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Kondo destruction in heavy fermion quantum criticality and the photoemission spectrum of YbRh2Si2
- Source :
- Paschen, S, Friedemann, S, Wirth, S, Steglich, F, Kirchner, S & Si, Q 2016, ' Kondo destruction in heavy fermion quantum criticality and the photoemission spectrum of YbRh 2 Si 2 ', Journal of Magnetism and Magnetic Materials, vol. 400, pp. 17-22 . https://doi.org/10.1016/j.jmmm.2015.09.008
- Publication Year :
- 2016
-
Abstract
- Heavy fermion metals provide a prototype setting to study quantum criticality. Experimentally, quantum critical points have been identified and studied in a growing list of heavy fermion compounds. Theoretically, Kondo destruction has provided a means to characterize a class of unconventional quantum critical points that goes beyond the Landau framework of order-parameter fluctuations. Among the prominent evidence for such local quantum criticality have been measurements in YbRh$_2$Si$_2$. A rapid crossover is observed at finite temperatures in the isothermal field dependence of the Hall coefficient and other transport and thermodynamic quantities, which specifies a $T^*(B)$ line in the temperature ($T$)-magnetic field ($B$) phase diagram. Here, we discuss what happens when temperature is raised, by analyzing the ratio of the crossover width to the crossover position. With this ratio approaching unity at $T \gtrsim 0.5$ K, YbRh$_2$Si$_2$ at zero magnetic field belongs to the quantum-critical fluctuation regime, where the single-particle spectral function has significant spectral weight at both the small and large Fermi surfaces. This implies that, in this temperature range, any measurements sensitive to the Fermi surface will also see a significant spectral weight at the large Fermi surface. The angle-resolved photoemission spectroscopy (ARPES) experiments recently reported for YbRh$_2$Si$_2$ at $T>1$ K are consistent with this expectation, and therefore support the association of the $T^*(B)$ line with the physics of Kondo destruction.<br />submitted to proceedings of ICM15
- Subjects :
- Field (physics)
FOS: Physical sciences
Angle-resolved photoemission spectroscopy
02 engineering and technology
7. Clean energy
01 natural sciences
Quantum criticality
Condensed Matter - Strongly Correlated Electrons
Kondo destruction
Hall effect
Quantum mechanics
0103 physical sciences
010306 general physics
Quantum
Phase diagram
Physics
Condensed matter physics
Strongly Correlated Electrons (cond-mat.str-el)
Fermi surface
021001 nanoscience & nanotechnology
Condensed Matter Physics
ARPES
Electronic, Optical and Magnetic Materials
Magnetic field
Heavy fermion metals
Kondo effect
0210 nano-technology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Paschen, S, Friedemann, S, Wirth, S, Steglich, F, Kirchner, S & Si, Q 2016, ' Kondo destruction in heavy fermion quantum criticality and the photoemission spectrum of YbRh 2 Si 2 ', Journal of Magnetism and Magnetic Materials, vol. 400, pp. 17-22 . https://doi.org/10.1016/j.jmmm.2015.09.008
- Accession number :
- edsair.doi.dedup.....8a0507c5fd3549bb114ec67e9d67f5c3