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Quantum criticality in heavy-fermion metals
Quantum criticality describes the collective fluctuations of matter undergoing a second-order phase transition at zero temperature. Heavy-fermion metals have in recent years emerged as prototypicalExpand
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Quantum phase transitions in holographic models of magnetism and superconductors
We study a holographic model realizing an "antiferromagnetic" phase in which a global SU(2) symmetry representing spin is broken down to a U(1) by the presence of a finite electric charge density.Expand
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Locally critical quantum phase transitions in strongly correlated metals
When a metal undergoes a continuous quantum phase transition, non-Fermi-liquid behaviour arises near the critical point. All the low-energy degrees of freedom induced by quantum criticality areExpand
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Universally diverging Grüneisen parameter and the magnetocaloric effect close to quantum critical points.
At a generic quantum critical point, the thermal expansion alpha is more singular than the specific heat c(p). Consequently, the "Grüneisen ratio," Gamma=alpha/c(p), diverges. When scaling applies,Expand
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Orbital-selective Mott phase in multiorbital models for alkaline iron selenides K1-xFe2-ySe2.
  • R. Yu, Q. Si
  • Materials Science, Physics
  • Physical review letters
  • 28 August 2012
We study a multiorbital model for the alkaline iron selenides K(1-x)Fe(2-y)Se(2) using a slave-spin method. With or without ordered vacancies, we identify a metal-to-Mott-insulator transition at theExpand
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Fermi surface reconstruction and multiple quantum phase transitions in the antiferromagnet CeRhIn5
  • L. Jiao, Ye Chen, +15 authors H. Yuan
  • Physics, Medicine
  • Proceedings of the National Academy of Sciences
  • 5 January 2015
Significance Conventional, thermally driven continuous phase transitions are described by universal critical behavior that is independent of microscopic details of a specific material. An analogousExpand
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Local fluctuations in quantum critical metals
We show that spatially local, yet low-energy, fluctuations can play an essential role in the physics of strongly correlated electron systems tuned to a quantum critical point. A detailed microscopicExpand
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Quantum criticality and global phase diagram of magnetic heavy fermions
  • Q. Si
  • Physics
  • 1 December 2009
Quantum criticality describes the collective fluctuations of matter undergoing a second-order phase transition at zero temperature. It is being discussed in a number of strongly correlated electronExpand
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TOPICAL REVIEW: How do Fermi liquids get heavy and die?
We discuss non-Fermi liquid and quantum critical behaviour in heavy-fermion materials, focusing on the mechanism by which the electron mass appears to diverge at the quantum critical point. We askExpand
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High Temperature Superconductivity in Iron Pnictides and Chalcogenides
Superconductivity develops in metals upon the formation of a coherent macroscopic quantum state of electron pairs. Iron pnictides and chalcogenides are materials that have high superconductingExpand
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