scholarly journals Studies of Correlated-Electron Systems in High Magnetic Fields and at High Pressures

2008 ◽  
Author(s):  
Dr. Andrew Cornelius
Keyword(s):  
Magnetic Fields ◽  
High Pressures ◽  
High Magnetic Fields ◽  
Electron Systems ◽  
Correlated Electron Systems ◽  
Correlated Electron

Uranium (and Cerium) Compounds At High Pressures and Magnetic Fields

2003 ◽  
Vol 802 ◽  
Author(s):  
Andrew L. Cornelius ◽  
Ravhi S. Kumar ◽  
Brian E. Light
Keyword(s):  
Magnetic Fields ◽  
Heavy Fermion ◽  
High Pressures ◽  
Direct Result ◽  
Strong Interactions ◽  
High Magnetic Fields ◽  
Electron Systems ◽  
Correlated Electron Systems ◽  
Range Magnetic Order ◽  
Correlated Electron

ABSTRACTCorrelated-electron systems are so named due to strong interactions between electrons unlike traditional metals (e.g. copper) that have “free electrons” that interact very weakly. Knowledge of the Fermi surface, density of electron states and band structure are the starting points for a first-principles understanding of the electronic and electronically related macroscopic properties, e.g. equation of state. The use of high pressure and high magnetic fields to alter the electron-electron (hybridization) and electron-lattice interactions give us powerful tools to understand complicated rare earth and actinide correlated-electron systems and allows precise testing of experiment to theory. Correlated-electron systems yield a wide variety of ground states that are a direct result of the hybridization strength including: short and long range magnetic order, spin fluctuating, enhanced Pauli paramagnetism, heavy fermion behavior and superconductivity. We will review some results on U compounds in high magnetic fields and high pressures. By comparing the results to Ce compounds that have significantly more localized f electrons, the effect of direct 5f electron wavefunction overlap in U compounds can be discerned. Consequences on the search for U based heavy fermion superconductors will be discussed.

High Pressure Materials Physics Research at UNLV

2014 ◽  
Vol 783-786 ◽  
pp. 1836-1838
Author(s):  
Andrew L. Cornelius ◽  
Brant Abeln ◽  
Daniel Antonio ◽  
Jason Baker ◽  
Patricia E. Kalita ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressures ◽  
Ambient Pressure ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
High Pressure Studies ◽  
Heat Capacity Measurements

High-pressure studies on strongly correlated-electron systems allow the study of the relationship between structural, elastic, electronic, and magnetic properties of d-and f-band systems. The High Pressure Science and Engineering Center (HiPSEC) at UNLV performs interdisciplinary research on a wide variety of materials at high pressures. One such system, YbB2 displays antiferromagnet order at ambient pressure. We present heat capacity measurements at high magnetic fields to 9 T and structural measurement at pressures up to 5 GPa on YbB2.

EXACTNESS OF FERMIONIC LINEARIZATION SCHEME WITH CLIFFORD VARIABLES IN d=∞

1995 ◽  
Vol 09 (16) ◽  
pp. 971-975 ◽  
Author(s):  
ARIANNA MONTORSI
Keyword(s):  
Exact Solution ◽  
Single Site ◽  
Strongly Correlated Electron Systems ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron

We show that the fermionic linearization scheme for dealing with strongly correlated electron systems — when implemented with Clifford variables — becomes exact in the d=∞ limit, at least for Hubbard-like models. In this case, the model is mapped exactly into a single-site problem. The conditions under which such a feature allows to obtain an exact solution are also discussed.

Sign in / Sign up

Export Citation Format

Share Document