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Magnetic fluctuations and clusters in the itinerant ferromagnet Ni-V close to a disordered quantum critical point

Wang, Ruizhe
http://orcid.org/0000-0003-3518-2759
http://rave.ohiolink.edu/etdc/view?acc_num=kent1555936445433091

Abstract Details

2019, PHD, Kent State University, College of Arts and Sciences / Department of Physics.
The study of quantum phase transitions (QPT) is a promising route to comprehend the origin of unconventional properties in strongly correlated electron systems. Recent theories predict a new quantum critical point (QCP) in disordered itinerant system with exotic properties such as observable quantum Griffiths phase (QGP). The binary alloy Ni-V presents such QGP and looks like the best example to study a ferromagnetic QPT with controlled disorder. In this work, we investigate further Ni-V with advanced local methods using neutron scattering and μSR techniques. Initial doubts on sample quality and sample-dependent impact on different magnetic phases and disordered scenarios can be resolved. A structural characterization indicates that the investigated Ni-V samples show a high-quality chemical structure with expected random atomic distribution. We provide direct evidence of the "disorder" with μSR methods. We clarify essential details of the Ni-V phase diagram such as the nature and the boundaries of ferromagnetic and cluster glass phases. These new data reinforce the location of the QCP and the limits of the QGP in Ni-V. The main results are consistent with theories predicting an infinite randomness quantum critical point associated with a QGP.
Almut Schroeder, PhD (Committee Chair)
Carmen C. Almasan, PhD (Committee Member)
Maxim Dzero, PhD (Committee Member)
Songping Huang, PhD (Committee Member)
Michael Tubergen, PhD (Committee Member)
132 p.
Condensed Matter Physics; Experiments; Physics
quantum phase transition; quantum Griffiths phase; infinite randomness quantum critical point; muon spin rotation; atomic pair correlation; ferromagnetic system; magnetic fluctuation; magnetic cluster

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Citations

  • Wang, R. (2019). Magnetic fluctuations and clusters in the itinerant ferromagnet Ni-V close to a disordered quantum critical point [Doctoral dissertation, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent1555936445433091

    APA Style (7th edition)

  • Wang, Ruizhe. Magnetic fluctuations and clusters in the itinerant ferromagnet Ni-V close to a disordered quantum critical point. 2019. Kent State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=kent1555936445433091.

    MLA Style (8th edition)

  • Wang, Ruizhe. "Magnetic fluctuations and clusters in the itinerant ferromagnet Ni-V close to a disordered quantum critical point." Doctoral dissertation, Kent State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1555936445433091

    Chicago Manual of Style (17th edition)

kent1555936445433091
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© 2019, some rights reserved.Creative Commons License Magnetic fluctuations and clusters in the itinerant ferromagnet Ni-V close to a disordered quantum critical point by Ruizhe Wang is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Kent State University and OhioLINK.