Ultrasonic Team (T. Yanagisawa, Hokkaido Univ,)    


Mar 28, 2008
Ultrasonic investigation of field-dependent ordered phases in the filled skutterudite compound PrOs4As12
T. Yanagisawa, W. M. Yuhasz, T. A. Sayles, P. -C. Ho, M. B. Maple, H. Watanabe, Y. Yasumoto, Y. Nemoto, T. Goto, Z. Henkie and A. Pietraszko

Elastic constant measurements down to 0.48 K and in magnetic fields up to 11 T were performed on a single crystal of the filled skutterudite compound PrOs4As12. The longitudinal CL111=CB+4C44/3 mode shows Curie-type softening below ~25 K, which is explained in terms of the quadrupole susceptibility modified by a crystalline electric field with a Γ4(2) ground state. A detailed H-T phase diagram for H || [111] is compiled with the elastic anomalies, which appear on the boundaries of two ordered phases at temperatures below 2.3 K and in fields below 3 T. The intermediate phase between 2 and 2.5 T assumes the aspect of antiferroquadrupolar ordering.

Phys. Rev. B 77 (2008) 094435,

also on J. Phys. Soc. Jpn. 77 (2008) Suppl. A, pp. 225-228.


Figure : Magnetic field vs. Temperature (H-T) phase diagram of PrOs4As12 with fields (a) H || [111] and (b) H || [1-10]. Data points are determined by a feature of elastic anomalies; upward or downward in CL111 vs. H (solid circles and squares), CL111 vs. T (open circles and squares); minimum in CL111 vs. H (times), CL111 vs. T (plus). Error bars on the markers indicate roughly estimated transition width. Solid lines are guides to the eyes, separating the PM region (phase I), AFM region (phase III) and unknown ordered phase II and II'.

(*This research was performed at Niigata University in 2007-2008.)

The focus of our research (Nihongo)

Mar 08, 2008


 私の専門は物性物理学といわれる分野です。物性とはまさにモノの性質。地球上の全てのモノは元素によって成り立っていますが、さまざまなモノの性質はその元素が持つ電子の状態によって決まっているといっても過言ではありません。この電子は「 スピン 」という磁気に関係する自由度と、「 軌道 」とよばれる電気的な自由度を持っています。このうちスピンの自由度は磁気測定などで検出することができますが、軌道の自由度は「超音波」で検出することができます。
 私は異分野との交流・共同研究を望んでいます。興味の有る方は是非 研究室にいらっしゃってください。

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