Related Experiment Videos
Non-Fermi-liquid spin dynamics in CeCoGe3-xSi(x) for x = 1.2 and 1.5
V V Krishnamurthy1, K Nagamine, I Watanabe
1The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan.
Physical Review Letters
|January 22, 2002
Summary
Muon spin relaxation studies reveal non-Fermi-liquid spin dynamics in CeCoGe3-xSi(x) alloys near magnetic transitions. These findings shed light on Griffiths phase formation and quantum critical behavior.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- Cerium-based intermetallic compounds like CeCoGe3-xSi(x) are crucial for studying quantum phase transitions.
- Understanding the interplay between magnetic order and non-Fermi-liquid behavior is key to exploring novel electronic states.
Purpose of the Study:
- To investigate the magnetic properties and spin dynamics of CeCoGe3-xSi(x) alloys at the magnetic/nonmagnetic boundary.
- To characterize the non-Fermi-liquid (NFL) spin dynamics and identify the formation of Griffiths phases.
Main Methods:
- Muon spin relaxation (μSR) spectroscopy was employed to probe magnetic ordering and spin dynamics.
- Measurements were conducted on CeCoGe3-xSi(x) alloys at specific compositions (x = 1.2 and x = 1.5) near their magnetic phase transitions.
Main Results:
- At x = 1.2, short-range magnetic ordering was observed below 0.86 K, with the disordered region exhibiting NFL spin dynamics (λ₂ ∝ T⁰.⁷²), indicative of Griffiths phase formation.
- At x = 1.5, logarithmic NFL scaling of λ₂ below 1 K was observed, consistent with a T = 0 K magnetic transition.
Conclusions:
- The study demonstrates the presence of both ordered and disordered magnetic regions in CeCoGe3-xSi(x) alloys.
- The observed non-Fermi-liquid spin dynamics provide evidence for Griffiths phase formation and quantum critical behavior at the magnetic phase boundary.