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Cutting Through the Noise in Quantum Materials With Ultrasound
Cutting Through the Noise in Quantum Materials With Ultrasound
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151938
- ISBN
- 9798384047834
- DDC
- 530
- 저자명
- Theuss, Florian.
- 서명/저자
- Cutting Through the Noise in Quantum Materials With Ultrasound
- 발행사항
- [Sl] : Cornell University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 252 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Ramshaw, Brad.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2024.
- 초록/해제
- 요약Strong interactions between electrons are the foundation of a myriad of exciting phenomena in condensed matter physics. In this thesis, we investigated two such cases- topological antiferromagnetism in Mn3X (X = Ge, Sn), and unconventional superconductivity in UTe2-by measuring their elastic moduli via the resonant ultrasound spectroscopy and pulse-echo ultrasound techniques.Our measurements in Mn3X find exceptionally large magnetoelastic coupling in the high-temperature antiferromagnetic state in both compounds, indicated by large derivatives of the Neel temperature with respect to hydrostatic pressure: (39 ± 3) K/GPa in Mn3Ge and (14.3 ± 2.0) K/GPa in Mn3Sn. Our measurements also helped identify the antiferomagnetic phase in these compounds as a piezomagnetic phase, rare behavior in which the total magnetization depends linearly on applied strain.From our pulse-echo ultrasound measurements in UTe2, we conclude that its superconducting order parameter has only one component which is the same between samples showing one and two superconducting transitions. Our data further suggests that the order parameter transforms as the B2u irreducible representation of the D2h point group. Comparing RUS and pulse-echo ultrasound data, as well as considering high-energy X-ray diffraction microscopy data, we speculate that the origin of the two transitions seen in some samples of UTe2 is due to structural inhomogeneity in these samples.
- 일반주제명
- Condensed matter physics
- 일반주제명
- Low temperature physics
- 일반주제명
- Thermodynamics
- 키워드
- Magnetism
- 키워드
- Ultrasound data
- 기타저자
- Cornell University Physics
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151938
■006m o d
■007cr#unu||||||||
■020 ▼a9798384047834
■035 ▼a(MiAaPQ)AAI31301887
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aTheuss, Florian.▼0(orcid)0000-0002-7996-8510
■24510▼aCutting Through the Noise in Quantum Materials With Ultrasound
■260 ▼a[Sl]▼bCornell University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a252 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Ramshaw, Brad.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2024.
■520 ▼aStrong interactions between electrons are the foundation of a myriad of exciting phenomena in condensed matter physics. In this thesis, we investigated two such cases- topological antiferromagnetism in Mn3X (X = Ge, Sn), and unconventional superconductivity in UTe2-by measuring their elastic moduli via the resonant ultrasound spectroscopy and pulse-echo ultrasound techniques.Our measurements in Mn3X find exceptionally large magnetoelastic coupling in the high-temperature antiferromagnetic state in both compounds, indicated by large derivatives of the Neel temperature with respect to hydrostatic pressure: (39 ± 3) K/GPa in Mn3Ge and (14.3 ± 2.0) K/GPa in Mn3Sn. Our measurements also helped identify the antiferomagnetic phase in these compounds as a piezomagnetic phase, rare behavior in which the total magnetization depends linearly on applied strain.From our pulse-echo ultrasound measurements in UTe2, we conclude that its superconducting order parameter has only one component which is the same between samples showing one and two superconducting transitions. Our data further suggests that the order parameter transforms as the B2u irreducible representation of the D2h point group. Comparing RUS and pulse-echo ultrasound data, as well as considering high-energy X-ray diffraction microscopy data, we speculate that the origin of the two transitions seen in some samples of UTe2 is due to structural inhomogeneity in these samples.
■590 ▼aSchool code: 0058.
■650 4▼aCondensed matter physics
■650 4▼aLow temperature physics
■650 4▼aThermodynamics
■653 ▼aMagnetism
■653 ▼aPhase transitions
■653 ▼aSuperconductivity
■653 ▼aUltrasound data
■690 ▼a0611
■690 ▼a0598
■690 ▼a0348
■71020▼aCornell University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162151▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
