Multiple first-order metamagnetic transitions and quantum oscillations in ultrapure Sr3Ru2O7.

@article{Perry2004MultipleFM,
  title={Multiple first-order metamagnetic transitions and quantum oscillations in ultrapure Sr3Ru2O7.},
  author={R S Perry and Kentaro Kitagawa and S. A. Grigera and Rodolfo Alberto Borzi and Andrew P. Mackenzie and Kenji Ishida and Yoshiteru Maeno},
  journal={Physical review letters},
  year={2004},
  volume={92 16},
  pages={
          166602
        }
}
We present measurements on ultraclean single crystals of the bilayered ruthenate metal Sr3Ru2O7, which has a magnetic-field-tuned quantum critical point. Quantum oscillations of differing frequencies can be seen in the resistivity both below and above its metamagnetic transition. This frequency shift corresponds to a small change in the Fermi surface volume that is qualitatively consistent with the small moment change in the magnetization across the metamagnetic transition. Very near the… 
Flat bands and enigma of metamagnetic quantum critical regime in Sr3Ru2O7
Abstract Understanding the nature of field-tuned metamagnetic quantum criticality in the ruthenate Sr3Ru2O7 has presented a significant challenge within condensed matter physics. It is known from
Metamagnetic quantum criticality revealed by 17O-NMR in the itinerant metamagnet Sr3Ru2O7.
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Comparison between uniform susceptibility and 1/T1T reveals that antiferromagnetic fluctuations instead of two-dimensional ferrom magnetic fluctuations dominate the spin fluctuation spectrum at the critical field, which is unexpected for itinerant metamagnetism.
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A study of the ferromagnetism of ZrZn2, the most promising material to exhibit ferromagnetic quantum criticality, at low temperatures T as a function of pressure p finds that the orderedFerromagnetic moment disappears discontinuously at p(c)=16.5 kbar, strongly suggesting that QPT in itinerant ferromagnets are always first order.
Thermal conductivity in the vicinity of the quantum critical end point in Sr3Ru2O7.
TLDR
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.
Role of domain wall fluctuations in non-Fermi-liquid behavior of metamagnets.
  • V. Zyuzin, A. Zyuzin
  • Physics, Medicine
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  • 2013
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This paper shows that, in the case of weak pinning, the spin relaxation time of the domain wall, which separates the two phases, is much larger than that of the volume spin fluctuations, which leads to quasi-linear low temperature dependence of resistivity.
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A detailed study of the different components of the magnetization vector as a function of temperature, applied magnetic field, and varying angle in Sr4Ru3O10 finds for the first time a reduction of the magnetic moment in the plane of rotation at the metamagnetic transition.
Phase bifurcation and quantum fluctuations in Sr3Ru2O7.
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Drawing on fresh experimental data, it is shown that the complex phase behavior reported here can be fully accommodated within the framework of a simple Landau theory.
Anisotropy of the low-temperature magnetostriction of Sr3Ru2O7
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Disorder-Sensitive Phase Formation Linked to Metamagnetic Quantum Criticality
TLDR
Experimental evidence is presented for the formation of a nonsuperconducting phase in the vicinity of a magnetic field–tuned quantum critical point in ultrapure crystals of the ruthenate metal Sr3Ru2O7, and the possibility that the observed phase is due to a spin-dependent symmetry-breaking Fermi surface distortion is discussed.
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