 7.5 T which is characterized by a strong non-Fermi-liquid behavior of the electronic specific heat coefficient Δ C / T ∼ − log T over more than a decade in temperature, placing strong constraints on theories of its criticality. In particular logarithmic corrections are found when the dimension d is equal to the dynamic critical exponent z , in contrast to the conclusion of a two-dimensional metamagnetic quantum critical end point, recently proposed. Moreover, we achieved a clear determination of the new second thermodynamic phase adjoining the first one at lower temperatures. Its thermodynamic features differ significantly from those of the dominant phase and characteristics expected of classical equilibrium phase transitions are not observed, indicating fundamental differences in the phase formation.

Type: Article
Title: Low temperature thermodynamic investigation of the phase diagram of Sr3Ru2O7
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.97.115101
Publisher version: http://doi.org/10.1103/PhysRevB.97.115101
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Magnetocaloric effect, Quantum criticality, Quantum phase transitions, Specific heat
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10045848
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