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Dive into the research topics where K. Suekuni is active.

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Featured researches published by K. Suekuni.


Applied Physics Letters | 2008

Ba8Ga16Sn30 with type-I clathrate structure: Drastic suppression of heat conduction

Marcos A. Avila; K. Suekuni; Kazunori Umeo; Hiroshi Fukuoka; Shoji Yamanaka; Toshiro Takabatake

For the past decade, intermetallic clathrates have been rattling their way into mainstream research in thermoelectrics. The unusual vibrations of their guest ions inside oversized cages interfere with the cage phonons while leaving the electronic flow intact, providing an exotic way to achieve a best-of-both-worlds scenario in terms of electrical and thermal transport in the same material. Here, we present the structural and thermoelectric properties of Ba8Ga16Sn30 single crystals grown in the type-I clathrate structure (β-BGS), showing one of the lowest recorded thermal conductivities κ(T) for any bulk compound, while still behaving electronically as a heavily doped n-type semiconducting crystal.


Physical Review B | 2007

Cage-size control of guest vibration and thermal conductivity in Sr 8 Ga 16 Si 30 − x Ge x

K. Suekuni; Marcos A. Avila; Kazunori Umeo; T. Takabatake

We present a systematic study of thermal conductivity, specific heat, electrical resistivity, thermopower, and x-ray diffraction measurements performed on single-crystalline samples of the pseudoquaternary type-I clathrate system


Journal of the Physical Society of Japan | 2005

Probing Glasslike Excitations in Single-Crystalline Sr8Ga16Ge30 by Specific Heat and Thermal Conductivity

Kazunori Umeo; Marcos A. Avila; Takeaki Sakata; K. Suekuni; Toshiro Takabatake

{\mathrm{Sr}}_{8}{\mathrm{Ga}}_{16}{\mathrm{Si}}_{30\ensuremath{-}x}{\mathrm{Ge}}_{x}


Physical Review B | 2009

Optical conductivity of rattling phonons in type-I clathrate Ba 8 Ga 16 Ge 30

Tatsuya Mori; S. Goshima; Kei Iwamoto; S. Kushibiki; Hiroaki Matsumoto; N. Toyota; K. Suekuni; Marcos A. Avila; T. Takabatake; Takumi Hasegawa; N. Ogita; M. Udagawa

, in the full range of


Science and Technology of Advanced Materials | 2008

Soft x-ray photoelectron spectroscopy study of type-I clathrates

Jun Tang; Zhaofei Li; Jing Ju; Ryotaro Kumashiro; Marcos A. Avila; K. Suekuni; Toshiro Takabatake; Fangzhun Guo; Keisuke Kobayashi; K. Akai; Katsumi Tanigaki

0\ensuremath{\leqslant}x\ensuremath{\leqslant}30


Journal of Physics: Conference Series | 2007

Raman scattering of type-I clathrate compounds: A8Ga16Ge30(A = Eu, Sr, Ba) and Sr8Ga16Si30-xGex

Yuichi Takasu; Takumi Hasegawa; N. Ogita; M. Udagawa; K. Suekuni; Marcos A. Avila; T. Takabatake

. All the samples show metallic behavior with


international conference on thermoelectrics | 2007

Thermal conductivity and guest vibration in cage-size controlled Ba 8 In 16 Ge 30−x M x (M=Si, Sn)

K. Suekuni; Shuhei Yamamoto; Marcos A. Avila; T. Takabatake

n


international conference on thermoelectrics | 2007

Thermoelectric properties of double-filled skutterudites Ca 1-x La x Fe 4-y Co y Sb 12

Shota Narazu; Yuta Hadano; K. Suekuni; T. Takabatake; K. Suzuki; Hiroaki Anno

-type majority carriers. However, the thermal conductivity and specific heat strongly depend on


Physical Review B | 2008

Simultaneous structure and carrier tuning of dimorphic clathrate Ba 8 Ga 16 Sn 30

K. Suekuni; Marcos A. Avila; Kazunori Umeo; Hiroshi Fukuoka; Syoji Yamanaka; T. Nakagawa; T. Takabatake

x


Physical Review B | 2010

Off-center rattling modes and glasslike thermal conductivity in the type-I clathrate Ba 8 Ga 16 Sn 30

K. Suekuni; Yuichi Takasu; Takumi Hasegawa; N. Ogita; M. Udagawa; Marcos A. Avila; T. Takabatake

. Upon increasing

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Marcos A. Avila

Universidade Federal do ABC

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Keisuke Kobayashi

Japan Atomic Energy Agency

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