scholarly journals ANOMALOUS LOCAL CRITICALITY IN HEAVY FERMION METALS FROM HOLOGRAPHY

2013 ◽  
Vol 28 (01) ◽  
pp. 1450005 ◽  
Author(s):  
M. J. LUO
Keyword(s):  
Fixed Point ◽  
Critical Exponent ◽  
Critical Point ◽  
Spin Density ◽  
Heavy Fermion ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Spin Density Wave ◽  
Quantum Critical ◽  
Non Gaussian

In this paper, we propose a holographic theory to explain a number of anomalous critical phenomena observed in certain heavy fermion metals, e.g. CeCu 5.9 Au 0.1 and YbRh 2( Si 0.95 Ge 0.05)2, which are incompatible with any conventional spin-density-wave quantum critical point theory. We show that the non-Gaussian nature of the fixed point from holography plays an essential role in the physics of these materials near a quantum critical point, which is not in the same universality class of the spin-density-wave type fixed point. The critical spin fluctuations at the non-Gaussian fixed point are strongly anisotropic, localized in spatial directions and critical in temporal direction with critical exponent 2/3 in frequency over temperature dependence at low temperature. The local critical exponent tends to unity which leads to a constant spin relaxation rate in the quantum critical regime at high temperature. The stability of the fixed point is also discussed.

scholarly journals Ultrasmall Moment Incommensurate Spin Density Wave Order Masking a Ferromagnetic Quantum Critical Point in NbFe2

2019 ◽  
Vol 123 (24) ◽  
Author(s):  
P. G. Niklowitz ◽  
M. Hirschberger ◽  
M. Lucas ◽  
P. Cermak ◽  
A. Schneidewind ◽  
...  
Keyword(s):  
Critical Point ◽  
Spin Density ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Spin Density Wave ◽  
Quantum Critical

DOES THE HEAVY ELECTRON MAINTAIN ITS INTEGRITY AT QUANTUM CRITICAL POINT?

2002 ◽  
Vol 16 (20n22) ◽  
pp. 2991-2991
Author(s):  
P. COLEMAN
Keyword(s):  
Critical Point ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Spin Density Wave ◽  
Electron Mass ◽  
Heavy Electron ◽  
Heavy Fermion Materials ◽  
Quantum Critical ◽  
Composite Nature ◽  
Quantum Critical Behavior

This talk will discuss non-Fermi liquid and quantum critical behavior in heavy fermion materials, focussing on the mechanism by which the electron mass appears to diverge at the quantum critical point. Is the quantum critical point merely a case of electron diffraction off a quantum critical spin density wave, or does it involve a fundamental break-down in the composite nature of the heavy electron place at the quantum critical point? We discuss the nature of the critical langrangian and show that the Hall constant changes continuously in the first scenario, but may "jump" discontinuously at a quantum critical point where the composite character of the electron quasiparticles changes.

scholarly journals Competing magnetic orders in the superconducting state of heavy-fermion CeRhIn5

2017 ◽  
Vol 114 (21) ◽  
pp. 5384-5388 ◽  
Author(s):  
P. F. S. Rosa ◽  
J. Kang ◽  
Yongkang Luo ◽  
N. Wakeham ◽  
E. D. Bauer ◽  
...  
Keyword(s):  
Spin Density ◽  
Superconducting State ◽  
Heavy Fermion ◽  
Magnetic State ◽  
Applied Pressure ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Spin Density Wave ◽  
Zero Field ◽  
Model Calculations

Applied pressure drives the heavy-fermion antiferromagnet CeRhIn5 toward a quantum critical point that becomes hidden by a dome of unconventional superconductivity. Magnetic fields suppress this superconducting dome, unveiling the quantum phase transition of local character. Here, we show that 5% magnetic substitution at the Ce site in CeRhIn5, either by Nd or Gd, induces a zero-field magnetic instability inside the superconducting state. This magnetic state not only should have a different ordering vector than the high-field local-moment magnetic state, but it also competes with the latter, suggesting that a spin-density-wave phase is stabilized in zero field by Nd and Gd impurities, similarly to the case of Ce0.95Nd0.05CoIn5. Supported by model calculations, we attribute this spin-density wave instability to a magnetic-impurity-driven condensation of the spin excitons that form inside the unconventional superconducting state.

scholarly journals Tuning the charge density wave quantum critical point and the appearance of superconductivity in TiSe2

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Sangyun Lee ◽  
Tae Beom Park ◽  
Jihyun Kim ◽  
Soon-Gil Jung ◽  
Won Kyung Seong ◽  
...  
Keyword(s):  
Charge Density ◽  
Critical Point ◽  
Charge Density Wave ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Quantum Critical

scholarly journals Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe 3− x Se x

2016 ◽  
Vol 25 (7) ◽  
pp. 077403
Author(s):  
Shan Cui ◽  
Lan-Po He ◽  
Xiao-Chen Hong ◽  
Xiang-De Zhu ◽  
Cedomir Petrovic ◽  
...  
Keyword(s):  
Charge Density ◽  
Critical Point ◽  
Charge Density Wave ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Quantum Critical

The charge-density-wave quantum-critical-point scenario

1997 ◽  
Vol 282-287 ◽  
pp. 260-263 ◽  
Author(s):  
C. Castellani ◽  
C. Di Castro ◽  
M. Grilli
Keyword(s):  
Charge Density ◽  
Critical Point ◽  
Charge Density Wave ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Quantum Critical

scholarly journals Coincident onset of charge-density-wave order at a quantum critical point in underdoped YBa2Cu3Ox

2018 ◽  
Vol 97 (22) ◽  
Author(s):  
H. Jang ◽  
W.-S. Lee ◽  
S. Song ◽  
H. Nojiri ◽  
S. Matsuzawa ◽  
...  
Keyword(s):  
Charge Density ◽  
Critical Point ◽  
Charge Density Wave ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Quantum Critical
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