자료유형  

 학위논문

Control Number  

0016931827

International Standard Book Number  

9798379712044

Dewey Decimal Classification Number  

530

Main Entry-Personal Name  

Hollister, Patrick Morgan, II.

Publication, Distribution, etc. (Imprint  

[S.l.] : Cornell University., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(163 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 84-12, Section: B.

General Note  

Advisor: Ramshaw, Brad.

Dissertation Note  

Thesis (Ph.D.)--Cornell University, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약The Jahn-Teller effect occurs when degenerate atomic levels lower their energy by distorting and therefore lowering the symmetry of the system. This effect occurs in a range of molecular and crystalline systems, but here we focus on one in particular, the crystal series TmxY1−xVO4. The x = 1 member of this series was studied extensively in the 1970's and 1980's as a paradigmatic example of the cooperative version of the Jahn-Teller effect. In this material, Jahn-Teller-susceptible energy levels on the Tm3+ ions interact with each other to drive a phase transition at T = 2.15 K. On the dilute end of the series, for x 1, Tm3+ ions replace yttrium at such a low density that they are unable to interact with each other and therefore act as though they are isolated.In this thesis, we examine both the cooperative and isolated Jahn-Teller effect as well as the regions in between where neither paradigm is completely true. We first use ultrasound-driven transitions between localized 4f levels to study the microscopic environment of isolated Jahn-Teller ions. We then present ultrasonic measurements of the speed of sound across this material series and show how we can use this data to extract an effective interaction distance between Jahn-Teller ions. Finally, we examine the formation of Jahn-Teller strains at both the isolated and the cooperative ends of the series.

Subject Added Entry-Topical Term  

Condensed matter physics.

Subject Added Entry-Topical Term  

Energy.

Index Term-Uncontrolled  

Jahn-Teller effect

Index Term-Uncontrolled  

Crystalline systems

Index Term-Uncontrolled  

Cooperative version

Added Entry-Corporate Name  

Cornell University Physics

Host Item Entry  

Dissertations Abstracts International. 84-12B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:640293