BEGIN:VCALENDAR VERSION:2.0 PRODID:www.dresden-science-calendar.de METHOD:PUBLISH CALSCALE:GREGORIAN X-MICROSOFT-CALSCALE:GREGORIAN X-WR-TIMEZONE:Europe/Berlin BEGIN:VTIMEZONE TZID:Europe/Berlin X-LIC-LOCATION:Europe/Berlin BEGIN:DAYLIGHT TZNAME:CEST TZOFFSETFROM:+0100 TZOFFSETTO:+0200 DTSTART:19810329T030000 RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=3;BYDAY=-1SU END:DAYLIGHT BEGIN:STANDARD TZNAME:CET TZOFFSETFROM:+0200 TZOFFSETTO:+0100 DTSTART:19961027T030000 RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:DSC-9707 DTSTART;TZID=Europe/Berlin:20150716T100000 SEQUENCE:1437033640 TRANSP:OPAQUE DTEND;TZID=Europe/Berlin:20150716T110000 URL:https://www.dresden-science-calendar.de/calendar/en/detail/9707 LOCATION:IFW\, Helmholtzstraße 2001069 Dresden SUMMARY:Thota: Magneto-structural Quantum Phases and Reentrant Magnetic Beh avior of Few Complex Spinels CLASS:PUBLIC DESCRIPTION:Speaker: Dr. Subhash Thota\nInstitute of Speaker: Indian Insti tute of Technology Guwahati (IIT Guwahati)\, Indien\nTopics:\nMaterialien\ , Physik\n Location:\n Name: IFW (D 2E.27\, IFW Dresden\, Helmholtzstraß e 20)\n Street: Helmholtzstraße 20\n City: 01069 Dresden\n Phone: \n Fax: \nDescription: Magnetic spinels\, generally isostructural with the mi neral spinel MgAl2O4\, are considered as important class of materials beca use of their potential applications such as in microwave-wave devices\, tr ansformer cores\, actuators\, thermistors and magnetic recording. Such app lications of magnetic spinels (AB2O4) combined with the interesting physic s resulting from a variety of distributions of magnetic ions between the t etrahedral ‘A’-sites and octahedral ‘B’-sites has kept the field o f spinels a very active area of research for many decades. Therefore\, the current talk is focused on two types of spinels namely (i) Hausmannite (M n3O4) and (ii) Cobalt Ortho-Stannate &\; Titanates (Co2TiO4 &\; Co2S nO4\,) which belong to tetragonally distorted spinels and inverse-spinel f amily\, respectively.1-4 Special emphasis will be given to Hausmannite whi ch exhibits giant-atomic-displacement associated with enormous magnetocrys talline anisotropy\, strong magneto-dielectric coupling\, and giant magnet ic-entropy change at the onset of the ferrimagnetic Néel temperature. Dur ing the first-half of the talk\, the low-temperature magnetostructural qua ntum phases of Mn3O4 system will be discussed in the light of our recent e xperimental findings.1\,3 The second part of the talk will be focused on t he reentrant magnetic behavior of two inverse spinels Co2SnO4 and Co2TiO4. Both of these systems exhibit co-existence of longitudinal ferrimagnetic order below the Néel temperature TN = 41K (for Co2SnO4) and transverse sp in-glass (SG) state below TSG&\;#8201\; =&\;#8201\;39.1&\;#8201\; K (Co2SnO4) resulting from the presence of non-magnetic Sn4+ ions (or Ti4+ ) on the B sites.2\,4 The origin of ferrimagnetic ordering in both the sys tems is suggested to result from different magnetic moments of Co2+ on the A sites (3.87&\;#8201\;&\;#956\; B) and B sites (4.16&\;#8201\;& amp\;#956\; B).4 The temperature variation of ac-magnetic susceptibilities (&\;#967\;&\;#8242\;(T) and &\;#967\;&\;#8243\;(T))\, and ant iferromagnetic molecular field constants together with the exchange-consta nts of both the inverse spinels will be discussed. The effect of various d oping elements on the global magnetic structure of Co2TiO4 \, Co2SnO4 and Mn3O4 will be investigated at IFW-Dresden. References: [1] M. Kim et. al\, Phys. Rev. Lett. 104\, 136402 (2010). [2] S. Thota et. al. J. Phys.: Condens. Matter\, 27\, 166001 (2015) [3] F. Guillou\, et. al. Phys. Rev. B \, 83\, 094423\, (2011) [4] S. Thota et al. J. Appl. Phys. 113\, 203905 (2 013) DTSTAMP:20260427T162726Z CREATED:20150715T075258Z LAST-MODIFIED:20150716T080040Z END:VEVENT END:VCALENDAR