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Journal Articles

Local atomic displacements and sign of the structural transformation in medium-entropy alloys observed in extended X-ray absorption fine structure spectra

Ikeda, Yoichi*; Umemoto, Yoshihiko*; Matsumura, Daiju; Tsuji, Takuya; Hashimoto, Yuki*; Kitazawa, Takafumi*; Fujita, Masaki*

Materials Transactions, 64(9), p.2254 - 2260, 2023/09

Journal Articles

Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy (Lu,Yb)Rh$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Ikeda, Yoichi*; Sakakibara, Toshiro*; Matsuo, Akira*; Shimizu, Yusei*; Tokunaga, Yo; Haga, Yoshinori; Kindo, Koichi*; Nambu, Yusuke*; Ikeuchi, Kazuhiko*; et al.

Physical Review B, 108(8), p.085105_1 - 085105_7, 2023/08

Journal Articles

Molecular magnetism in neptunyl(+1,+2) complexes; $$^{237}$$Np-M$"o$ssbauer and magnetic study

Nakamura, Akio; Nakada, Masami; Nakamoto, Tadahiro*; Kitazawa, Takafumi*; Takeda, Masuo*

Journal of Alloys and Compounds, 444-445, p.621 - 633, 2007/10

 Times Cited Count:3 Percentile:28.19(Chemistry, Physical)

no abstracts in English

Journal Articles

Magnetic property of neptunyl (+2) complex NpO$$_{2}$$(C$$_{6}$$H$$_{7}$$O$$_{2}$$)$$_{2}$$(C$$_{5}$$H$$_{5}$$N)

Nakamura, Akio; Nakada, Masami; Nakamoto, Tadahiro*; Kitazawa, Takafumi*; Takeda, Masuo*

Journal of Magnetism and Magnetic Materials, 310(2, Part2), p.1447 - 1449, 2007/03

Magnetic property of a nitrogen (N)-coordinated neptunyl (+2) (Np(VI)) complex. 1 NpO$$_{2}$$(acac)$$_{2}$$(py) (acac=C$$_{6}$$H$$_{7}$$O$$_{2}$$, py=C$$_{5}$$H$$_{5}$$N) was studied by DC magnetization (M) measurements. While previous $$^{237}$$Np M$"o$ssbauer data of 1 exhibited para magnetic-relaxation spectra similar to other oxo-neptunyls (+1,+2), the DC-$$M$$ data have revealed many strikingly different features of 1 from the latter: first, its reciprocal susceptibility ($$chi$$$$^{-1}$$) vs. $$T$$(K) plots showed a peculiar strongly field ($$H$$)-dependent nonparamagnetic behavior, which suggests the presence of small ferromagnetic component with $$T$$$$_{C}$$$$>$$300 K. In addition, its low-temperature isothermal $$M$$ exhibited anomalous relaxation behavior involving initial over-responsive $$M$$ change and subs equent drift back to its "equilibrium" value ($$M$$$$_{rm eq}$$). Moreover, such $$M$$$$_{rm eq}$$ showed strong perturbation effect from the SQUID-$$M$$ measurement itself. Such novel magnetic features suggest the presence of a largely metastable fluctuating magnetic (spin plus orbital) state in 1 as a collective body of individual Ising-type neptunyl (O=Np=O)$$^{+2}$$ molecular magnets.

Journal Articles

Revaluation of the correlation of isomer shift with Np-O bond length in various neptunyl(V and VI) compounds

Saeki, Masakatsu; Nakada, Masami; Kawasaki, Takeshi*; Nishimura, Tatsuru*; Kitazawa, Takafumi*; Takeda, Masuo*

Journal of Radioanalytical and Nuclear Chemistry, 270(2), p.379 - 384, 2006/11

 Times Cited Count:3 Percentile:24.14(Chemistry, Analytical)

no abstracts in English

Journal Articles

Molecular magnetism of neptunyl (+2) complex NpO$$_{2}$$(C$$_{6}$$H$$_{7}$$O$$_{2}$$)$$_{2}$$(C$$_{5}$$H$$_{5}$$N)

Nakamura, Akio; Nakada, Masami; Nakamoto, Tadahiro*; Kitazawa, Takafumi*; Takeda, Masuo*

Journal of the Physical Society of Japan, 75(Suppl.), p.146 - 148, 2006/08

no abstracts in English

Journal Articles

Relationship between M$"o$ssbauer Isomer shifts and Structures of Neptunium compounds

Saeki, Masakatsu; Nakada, Masami; Kitazawa, Takafumi*

KURRI-KR-106, p.38 - 42, 2004/03

no abstracts in English

Journal Articles

A New type of neptunyl(VI) hydroxide which is topologically similar to $$alpha$$-UO$$_{2}$$(OH)$$_{2}$$

Nakada, Masami; Kitazawa, Takafumi*; Saito, Takashi*; Wang, J.*; Takeda, Masuo*; Yamashita, Toshiyuki; Saeki, Masakatsu

Bulletin of the Chemical Society of Japan, 76(7), p.1375 - 1378, 2003/07

 Times Cited Count:6 Percentile:30.06(Chemistry, Multidisciplinary)

no abstracts in English

Oral presentation

Pulsed high field measurements in quasi-degenerate diluted Yb systems (Lu,Yb)Rh$$_{2}$$Zn$$_{20}$$

Kitazawa, Takafumi; Haga, Yoshinori

no journal, , 

no abstracts in English

Oral presentation

High magnetic field specific heat of a quasi-degenerate Kondo alloy (Lu, Yb)Rh$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Ikeda, Yoichi*; Imajo, Shusaku*; Haga, Yoshinori; Kohama, Yoshimitsu*; Tokunaga, Yo; Fujita, Masaki*

no journal, , 

no abstracts in English

Oral presentation

Investigation of the multiorbital Kondo effect in a 5f-electron compound (Lu,U)Ru$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Tokunaga, Yo; Haga, Yoshinori; Opletal, P.; Sakai, Hironori; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Ikeda, Yoichi*; Fujita, Masaki*

no journal, , 

Oral presentation

Investigation of the multiorbital Kondo effect in a uranium compound Lu$$_{1-x}$$U$$_x$$Rh$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Tokunaga, Yo; Haga, Yoshinori; Opletal, P.; Sakai, Hironori; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Ikeda, Yoichi*; Fujita, Masaki*

no journal, , 

no abstracts in English

12 (Records 1-12 displayed on this page)
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