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<p style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 14pt;
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align="center"><font face="Arial Unicode MS"><b><span
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mso-bidi-font-size: 14.0pt">Javno predavanje o
rezultatima <i>Postdoc</i> projekta Hrvatske
zaklade za znanost: ’Proučavanje magnetskog
uređenja u sustavu sa spinskim lancima CuSe2O5
tehnikama magnetske rezonancije’</span></b><b><span
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align="center"><font face="Arial Unicode MS"><span
class="object"><b><span style="FONT-SIZE: 14pt;
COLOR: black; mso-bidi-font-size: 12.0pt">dr.
sc. Mirta Herak</span></b></span><b><span
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12.0pt"><o:p></o:p></span></b></font></p>
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mso-line-height-rule: exactly" align="center"><font
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fiziku, Zagreb</span></b><b
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align="center"><b><i><span style="FONT-SIZE: 11pt;
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mso-bidi-font-size: 12.0pt">E-mail:</span></i></b><span
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</font></span><b><i><span style="FONT-SIZE: 11pt;
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mso-bidi-font-size: 9.0pt; mso-ansi-language:
EN" lang="EN"><a href="mailto:petek@pitt.edu">mirta@ifs.hr</a></span></i></b><b><i><span
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<p style="margin-bottom: 0cm; line-height: 150%;"><b><span
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century
Gothic'"> </span></b><font color="#000000"><font
face="Arial, sans-serif"><font size="2"><span
lang="en-US"><b>U
predavanju će biti predstavljeni rezultati
jednogodišnjeg projekta
</b></span></font></font></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><i><b>Proučavanje
magnetskog uređenja u sustavu sa spinskim
lancima CuSe</b></i></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><i><b>2</b></i></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><i><b>O</b></i></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><i><b>5</b></i></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><i><b>
tehnikama magnetske rezonancije</b></i></span></font></font></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>
koji je financiran u okviru </b></span></font></font></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><i><b>Postdoc</b></i></span></font></font></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>
programa Hrvatske zaklade za znanost.
Projekt je najvećim dijelom
proveden na Institutu Jožef Stefan u
Ljubljani. U okviru projekta
proučavan je novi jednodimenzionalni
magnetski sustav CuSe</b></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>2</b></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>O</b></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>5</b></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>
eksperimentalnim tehnikama elektronske
spinske rezonancije (ESR),
mionske spinske relaksacije (muSR),
nuklearne magnetske rezonancije
(NMR), a načinjena su i mjerenja neutronskog
raspršenja i magnetske
susceptibilnosti. Magnetizam u CuSe</b></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>2</b></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>O</b></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>5</b></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>
dolazi od spinova S = ½ iona bakra Cu</b></span></font></font></font><font
color="#000000"><sup><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>2+</b></span></font></font></sup></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>.
Izotropna energija interakcije između
spinova na lancu u ovom
sustavu iznosi J = 160 K, a prisustvo
relativno slabe međulančane
interakcije J'= 0.1 J rezultira dugodosežnim
antiferomagnetskim
uređenjem ispod T</b></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>N</b></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>
= 17 K. Utjecaj slabe anizotropije energije
izmjene presudan je za
odabir osnovnog stanja u ovom sustavu. Iz
rezultata ESR mjerenja u
paramagnetskom stanju u širokom frekventnom
području određen je
anizotropni spinski hamiltonijan CuSe</b></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>2</b></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>O</b></span></font></font></font><font
color="#000000"><sub><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>5</b></span></font></font></sub></font><font
color="#000000"><font face="Arial, sans-serif"><font
size="2"><span lang="en-US"><b>
[1]. Uređeno stanje ispitivano je bez
primjene magnetskog polja
mjerenjima muSR-a i elastičnog neutronskog
raspršenja, te
mjerenjima antiferomagnetske rezonancije
(AFMR), NMR-a i
susceptibilnosti koja se vrše u konačnom
magnetskom polju.
Rezultati pokazuju da je uređenje relativno
jednostavno sumjerljivo
antiferomagnetsko, a spinska reorijentacija
događa se u niskim
magnetskim poljima, H = 1.3 T [2]. U
predavanju će biti uspoređeni
rezultati različitih tehnika uz osvrt na
njihove prednosti i
nedostatke.<br>
</b></span></font></font></font></p>
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<p style="margin-bottom: 0cm; line-height: 0.35cm;"><span
lang="en-US">[1]
M. Herak, A. Zorko, D. Arčon, A. Potočnik, M.
Klanjšek, J. van
Tol, A. Ozarowski, and <br>
</span></p>
<p style="margin-bottom: 0cm; line-height: 0.35cm"><span
lang="en-US">H. Berger, Phys. Rev. B </span><span
lang="en-US"><b>84</b></span><span lang="en-US">,
184436 (2011).</span></p>
<p style="margin-bottom: 0cm; line-height: 0.35cm"
lang="en-US">[2]
M. Herak et al., u pripremi.</p>
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