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Ultrasonic Studies of the Jahn-Teller Effect in a Model System- [electronic resource]
![Ultrasonic Studies of the Jahn-Teller Effect in a Model System - [electronic resource]](/Users/Baul/Images/book.png)
Ultrasonic Studies of the Jahn-Teller Effect in a Model System- [electronic resource]
상세정보
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214100124
- ISBN
- 9798379712044
- DDC
- 530
- 서명/저자
- Ultrasonic Studies of the Jahn-Teller Effect in a Model System - [electronic resource]
- 발행사항
- [S.l.]: : Cornell University., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(163 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
- 주기사항
- Advisor: Ramshaw, Brad.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 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.
- 일반주제명
- Energy.
- 기타저자
- Cornell University Physics
- 기본자료저록
- Dissertations Abstracts International. 84-12B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520240214100124
■006m o d
■007cr#unu||||||||
■020 ▼a9798379712044
■035 ▼a(MiAaPQ)AAI30424833
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aHollister, Patrick Morgan, II.▼0(orcid)0000-0001-5800-9911
■24510▼aUltrasonic Studies of the Jahn-Teller Effect in a Model System▼h[electronic resource]
■260 ▼a[S.l.]:▼bCornell University. ▼c2023
■260 1▼aAnn Arbor :▼bProQuest Dissertations & Theses, ▼c2023
■300 ▼a1 online resource(163 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 84-12, Section: B.
■500 ▼aAdvisor: Ramshaw, Brad.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aThe 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.
■590 ▼aSchool code: 0058.
■650 4▼aCondensed matter physics.
■650 4▼aEnergy.
■653 ▼aJahn-Teller effect
■653 ▼aCrystalline systems
■653 ▼aCooperative version
■690 ▼a0611
■690 ▼a0791
■71020▼aCornell University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g84-12B.
■773 ▼tDissertation Abstract International
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16931827▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
