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Title: Raman Spectroscopy of Pnictide and other Unconventional Superconductors

Abstract

Coupling between electrons in “strongly correlated materials” is associated with many scientifically important and technologically useful phenomena, including unconventional superconductivity, charge, spin or orbital ordered states. Understanding the behavior of novel superconductors presents a great intellectual challenge and is critical to developing new technologies. This work included spectroscopic studies of (1) unconventional superconductors with competing ground states, (2) recently discovered and technologically important superconductors from the iron-pnictide family which demonstrate high transition temperature and high critical fields, and (3) heavy fermion materials which demonstrate exotic ground states. This project involved investigation of the manner in which charge, spin, orbital and lattice coupling and dynamics evolve through various low temperature and magnetic- field phases of “strongly correlated materials” by employing electronic Raman scattering spectroscopy, and to clarify the microscopic origin of collective behavior like unconventional superconductivity induced in these compounds by electron correlations. The results of this study include (i) the elucidation of the microscopic origin of superconductivity in the iron-pnictide family of materials, including the evaluation of the role of electronic correlations in both normal and superconducting states, the role of proximity to a magnetically ordered state, the mechanisms of formation of the superconducting order parameter and its symmetry; (ii)more » insights into how to design new materials with enhanced superconducting properties; and (iii) determination of a complete spectrum of collective excitation in superconductors and in heavy fermion materials with “Hidden Orders”. The project enabled to support and train students and postdocs.« less

Authors:
Publication Date:
Research Org.:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1561519
Report Number(s):
DOE-Rutgers-SC0005463
DOE Contract Number:  
SC0005463
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Superconductivity, Strongly Correlated Electrons, Heavy Fermions.

Citation Formats

Blumberg, Girsh. Raman Spectroscopy of Pnictide and other Unconventional Superconductors. United States: N. p., 2018. Web. doi:10.2172/1561519.
Blumberg, Girsh. Raman Spectroscopy of Pnictide and other Unconventional Superconductors. United States. doi:10.2172/1561519.
Blumberg, Girsh. Wed . "Raman Spectroscopy of Pnictide and other Unconventional Superconductors". United States. doi:10.2172/1561519. https://www.osti.gov/servlets/purl/1561519.
@article{osti_1561519,
title = {Raman Spectroscopy of Pnictide and other Unconventional Superconductors},
author = {Blumberg, Girsh},
abstractNote = {Coupling between electrons in “strongly correlated materials” is associated with many scientifically important and technologically useful phenomena, including unconventional superconductivity, charge, spin or orbital ordered states. Understanding the behavior of novel superconductors presents a great intellectual challenge and is critical to developing new technologies. This work included spectroscopic studies of (1) unconventional superconductors with competing ground states, (2) recently discovered and technologically important superconductors from the iron-pnictide family which demonstrate high transition temperature and high critical fields, and (3) heavy fermion materials which demonstrate exotic ground states. This project involved investigation of the manner in which charge, spin, orbital and lattice coupling and dynamics evolve through various low temperature and magnetic- field phases of “strongly correlated materials” by employing electronic Raman scattering spectroscopy, and to clarify the microscopic origin of collective behavior like unconventional superconductivity induced in these compounds by electron correlations. The results of this study include (i) the elucidation of the microscopic origin of superconductivity in the iron-pnictide family of materials, including the evaluation of the role of electronic correlations in both normal and superconducting states, the role of proximity to a magnetically ordered state, the mechanisms of formation of the superconducting order parameter and its symmetry; (ii) insights into how to design new materials with enhanced superconducting properties; and (iii) determination of a complete spectrum of collective excitation in superconductors and in heavy fermion materials with “Hidden Orders”. The project enabled to support and train students and postdocs.},
doi = {10.2172/1561519},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {8}
}

Works referenced in this record:

Analogy Between the “Hidden Order” and the Orbital Antiferromagnetism in URu 2 x Fe x Si 2
journal, November 2016


Chirality density wave of the "hidden order" phase in URu2Si2
journal, February 2015


Critical quadrupole fluctuations and collective modes in iron pnictide superconductors
journal, February 2016