Low temperature thermodynamic investigation of the phase diagram of Sr3Ru2O7
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We studied the phase diagram of Sr3Ru2O7 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 ΔC/T∼−logT 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.
Sun , D , Rost , A W , Perry , R S , Mackenzie , A P & Brando , M 2018 , ' Low temperature thermodynamic investigation of the phase diagram of Sr 3 Ru 2 O 7 ' Physical Review. B, Condensed matter and materials physics , vol. 97 , no. 11 , 115101 . DOI: 10.1103/PhysRevB.97.115101
Physical Review. B, Condensed matter and materials physics
© 2018 American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevB.97.115101
DescriptionThis work was supported by the Engineering and Physical Sciences Research Council, UK (grant EP/F044704/1) and the Max Planck Society.
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