The stripe-liquid phase in cuprates and nickelates

2002 ◽  
Vol 12 (9) ◽  
pp. 239-244
Author(s):  
J. M. Tranquada
Keyword(s):  
Liquid Phase ◽  
Neutron Scattering ◽  
Infrared Absorption ◽  
Liquid State ◽  
Domain Walls ◽  
Charge Carriers ◽  
Mid Infrared ◽  
Gap States ◽  
Open Question ◽  
Antiferromagnetic Domains

It is well established that doped 2D antiferromagnets such as layered nickelates and certain cuprates can exhibit an ordered phase in which charge carriers are segregated to periodically-spaced domain walls separating antiferromagnetic domains. An open question concerns the nature of the state that is achieved when a stripe solid melts. Recent neutron scattering experiments on nickelates and cuprates indicate that melting leads to a stripe-liquid state; these results will be presented and discussed. The existence of the stripe-liquid phase in nickelates makes it plausible to interpret the mid-infrared absorption in terms of transitions from valence to mid-gap states associated with the stripes.

Behavior and Energy States of Photogenerated Charge Carriers on Pt- or CoOx-Loaded LaTiO2N Photocatalysts: Time-Resolved Visible to Mid-Infrared Absorption Study

2014 ◽  
Vol 118 (41) ◽  
pp. 23897-23906 ◽  
Author(s):  
Akira Yamakata ◽  
Masayuki Kawaguchi ◽  
Naoyuki Nishimura ◽  
Tsutomu Minegishi ◽  
Jun Kubota ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Charge Carriers ◽  
Absorption Study ◽  
Time Resolved ◽  
Mid Infrared ◽  
Energy States

Cobaltites as perspective thermoelectrics

2005 ◽  
Vol 886 ◽  
Author(s):  
Jiri Hejtmánek ◽  
Miroslav Veverka ◽  
Karel Knižek ◽  
Hiroyuki Fujishiro ◽  
Sylvie Hebert ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Phonon Scattering ◽  
Configurational Entropy ◽  
Energy Difference ◽  
Charge Carriers ◽  
Material Research ◽  
Cobalt Ions ◽  
Similar Materials ◽  
Physical Background ◽  
Open Question

AbstractThe recent material research of mixed cobalt oxides is strongly motivated by the potential of some of them to be used as chemically stable high temperature thermoelectric material. This fact together with both the theoretical and experimental ambitions to fulfill the severe criteria needed for efficient thermoelectric conversion intensified both their theoretical and experimental research. Nonetheless, despite the investigations of the prototype materials represented by 3D perovskites Ln1−xAxCoO3 (Ln = La, Y, rare-earth, A = alkaline-earth) and 2D cobaltites of NaxCoO2 type, the concise physical background of their transport and magnetic properties remain still a matter of debate. This is likely due to a fact that cobalt ions can be stabilized either in low-spin state (diamagnetic for “pure” Co3+), with filled t2g levels and empty eg states, or magnetic ones, with filled eg states. As the energy difference between respective states is due to comparable strength of crystal field and Hund's energies rather small, the thermodynamically most stable ground-state, with eventually different character of charge carriers, can be critically influenced by an interplay of additional degrees of freedom - orbital and charge. The challenge for unequivocal theoretical model represents the thermoelectric power of mixed cobaltites where, up to now, somewhat ambiguous models based either on “classical” approach, associated with diffusion of itinerant charge carriers, or more exotic - based on configurational entropy of quasi-itinerant carriers - are often used for similar materials. Simultaneously, the open question remains the assessment of the dominant mechanism of phonon scattering in 2D cobaltites.

scholarly journals Mid-infrared conductivity from mid-gap states associated with charge stripes

2003 ◽  
Vol 67 (18) ◽  
Author(s):  
C. C. Homes ◽  
J. M. Tranquada ◽  
Q. Li ◽  
A. R. Moodenbaugh ◽  
D. J. Buttrey
Keyword(s):  
Mid Infrared ◽  
Gap States

Mid-Infrared Photoluminescence from Liquid Phase Epitaxial InAs1-ySby/InAs Multilayers

1997 ◽  
Vol 36 (Part 1, No. 2) ◽  
pp. 738-742 ◽  
Author(s):  
XiuYing Gong ◽  
Tomuo Yamaguchi ◽  
Hirofumi Kan ◽  
Takamitsu Makino ◽  
Nelson L. Rowell ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Mid Infrared ◽  
Liquid Phase Epitaxial

scholarly journals Photogenerated Carriers in SrTiO3Probed by Mid-Infrared Absorption

2006 ◽  
Vol 75 (2) ◽  
pp. 023703 ◽  
Author(s):  
Hidekazu Okamura ◽  
Masato Matsubara ◽  
Koichiro Tanaka ◽  
Kazutoshi Fukui ◽  
Mitsushi Terakami ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Mid Infrared
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