Thermodynamic approach to obtaining a highly spin-polarized strongly correlated Fermi liquid in solid-state systems

2005 ◽  
Vol 72 (11) ◽  
Author(s):  
Mucio A. Continentino
Keyword(s):  
Solid State ◽  
Fermi Liquid ◽  
Thermodynamic Approach ◽  
Strongly Correlated ◽  
Spin Polarized

Retrograde reactions involving galena and Ag-sulphosalts in a zoned ore deposit, Julcani, Peru

2002 ◽  
Vol 66 (6) ◽  
pp. 1043-1062 ◽  
Author(s):  
R. O. Sack ◽  
P. C. Goodell
Keyword(s):  
Solid State ◽  
Phase Equilibria ◽  
Exchange Reaction ◽  
Strong Evidence ◽  
Mining District ◽  
Strongly Correlated ◽  
Ore Deposit ◽  
Hydrothermal Mineralization ◽  
Sulphide Ores ◽  
Mineral Compositions

Abstract The sulphide ores from the Julcani mining district (Peru) display many retrograde reactions that may be attributed to solid-state processes accompanying cooling. Fahlores [˜(Cu,Ag)10(Zn,Fe)2(Sb,As)4S13] from the Herminia mine exhibit pronounced downstream enrichments in molar Ag/(Ag+Cu) ratios that are strongly correlated with the abundance of PbS-AgSbS2-AgBiS2 phases. These correlations, discontinuous core to rim Sb/(Sb+As) enrichments in bournonites, and prominent reaction textures involving fahlores, bournonites and galenas provide strong evidence that the fahlores in these ores have been enriched in Ag by the Ag–Cu exchange reaction which occurred during cooling following mineralization of a PbS-AgSbS2-AgBiS2 galena and has been documented elsewhere. Secondary PbS-AgSbS2-AgBiS2 minerals aramayoite, bismuthian diaphorite [Pb2Ag3(Bi,Sb)3S8], and diaphorite were produced from primary galenas with cooling of ores with high Pb/Cu and Bi/Sb; pyrargyrite formed from the breakdown of the Ag10Zn2Sb4S13 component in the most Ag-rich fahlores, as an exsolution product of galena, and from replacement of aramayoite and galena with the evolution of semimetal sulphides. Based on mineral compositions, phase equilibria, a thermochemical database for sulphides and sulphosalts, and the reintegrated composition for primary grains of Ag-rich PbS-AgSbS2-AgBiS2 phases, we estimate that the primary temperature of hydrothermal mineralization was >320±10°C, that these reactions ceased to affect fahlore Ag/(Ag+Cu) ratios and Bi/(Bi+Sb) ratios of aramayoite and miargyrite after cooling through 220±10°C. Galenas, however, appear to have continued to adjust their compositions to reflect even lower temperatures by continued exsolution of semimetals and production a diverse suite of sulphosalts that occur in fine intergrowths with galena.

scholarly journals Tuning bad metal and non-Fermi liquid behavior in a Mott material: Rare-earth nickelate thin films

2015 ◽  
Vol 1 (10) ◽  
pp. e1500797 ◽  
Author(s):  
Evgeny Mikheev ◽  
Adam J. Hauser ◽  
Burak Himmetoglu ◽  
Nelson E. Moreno ◽  
Anderson Janotti ◽  
...  
Keyword(s):  
Fermi Liquid ◽  
Epitaxial Films ◽  
Strongly Correlated ◽  
Complex Phase ◽  
Strongly Correlated Materials ◽  
Liquid Phases ◽  
Liquid Behavior ◽  
Novel Devices ◽  
Shed Light ◽  
Fermi Liquid Behavior

Resistances that exceed the Mott-Ioffe-Regel limit (known as bad metal behavior) and non-Fermi liquid behavior are ubiquitous features of the normal state of many strongly correlated materials. We establish the conditions that lead to bad metal and non-Fermi liquid phases in NdNiO3, which exhibits a prototype bandwidth-controlled metal-insulator transition. We show that resistance saturation is determined by the magnitude of Ni egorbital splitting, which can be tuned by strain in epitaxial films, causing the appearance of bad metal behavior under certain conditions. The results shed light on the nature of a crossover to a non-Fermi liquid metal phase and provide a predictive criterion for Anderson localization. They elucidate a seemingly complex phase behavior as a function of film strain and confinement and provide guidelines for orbital engineering and novel devices.

Non fermi liquid behavior in strongly correlated f-electron materials

1994 ◽  
Vol 95 (1-2) ◽  
pp. 225-243 ◽  
Author(s):  
M. B. Maple ◽  
C. L. Seaman ◽  
D. A. Gajewski ◽  
Y. Dalichaouch ◽  
V. B. Barbetta ◽  
...  
Keyword(s):  
Fermi Liquid ◽  
Strongly Correlated ◽  
Liquid Behavior ◽  
Fermi Liquid Behavior
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