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Multipolar Dynamics and Effect of Disorder in the Rare-Earth Vanadates
Multipolar Dynamics and Effect of Disorder in the Rare-Earth Vanadates
Multipolar Dynamics and Effect of Disorder in the Rare-Earth Vanadates

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202103135
ISBN  
9798311951838
DDC  
540
저자명  
Li, Yuntian.
서명/저자  
Multipolar Dynamics and Effect of Disorder in the Rare-Earth Vanadates
발행사항  
[Sl] : Stanford University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
132 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Fisher, Ian.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2025.
초록/해제  
요약The ferroquadrupole order of local 4f atomic orbitals in the magnetic insulator TmVO4 provides a local-moment realization of the nematic order for which the underlying Hamiltonian is well-established. This model material system enables us to explore several important open questions about the equilibrium properties and dynamics of nematic materials which have important implications beyond just this specific case. This thesis document presents a quantitative experimental study of TmVO4and the closely related magnetic analog YbVO4, including exploring slow dynamics at low temperatures and the effects of disorder induced by chemical substitutions. The following chapters record measurement principles and new experimental methods that focus on probing magnetization and temperature response to AC fields as a means to investigate complex magnetization dynamics, as well as higher-order multipole dynamics.From an experimental technique perspective, Chapters 2 and 3 introduce a new device setup of the AC magnetocaloric effect, which is complementary to AC susceptibility measurements. The combination of the two chapters describes a framework to understand the magneto-thermal response within these materials for both types of measurement. First, a new set of instrument development is established based on the measurement of GdVO4, for which crystal field effects are nominally absent, providing a more straightforward case for which a thermal transport process explains the observation of magneto-thermal relaxation. A detailed experimental tutorial included in the two chapters gives researchers an opportunity to efficiently understand and establish similar measurements in standard material research facilities, which have access to analog electronics, magnetic fields, and low-temperature equipment.The measurements and analysis in Chapter 5 reveal that the dissipation is characterized by a single intrinsic time constant for the magnetic case (YbVO4). In contrast, the quadrupolar material (TmVO4) in Chapter 6 exhibits a range of relaxation times, indicative of glassy behavior, that is tentatively ascribed to the quadrupolar degrees of freedom.
일반주제명  
Crystal structure
일반주제명  
Study abroad
일반주제명  
Spheres
일반주제명  
Racial profiling
일반주제명  
Magnetic fields
일반주제명  
Normal distribution
일반주제명  
Symmetry
일반주제명  
Phase transitions
일반주제명  
Heat conductivity
일반주제명  
Materials science
일반주제명  
Atomic physics
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798311951838
■035    ▼a(MiAaPQ)AAI31974601
■035    ▼a(MiAaPQ)Stanfordfd189vg5633
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a540
■1001  ▼aLi,  Yuntian.
■24510▼aMultipolar  Dynamics  and  Effect  of  Disorder  in  the  Rare-Earth  Vanadates
■260    ▼a[Sl]▼bStanford  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a132  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Fisher,  Ian.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2025.
■520    ▼aThe  ferroquadrupole  order  of  local  4f  atomic  orbitals  in  the  magnetic  insulator  TmVO4  provides  a  local-moment  realization  of  the  nematic  order  for  which  the  underlying  Hamiltonian  is  well-established.  This  model  material  system  enables  us  to  explore  several  important  open  questions  about  the  equilibrium  properties  and  dynamics  of  nematic  materials  which  have  important  implications  beyond  just  this  specific  case.  This  thesis  document  presents  a  quantitative  experimental  study  of  TmVO4and  the  closely  related  magnetic  analog  YbVO4,  including  exploring  slow  dynamics  at  low  temperatures  and  the  effects  of  disorder  induced  by  chemical  substitutions.  The  following  chapters  record  measurement  principles  and  new  experimental  methods  that  focus  on  probing  magnetization  and  temperature  response  to  AC  fields  as  a  means  to  investigate  complex  magnetization  dynamics,  as  well  as  higher-order  multipole  dynamics.From  an  experimental  technique  perspective,  Chapters  2  and  3  introduce  a  new  device  setup  of  the  AC  magnetocaloric  effect,  which  is  complementary  to  AC  susceptibility  measurements.  The  combination  of  the  two  chapters  describes  a  framework  to  understand  the  magneto-thermal  response  within  these  materials  for  both  types  of  measurement.  First,  a  new  set  of  instrument  development  is  established  based  on  the  measurement  of  GdVO4,  for  which  crystal  field  effects  are  nominally  absent,  providing  a  more  straightforward  case  for  which  a  thermal  transport  process  explains  the  observation  of  magneto-thermal  relaxation.  A  detailed  experimental  tutorial  included  in  the  two  chapters  gives  researchers  an  opportunity  to  efficiently  understand  and  establish  similar  measurements  in  standard  material  research  facilities,  which  have  access  to  analog  electronics,  magnetic  fields,  and  low-temperature  equipment.The  measurements  and  analysis  in  Chapter  5  reveal  that  the  dissipation  is  characterized  by  a  single  intrinsic  time  constant  for  the  magnetic  case  (YbVO4).  In  contrast,  the  quadrupolar  material  (TmVO4)  in  Chapter  6  exhibits  a  range  of  relaxation  times,  indicative  of  glassy  behavior,  that  is  tentatively  ascribed  to  the  quadrupolar  degrees  of  freedom.
■590    ▼aSchool  code:  0212.
■650  4▼aCrystal  structure
■650  4▼aStudy  abroad
■650  4▼aSpheres
■650  4▼aRacial  profiling
■650  4▼aMagnetic  fields
■650  4▼aNormal  distribution
■650  4▼aSymmetry
■650  4▼aPhase  transitions
■650  4▼aHeat  conductivity
■650  4▼aMaterials  science
■650  4▼aAtomic  physics
■690    ▼a0794
■690    ▼a0748
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357126▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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