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<P style="TEXT-ALIGN: center; MARGIN: 0px" align=center><B><SPAN lang=EN-GB style="FONT-FAMILY: 'Century Gothic',sans-serif; COLOR: #5f5f5f">Institut za fiziku, Bijenička cesta 46,</SPAN></B></P>
<P style="TEXT-ALIGN: center; MARGIN: 0px" align=center><B><SPAN lang=EN-GB style="FONT-FAMILY: 'Century Gothic',sans-serif; COLOR: #5f5f5f">predavaonica u zgradi Mladen Paić</SPAN></B></P><STRONG><B><SPAN lang=EN-GB style="FONT-SIZE: 14pt; FONT-FAMILY: 'Century Gothic',sans-serif; COLOR: #993300">ponedjeljak, 15. lipnja 2015., u 15:00 sati</SPAN></B><BR></STRONG></DIV>
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<DIV style="TEXT-ALIGN: center"><SPAN lang=EN-GB style="FONT-SIZE: 16pt; FONT-FAMILY: 'Times New Roman',serif; COLOR: #55913c"><SPAN lang=EN-GB style="FONT-SIZE: 16pt; FONT-FAMILY: 'Times New Roman',serif; COLOR: #55913c"><STRONG>High-pressure cupric oxide: a room-temperature multiferroic</STRONG></SPAN></SPAN><SPAN lang=EN-GB style="FONT-SIZE: 16pt; FONT-FAMILY: 'Times New Roman',serif; COLOR: #55913c"><STRONG> </STRONG></SPAN></DIV>
<DIV style="TEXT-ALIGN: center"><B><SPAN lang=EN-GB style="FONT-SIZE: 14pt; FONT-FAMILY: 'Century Gothic',sans-serif">Dr. Xavier Rocquefelte</SPAN></B></DIV>
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<DIV style="TEXT-ALIGN: center"><B><B><B><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif">Institut des Sciences Chimiques de Rennes, Rennes, France</SPAN></B></B></B><B><B><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif"> </SPAN></B></B></DIV>
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<P style="TEXT-ALIGN: left; MARGIN: 0px; LINE-HEIGHT: 115%"><SPAN style="FONT-FAMILY: arial,helvetica,sans-serif">Multiferroic materials [1], in which ferroelectric and magnetic ordering coexist, are of fundamental interest for the development of multi-state memory devices that allow for electrical writing and non-destructive magnetic readout operation. The great challenge is to create multiferroic materials that operate at room temperature and have a large ferroelectric polarization P. Cupric oxide, CuO, is promising because it exhibits a significant polarization,that is, P~0.1 μC/cm², for a spin-spiral multiferroic [2]. Unfortunately, CuO is only ferroelectric in a temperature range of 20 K, from 210 to 230 K. Here we propose an original theoretical investigation of the magnetic and ferroelectric properties of CuO under high pressure based on first-principles and Monte-Carlo calculations. We have established that pressure-driven phase competition renders CuO multiferroic at room-temperature [3-7], while preserving its large polarization and strong magneto-electric coupling. Moreover, under pressure values of 20-40 GPa the multiferroic phase becomes stable in a very broad temperature domain extending above 300 K (from 0 to T > 300 K).</SPAN></P>
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<P style="TEXT-ALIGN: left; MARGIN: 0px; LINE-HEIGHT: 115%"><SPAN style="FONT-FAMILY: arial,helvetica,sans-serif"></SPAN> <IMG src="cid:ad6da5f761b237e6d10982f557f523de4ea28286@zimbra" width=510 height=480> <IMG src="cid:6110b93bf757490b92e78110d31e41d29babf281@zimbra" width=494 height=479></P>
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<P style="TEXT-ALIGN: left; MARGIN: 0px; LINE-HEIGHT: 115%"><SPAN style="FONT-FAMILY: arial,helvetica,sans-serif">[1] Cheong, S. W. & Mostovoy, M. Multiferroics: a magnetic twist for ferroelectricity, <EM>Nature Mater.</EM> <STRONG>6</STRONG>, 13-20 (2007).<BR>[2] Kimura, T., Sekio, Y., Nakamura, H., Siegrist, T., Ramirez, A. P. Cupric oxide as an induced-multiferroic with high-T<SPAN style="FONT-SIZE: x-small">C</SPAN>, <EM>Nature Mater.</EM> <STRONG>7</STRONG>, 291-294 (2008).<BR>[3] Giovannetti, G. <EM>et al.</EM> High-T<SPAN style="FONT-SIZE: x-small">C</SPAN> Ferroelectricity Emerging from Magnetic Degeneracy in Cupric Oxide, <EM>Phys. Rev. Lett.</EM> <STRONG>106</STRONG>, 026401 (2011).<BR>[4] Rocquefelte, X., Schwarz, K. & Blaha, P. Comment on “High-T<SPAN style="FONT-SIZE: x-small">C</SPAN> Ferroelectricity Emerging from Magnetic Degeneracy in Cupric Oxide”, <EM>Phys. Rev. Lett.</EM> <STRONG>107</STRONG>, 239701 (2011).<BR>[5] Rocquefelte, X. et al. Short-range magnetic order and temperature-dependent properties of cupric oxide, <EM>J. Phys. Condens. Matter</EM> <STRONG>21</STRONG>, 045502 (2010).<BR>[6] Rocquefelte, X., Schwarz, K. & Blaha, P. Theoretical Investigation of the Magnetic Exchange Interactions in Copper(II) Oxides under Chemical and Physical Pressures, <EM>Scientific Reports</EM> <STRONG>2</STRONG>, 759 (2012).<BR>[7] Rocquefelte, X. <EM>et al.</EM> Room-temperature spin-spiral multiferroicity in high-pressure cupric oxide, <EM>Nature Communications</EM> <STRONG>4</STRONG>, 2511 (2013).</SPAN></P>
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<DIV style="TEXT-ALIGN: left"><B><SPAN lang=EN-GB style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century Gothic',sans-serif"><B><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif"> </SPAN></B></SPAN></B></DIV>
<DIV style="TEXT-ALIGN: left"><B><SPAN lang=EN-GB style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century Gothic',sans-serif"><B><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif"> </SPAN></B></SPAN></B></DIV>
<DIV style="TEXT-ALIGN: right"><B><SPAN lang=EN-GB style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century Gothic',sans-serif"><B><SPAN lang=EN-GB style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif">Voditelji seminara IF-a: <A href="mailto:natasav@ifs.hr" target=_blank>Nataša Vujičić</A> i <A href="mailto:damirs@ifs.hr" target=_blank>Damir Starešinić</A></SPAN></B></SPAN></B></DIV></DIV></DIV></DIV></DIV>
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