V. R. Shaginyan, A. Z. Msezane, K. G. Popov, J. W. Clark, M. V. Zverev, V. A. Khodel
Understanding the nature of magnetic field-tuned quantum criticality in the magnetic ruthenate Sr3Ru2O7 has presented a significant challenge within condensed matter physics. Attention has centered on the role of quantum criticality in the formation of an ordered phase existing within a restricted range of magnetic fields at low temperatures. It is known from experiment that the ordered phase possesses large entropy and that the magnetoresistivity experiences steep jumps near the ordered phase, with a step-like growth followed by a similarly abrupt drop. Data collected on Sr3Ru2O7 allow us to provide qualitative insights into the critical regime and its quantum critical points (QCPs) obscured by the ordered phase. We find a challenging connection between Sr3Ru2O7 and heavy-fermion metals expressing universal physics that transcends microscopic details. Our analysis of Sr3Ru2O7 unambiguously implies an interpretation of its extraordinary low-temperature behavior in terms of QCP associated with a fermion condensate leading to the formation of a flat band that generates both the entropy growth and the magnetoresistivity jumps at the QCPs.
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http://arxiv.org/abs/1211.4205
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