scholarly journals Identification of the low-energy excitations in a quantum critical system

AIP Advances ◽  
2016 ◽  
Vol 7 (5) ◽  
pp. 055701 ◽  
Author(s):  
Tom Heitmann ◽  
Jagat Lamsal ◽  
Shannon Watson ◽  
Ross Erwin ◽  
Wangchun Chen ◽  
...  
Keyword(s):  
Low Energy ◽  
Critical System ◽  
Quantum Critical

scholarly journals Lattice-shifted nematic quantum critical point in FeSe1−xSx

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
S. Chibani ◽  
D. Farina ◽  
P. Massat ◽  
M. Cazayous ◽  
A. Sacuto ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Critical Point ◽  
Degrees Of Freedom ◽  
Quantum Critical Point ◽  
Substantial Effect ◽  
Low Energy ◽  
Elastic Coupling ◽  
Superconducting Transition ◽  
Local Moments ◽  
Quantum Critical

AbstractWe report the evolution of nematic fluctuations in FeSe1−xSx single crystals as a function of Sulfur content x across the nematic quantum critical point (QCP) xc ~ 0.17 via Raman scattering. The Raman spectra in the B1g nematic channel consist of two components, but only the low energy one displays clear fingerprints of critical behavior and is attributed to itinerant carriers. Curie–Weiss analysis of the associated nematic susceptibility indicates a substantial effect of nemato-elastic coupling, which shifts the location of the nematic QCP. We argue that this lattice-induced shift likely explains the absence of any enhancement of the superconducting transition temperature at the QCP. The presence of two components in the nematic fluctuations spectrum is attributed to the dual aspect of electronic degrees of freedom in Hund’s metals, with both itinerant carriers and local moments contributing to the nematic susceptibility.

Static and dynamic susceptibility in the putative ferromagnetic quantum critical system YbNi4 P2 probed by 31 P NMR

2013 ◽  
Vol 250 (3) ◽  
pp. 519-521 ◽  
Author(s):  
Rajib Sarkar ◽  
Panchanan Khuntia ◽  
Johannes Spehling ◽  
Cornelius Krellner ◽  
Christoph Geibel ◽  
...  
Keyword(s):  
Dynamic Susceptibility ◽  
Critical System ◽  
Quantum Critical

scholarly journals Phase diagram of quantum critical system via local convertibility of ground state

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Si-Yuan Liu ◽  
Quan Quan ◽  
Jin-Jun Chen ◽  
Yu-Ran Zhang ◽  
Wen-Li Yang ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Ground State ◽  
Critical System ◽  
Quantum Critical

Ground state of a quantum critical system: Neutron scattering onCe(Ru1−xFex)2Ge2

2007 ◽  
Vol 76 (5) ◽  
Author(s):  
Wouter Montfrooij ◽  
Jagat Lamsal ◽  
Meigan Aronson ◽  
Marcus Bennett ◽  
Anne de Visser ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Ground State ◽  
Critical System ◽  
Quantum Critical

PSEUDOGAP IN CUPRATE SUPERCONDUCTORS: EXPLORING SCALING AND QUANTUM CRITICAL END POINT

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3202-3207 ◽  
Author(s):  
L. KRUSIN-ELBAUM ◽  
T. SHIBAUCHI
Keyword(s):  
Cuprate Superconductors ◽  
Quantum Critical Point ◽  
Low Energy ◽  
High Magnetic Fields ◽  
Zeeman Energy ◽  
Spin Singlet ◽  
Quantum Critical ◽  
Universal Correlation ◽  
Doping Type

We explore extremely overdoped regime in the phase diagram of cuprate superconductors. Interlayer tunneling transport measurements under high magnetic fields are employed to detect the field dependence of low-energy density of states (DOS) in hole-doped (BSCCO and TBCO), and electron-doped (SCCO) cuprates. We find a strong doping dependence of the pseudogap closing field whose Zeeman energy universally scales with the pseudogap onset temperature, indicating a preeminent role of spin-singlet correlations in forming the pseudogap regardless of the doping type. Excess dissipation due to the pseudogap is found to follow a 'universal' correlation with the pseudogap closing field. The pseudogap features appear absent in the extremely overdoped TBCO, pointing to a possible quantum critical point very near the edge of the superconducting 'dome'.

scholarly journals Adiabatic dynamics of a quantum critical system coupled to an environment: Scaling and kinetic equation approaches

2009 ◽  
Vol 80 (2) ◽  
Author(s):  
Dario Patanè ◽  
Luigi Amico ◽  
Alessandro Silva ◽  
Rosario Fazio ◽  
Giuseppe E. Santoro
Keyword(s):  
Kinetic Equation ◽  
Critical System ◽  
Adiabatic Dynamics ◽  
Quantum Critical
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