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Optical study of pressure-induced insulator-to-metal transitions in correlated electron systems

Published online by Cambridge University Press:  01 November 2010

A. Perucchi ,
L. Baldassarre ,
C. Marini ,
P. Postorino  and
S. Lupi
A. Perucchi*
Affiliation:
Sincrotrone Trieste, Area Science Park, I-34012 Trieste, Italy
L. Baldassarre
Affiliation:
Sincrotrone Trieste, Area Science Park, I-34012 Trieste, Italy
C. Marini
Affiliation:
CNR-IOM TASC and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Rome, Italy
P. Postorino
Affiliation:
CNR-IOM TASC and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Rome, Italy
S. Lupi
Affiliation:
CNR-IOM TASC and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Rome, Italy
*
†Email address for correspondence:andrea.perucchi@elettra.trieste.it
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Abstract

Understanding the physics of strongly correlated systems is one of the most challenging tasks of condensed matter research. Besides displaying extremely interesting physical behaviour, their sensitivity to small changes in external parameters makes them highly appealing for future technological applications. That sensitivity is attributed to the small value of the electron bandwidth W in comparison with other relevant energy scales such as the electron correlation U or the charge transfer (CT) energy gap Δ. While being a challenging experimental technique, the application of high pressure (HP) through a diamond anvil cell (DAC) permits to tune the bandwidth W continuously and without introducing impurities or disorder. Because of the small throughput of DACs, infrared (IR) measurements at HP take great advantage of the use of a high-brightness source as a synchrotron IR source (Lupi et al. 2007). We review here our latest results on several correlated insulators of the Mott–Hubbard and CT type.

Type
Contributed paper
Information
Diamond Light Source Proceedings , Volume 1 , Issue SRMS-7 , October 2010 , e117
Copyright
Copyright © Diamond Light Source Ltd 2010

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References

REFERENCES

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