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SUMMARY:Searching for Quantum Spin Liquids in Cerium-based Pyrochlores - B
 enedikt Placke\, Max Planck Institute
DTSTART:20230907T130000Z
DTEND:20230907T140000Z
UID:TALK204658@talks.cam.ac.uk
CONTACT:Gaurav
DESCRIPTION:Spin liquids are magnetic states of matter with do not order e
 ven at the lowest temperatures\, but instead feature strong\, correlated f
 luctuations which are effectively described by an emergent gauge theory. M
 embers of the family of materials called rare-earth Pyrochlores (R$_2$M$_2
 $O$_7$) have been known to host a classical spin liquid phase for a long t
 ime. Most prominently\, the so-called “spin ice" compounds Dy$_2$Ti$_2$O
 $_7$ and Ho$_2$Ti$_2$O$_7$ realize an emergent Maxwell theory at low tempe
 ratures\, with excitations taking the form of magnetic monopoles. Recent e
 xperiments on the cerium-based Pyrochlores Ce$_2$Zr$_2$O$_7$ and Ce$_2$Sn$
 _2$O$_7$ suggest that these materials may realize a quantum version of the
  this phase called “quantum spin ice”.  In this talk\, I focus on the 
 theoretical description of cerium-based Pyrochlores. Their most general sy
 mmetry-allowed exchange Hamiltonian takes a remarkably simple form\, that 
 is a XYZ model on the Pyrochlore lattice. This allows us to make reliable 
 numerical predictions for all available experimental measurements in the f
 ull phase diagram of this model and\, in turn\, to obtain reliable estimat
 es for the Hamiltonian parameters for real materials. Along the way\, we a
 lso gain new insights into the ground state phase diagram of the theory mo
 del.\n
LOCATION:TCM Seminar Room
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