= Masaki Oshikawa
{c}
{tag=Physicist}
{wiki}
<Masaki Oshikawa> coauthored a theory interpreting field-induced <Néel order> in thallium copper chloride as <Bose-Einstein condensation> of dilute <magnons>. An applied <magnetic field> changes the energy cost of these magnetic excitations, allowing their population to become large enough for collective ordering. The 2000 work compared a dilute-boson <mean-field theory> with the measured <temperature> dependence of <magnetization>. This provides a connection between an insulating magnet and the collective <quantum mechanics> of a gas of <bosons>, without requiring the magnetic material to become a fluid.<Bose-Einstein Condensation of Dilute Magnons in TlCuCl3 by Tetsuro Nikuni and others>[Physical Review Letters 84, 5868–5871, abstract and dilute-boson interpretation]{ref}
\Image[https://www.issp.u-tokyo.ac.jp/maincontents/organization/labs/images/oshikawa2023.jpg]
{title=Portrait of <Masaki Oshikawa>}
{description=External portrait hosted by Institute for Solid State Physics, University of Tokyo.}
{source=https://www.issp.u-tokyo.ac.jp/maincontents/organization/labs/oshikawa_group_en.html}
{width=260}
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