Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce1-xYbxCoIn5

Bibliographic Details
Main Author:	Haney, Derek J.
Language:	English
Published:	Kent State University / OhioLINK 2016
Subjects:	Physics Condensed Matter Physics Superconductor heavy fermion Kondo CeCoIn5 magnetoresistance magnetoresistivity quantum critical point coherence
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=kent1469054369

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-kent14690543692021-08-03T06:37:35Z Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub> Haney, Derek J. Physics Condensed Matter Physics Superconductor heavy fermion Kondo CeCoIn5 magnetoresistance magnetoresistivity quantum critical point coherence We performed magnetoresistivity measurements on samples of Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub> over a range of doping, temperature, field, and pressure. We were able to reveal information on the quantum critical nature of the system and on the relationship between the quantum critical fluctuations and the Kondo coherence of the system.At x = 0.07, the system is extremely close to a zero-field quantum critical point. Pressure is applied here to investigate the effect that it has on the physics of the material and to gain understanding as to the origin of its properties. It is revealed that the quantum fluctuations are related to the heavy quasiparticles and are weakened with pressure, although the quantum critical field is pressure-independent. A mysterious T<sup>1/2</sup> term in the low-temperature resistivity is shown to be due to scattering processes involving light electrons from a smaller Fermi surface.Further doping shows that the quantum critical point is suppressed to zero field at x = 0.09. Measurements at x = 0.16 show no evidence of quantum critical behavior.An in-depth analysis of the magnetoresistivity reveals two main components - one due to a coherence-related order formed within the system and one due to the formation of Kondo singlets behaving independently of each other at higher fields. Through these components, we are able to determine the Kondo temperature T<sub>K</sub> as a function of doping and pressure. Our measurements also indicate that T<sub>K</sub> and T<sub>coh</sub> are independent of each other. 2016-08-02 English text Kent State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=kent1469054369 http://rave.ohiolink.edu/etdc/view?acc_num=kent1469054369 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Physics Condensed Matter Physics Superconductor heavy fermion Kondo CeCoIn5 magnetoresistance magnetoresistivity quantum critical point coherence
spellingShingle	Physics Condensed Matter Physics Superconductor heavy fermion Kondo CeCoIn5 magnetoresistance magnetoresistivity quantum critical point coherence Haney, Derek J. Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub>
author	Haney, Derek J.
author_facet	Haney, Derek J.
author_sort	Haney, Derek J.
title	Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub>
title_short	Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub>
title_full	Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub>
title_fullStr	Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub>
title_full_unstemmed	Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub>
title_sort	magnetoresistivity and quantum criticality in heavy fermion superconductor ce<sub>1-x</sub>yb<sub>x</sub>coin<sub>5</sub>
publisher	Kent State University / OhioLINK
publishDate	2016
url	http://rave.ohiolink.edu/etdc/view?acc_num=kent1469054369
work_keys_str_mv	AT haneyderekj magnetoresistivityandquantumcriticalityinheavyfermionsuperconductorcesub1xsubybsubxsubcoinsub5sub
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Magnetoresistivity and Quantum Criticality in Heavy Fermion Superconductor Ce<sub>1-x</sub>Yb<sub>x</sub>CoIn<sub>5</sub>

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