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2017年6月20日

AHMF & Cadet Program Joint Seminarのご案内

下記の通り先端強磁場科学研究センターとの共催セミナーを開催いたします。

AHMF & Cadet Program Joint Seminar
先端強磁場科学研究センター&カデットプログラム共催セミナー

講師 (Speaker): Dr. Karlo Penc
(Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary)

日時 (Date & Time): 16:30-18:00, June 20, 2017

場所 (Venue): H601 Meeting room (H棟601,セミナー室B)

タイトル(Title) : Spin nematic phases : theory and materials

要旨 (Abstract): I will explore the possibility for spin systems to develop a type of order that breaks the O(3) spin symmetry but does not have a magnetic moment. Such ordering is usually referred to as multipolar or nematic, with quadrupolar being the simplest example. These phases have been found in S=1 Heisenberg models extended with biquadratic exchange, in certain S=1/2 Heisenberg models with both ferromagnetic and antiferromagnetic exchange couplings, and in models with cyclic ring-exchange terms. I will present methods which can be used to understand and characterize quadrupolar and nematic phases. While quadrupolar/nematic ordering is well documented in model systems, it has not yet been identified unambiguously in real materials, although there exist some promising candidates. I will also touch on the magneto-electric coupling, which may allow to observe spin-nematic waves by electromagnetic radiation.

問い合わせ先:先端強磁場科学研究センター 萩原政幸
Masayuki Hagiwara (Center for Advanced High Magnetic Field Science)