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 language | English |
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Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 97 |
DOIs | |
Publication status | Published - 11 Aug 2006 |
Keywords
- QUALITY SINGLE-CRYSTALS
- RUTHENATE SR3RU2O7
- METAMAGNETISM
- FLUCTUATIONS
- ELECTRONS
- METALS