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UID:DSC-18262
DTSTART;TZID=Europe/Berlin:20211207T145000
SEQUENCE:1638831990
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20211207T162000
URL:https://dresden-science-calendar.org/calendar/de/detail/18262
LOCATION:TUD\,    
SUMMARY:Heinze: The Natural Mineral Atacamite\, Cu2Cl(OH)3\, as Model Compo
 und of the Frustrated S = 1/2 Sawtooth Chain
CLASS:PUBLIC
DESCRIPTION:Speaker: Leonie Heinze\nInstitute of Speaker: TU Braunschweig\n
 Topics:\nPhysik\n Location:\n  Name: TUD ()\n  Street:   \n  City:  \n  Ph
 one: \n  Fax: \nDescription: <![CDATA[<p><strong>Abstract:</strong></p>  <
 p>In frustrated magnetic systems the local geometries and the magnetic int
 eractions are incompatible\, which can lead to the suppression of magnetic
  order. As a consequence\, a multitude of complex and novel magnetic state
 s can arise\, such as quantum spin liquids and magnetization plateaus. In 
 order to test these theoretical concepts\, suitable model systems are iden
 tified and studied experimentally and it has been shown in the past that s
 ome can be found among natural minerals (see for instance Refs. [1\,2]). R
 ecently\, the mineral atacamite\, Cu2Cl(OH)3\, has been established as a u
 nique model compound of the S = ½ sawtooth chain [3\,4]\, which is a se
 minal model of frustrated quantum magnetism. Theoretically\, this model of
  corner-sharing triangles arranged in a chain has been studied for decades
  (see for instance Ref. [5]) and\, e.g.\, ½-magnetization plateaus were p
 redicted.</p>  <p>In the case of atacamite\, the dominant magnetic couplin
 g J4 ~ 360 K runs linearly along the chain spine\, the secondary mag
 netic coupling J3 ~ 102 K within the sawtooth triangles. Together wi
 th residual interchain couplings of a few Kelvin\, atacamite is driven int
 o a long-range ordered antiferromagnetic (AFM) ground state below TN =
  8.4 K. Here\, the spin systems of the two inequivalent Cu sites are a
 ligned almost perpendicular to each other [3]. This AFM phase is suppres
 sed in magnetic fields of ~ 30 T for <strong>H </strong>|| b\, whe
 re an unusual and wide plateau-like magnetization at M ~ Msat/2 has be
 en found. This magnetization behavior\, however\, is not originating from 
 plateau physics of the quantum sawtooth chain and is likely to stem from t
 he weak 3D connectivity of the sawtooth chains [3].</p>  <p>In my presen
 tation\, I will introduce the magnetism of atacamite\, discuss its magneti
 c phase diagram and its unusual high-field behavior. Further\, I will pres
 ent the results of additional experiments studying the plateau-like state 
 by means of thermodynamic as well as microscopic measurement techniques 
 [6].</p>  <p>[1] H. Kikuchi et al.\, Phys. Rev. Lett. <strong>94</strong>\
 , 227201 (2005).</p>  <p>[2] A. U. B. Wolter et al.\, Phys. Rev. B <strong
 >85</strong>\, 014407 (2012).</p>  <p>[3] L. Heinze et al.\, Phys. Rev. Le
 tt. <strong>126</strong>\, 207201 (2021).</p>  <p>[4] L. Heinze et al.\, P
 hysica B <strong>536</strong>\, 377 (2018).</p>  <p>[5] J. Richter et al.\
 , J. Phys. Condens. Matter <strong>16</strong>\, S779 (2004).</p>  <p>[6] 
 T. Reimann et al.\, in preparation.</p>  <p><strong>BigBlueButton:</strong
 ></p>  <p>https://selfservice.zih.tu-dresden.de/l/link.php?m=151014&amp\;p
 =a4ea9b15 (https://selfservice.zih.tu-dresden.de/l/link.php?m=151014&amp\;
 p=a4ea9b15) (TUD)</p>  <p>https://selfservice.zih.tu-dresden.de/link.php?m
 =151014&amp\;p=5774529b (https://selfservice.zih.tu-dresden.de/link.php?m=
 151014&amp\;p=5774529b) (external)</p>
DTSTAMP:20260411T044519Z
CREATED:20211105T230549Z
LAST-MODIFIED:20211206T230630Z
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