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田端 千紘*; 稲見 俊哉; 道村 真司*; 横山 淳*; 日高 宏之*; 柳澤 達也*; 網塚 浩*
Philosophical Magazine, 94(32-33), p.3691 - 3701, 2014/00
被引用回数:12 パーセンタイル:36.1(Materials Science, Multidisciplinary)We performed synchrotron X-ray diffraction measurements on a small single crystal of URuSi
. A backscattering diffraction setup (2
) in combination with a Si(6 6 0) monochromator ensures a high instrumental resolution of
, where
denotes a lattice-plane spacing and
is its spread expressed as the full width at half maximum (FWHM). We carefully measured the (5 5 0) Bragg peak in the temperature range between 5 and 25 K, and found it to show no signature of broadening and splitting when "Hidden Order (HO)" sets in below 17.5 K. Temperature variation of the peak position closely follows the behaviour of the known linear thermal expansion coefficient. Detailed analysis of the peak width reveals that the tetragonal fourfold rotational symmetry of URu
Si
is conserved in HO within the experimental accuracy of the orthorhombicity of
.
清水 悠晴*; 池田 陽一*; 若林 琢巳*; 芳賀 芳範; 天谷 健一*; 日高 宏之*; 柳澤 達也*; 網塚 浩*
Journal of the Physical Society of Japan, 80(9), p.093701_1 - 093701_4, 2011/09
被引用回数:7 パーセンタイル:48.39(Physics, Multidisciplinary)Low-temperature specific heat measurements under magnetic field were performed on a single crystal UBe. The specific heat shows a
behavior below
0.7
, where
is the superconducting transition temperature, suggesting the existence of point nodes in the superconducting gap. Together with the isotropic behavior of the upper critical magnetic field, the symmetry of the Cooper paring is discussed.
清水 悠晴*; 池田 陽一*; 若林 琢巳*; 天谷 健一*; 芳賀 芳範; 日高 宏之*; 柳澤 達也*; 網塚 浩*
Journal of the Physical Society of Japan, 80(Suppl.A), p.SA100_1 - SA100_3, 2011/07
被引用回数:1 パーセンタイル:87.43(Physics, Multidisciplinary)Low-temperature specific heat and static dc magnetization measurements have been performed in the superconducting state of the heavy-fermion compound UBe. The superconducting phase diagram was obtained from these measurements. We obtained Ginzburg-Landau parameter as a function of temperature and showed that a paramagnetic effect is present down to 0.5 K.
柳澤 達也*; 立岩 尚之; 真山 太一*; 齋藤 旬*; 日高 宏之*; 網塚 浩*; 芳賀 芳範; 根本 祐一*; 後藤 輝孝*
Journal of the Physical Society of Japan, 80(Suppl.A), p.SA105_1 - SA105_3, 2011/07
被引用回数:3 パーセンタイル:69.39(Physics, Multidisciplinary)Ultrasonic measurements of UPd
Si
were performed in order to investigate elastic properties of the cage-structured compound U
Pd
Si
. At temperatures over antiferromagnetic ordering at
= 19 K, neither an up-turn anomaly nor frequency dependence of the elastic constants, regarding the ultrasonic dispersion (UD), was found. A drastic change of
mode at
, in particular, implies a strong magneto-elastic coupling of 5
-electrons or a possible contribution of a ferroquadrupole interaction to the antiferromagnetism in U
Pd
Si
.
清水 悠晴*; 池田 陽一*; 若林 琢巳*; 天谷 健一*; 芳賀 芳範; 日高 宏之*; 柳澤 達也*; 網塚 浩*
Journal of Physics; Conference Series, 273, p.012084_1 - 012084_4, 2011/02
被引用回数:3 パーセンタイル:31.8Static dc magnetization measurements in the superconducting mixed state of a single crystal UBe were performed by means of a capacitance Faraday-force method down to 0.24 K. Below the upper critical field
, not only a peak effect but also an additional broad anomaly have been observed in magnetization curves. We report superconducting phase diagram of UBe
obtained by our magnetization measurements, including these anomalies.