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UID:DSC-21213
DTSTART;TZID=Europe/Berlin:20240819T140000
SEQUENCE:1724046000
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20240819T153000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/21213
LOCATION:TUD\,    
SUMMARY:Reehuis: Coexisting magnetic phases on the frustrated pyrochlore su
 blattice of the mixed Jahn-Teller system Ni1-xCuxCr2O4
CLASS:PUBLIC
DESCRIPTION:Speaker: Manfred Reehuis\nInstitute of Speaker: HZB Berlin\nTop
 ics:\nPhysik\n Location:\n  Name: TUD (REC/C213)\n  Street:   \n  City:  \
 n  Phone: \n  Fax: \nDescription: <p><strong>Abstract</strong></p> <p>The 
 magnetic order and phase transitions in the normal spinel system Ni1-xCuxC
 r2O4 are studied by powder neutron and x-ray diffraction\, as well as by m
 agnetization measurements to get a complete magnetic phase diagram. For ch
 romites with x(Cu) &gt\; 0.5 a canted antiferromagnetic phase of Cr appear
 s first\, followed by the onset of ferromagnetism in the Cu sublattice at 
 lower temperature forming a ferrimagnetic lattice. Conversely\, with x(Cu)
  &lt\; 0.5 the ferrimagnetic order between the Cr and Cu spins occurs at t
 he higher ordering temperature followed by the onset of antiferromagnetic 
 order in the Cr sublattice. Apart from the crossing of the two boundary li
 nes of the transition temperatures at x(Cu) = 0.50 a compensation point of
  the ferrimagnetic moments is determined at x(Cu) = 0.60\, where the spont
 aneous magnetization almost completely vanishes. Most remarkable is the an
 tiferromagnetic Cr ordering on the orthorhombically distorted pyrochlore l
 attice for samples in the x(Cu) range from 0 to 0.12 due to the large vari
 ety of coexisting commensurate and incommensurate magnetic phases. The dif
 ferent magnetic phases are discussed qualitatively based on the lattice di
 mensions depending on the concentration ratio of two Jahn-Teller ions at t
 he tetrahedral A site\, where Ni2+ causes elongated and Cu2+ compressed te
 tragonal lattice distortions.</p> <p><strong>BigBlueButton:</strong> https
 ://bbb.tu-dresden.de/b/dar-mbs-me8-gsc (https://bbb.tu-dresden.de/b/dar-mb
 s-me8-gsc)</p>
DTSTAMP:20260610T133641Z
CREATED:20240801T053938Z
LAST-MODIFIED:20240819T054000Z
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