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UID:DSC-20436
DTSTART;TZID=Europe/Berlin:20240126T100000
SEQUENCE:1706250907
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20240126T110000
URL:https://dresden-science-calendar.org/calendar/de/detail/20436
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Dragomir: Synthesis\, crystal growth\, and characterisation of sele
 cted frustrated magnets 
CLASS:PUBLIC
DESCRIPTION:Speaker: Mirela Dragomir\nInstitute of Speaker: Jozef Stefan In
 stitute\, Ljubljana\, Slovenia\nTopics:\n\n Location:\n  Name: IFW (B3E.26
 \, IFW Dresden)\n  Street: Helmholtzstraße 20\n  City: 01069 Dresden\n  P
 hone: \n  Fax: \nDescription: Most magnetic materials exhibit long-range m
 agnetic order at low temperatures. In geometrically frustrated magnets\, h
 owever\, the topology of the lattice prevents long-range magnetic order do
 wn to temperatures close to absolute zero\, often leading to exotic ground
  states. In my presentation\, I will explore several compelling examples o
 f such compounds. Materials with a K2NiF4-type structure have been the arc
 hetype of low-dimensional magnetism since the 1970s. With the discovery of
  high-temperature superconductivity in hole-doped La2CuO4 in 1986\, the K2
 NiF4-type structure has attracted even more attention. In the first part o
 f my talk\, I will focus on the synthesis\, crystal growth and magnetic pr
 operties of two groups of materials with the K2NiF4 type structure and the
  I4/mmm space group\, namely the magnetically frustrated Ba1&amp\;amp\;#87
 22\;xLa1+xMnO4+&amp\;amp\;#948\; [1] and La1.6&amp\;amp\;#8722\;xNd0.4SrxC
 uO4 superconductors [2].  The geometrically frustrated SrCu2(BO3)2 is the 
 experimental realisation of the Shastry-Sutherland model for orthogonally 
 interacting S = 1/2 dimers. This phase exhibits interesting magnetic plate
 aux and dynamic properties [3] and serves as an important test case for th
 e understanding of quantum magnetism. A strong interplay between the cryst
 al structure and the magnetic properties is also expected\, as unique grou
 nd states such as quantum spin liquid states or superconductivity are pred
 icted when the system is doped. However\, experiments lag behind theory as
  the chemical doping of SrCu2(BO3)2 has not yet been sufficiently explored
 . The second part of my talk will focus on the synthesis and crystal growt
 h of doped SrCu2(BO3)2 and describe the effects of different dopants on th
 e magnetic properties. The last part of my talk will focus on NdTa7O19 whi
 ch represents the first realisation of a quantum spin liquid on a triangul
 ar spin lattice with dominant Ising exchange interaction [4]. With current
  studies performed solely on powders\, single crystals are essential for a
  more complete understanding of the magnetic interactions. In this talk\, 
 I will present a flux method that we developed for the growth of NdTa7O19 
 and related rare earth heptatantalates.
DTSTAMP:20260406T153526Z
CREATED:20240113T063927Z
LAST-MODIFIED:20240126T063507Z
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