Thermal conductivity in the vicinity of the quantum critical end point in Sr3Ru2O7

F. Ronning, R. W. Hill, M. Sutherland, D. G. Hawthorn, M. A. Tanatar, J. Paglione, Louis Taillefer, M. J. Graf, R. S. Perry, Y. Maeno, A. P. Mackenzie

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Thermal conductivity of Sr3Ru2O7 was measured down to 40 mK and at magnetic fields through the quantum critical end point at H-c=7.85 T. A peak in the electrical resistivity as a function of the field was mimicked by the thermal resistivity. In the limit as T -> 0 K, we find that the Wiedemann-Franz law is satisfied to within 5% at all fields, implying that there is no breakdown of the electron despite the destruction of the Fermi liquid state at quantum criticality. A significant change in disorder [from rho(0)(H=0 T)=2.1 to 0.5 mu Omega cm] does not influence our conclusions. At finite temperatures, the temperature dependence of the Lorenz number is consistent with ferromagnetic fluctuations causing the non-Fermi liquid behavior as one would expect at a metamagnetic quantum critical end point.

Original languageEnglish
Number of pages4
JournalPhysical Review Letters
Volume97
DOIs
Publication statusPublished - 11 Aug 2006

Keywords

  • QUALITY SINGLE-CRYSTALS
  • RUTHENATE SR3RU2O7
  • METAMAGNETISM
  • FLUCTUATIONS
  • ELECTRONS
  • METALS

Fingerprint

Dive into the research topics of 'Thermal conductivity in the vicinity of the quantum critical end point in Sr3Ru2O7'. Together they form a unique fingerprint.

Cite this