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Nature Physics 3 (2007) 29-35 .

Yasutomo J. Uemura, Columbia University, Inter-American Materials Collaboration, DMR 0502706 (MWN-CIAM).

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Nature Physics 3 (2007) 29-35 .

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  1. Yasutomo J. Uemura, Columbia University, Inter-American Materials Collaboration, DMR 0502706 (MWN-CIAM) With collaborators from Argentine, Brazil, Canada, Germany, Japan and the US, the Uemura group performed Muon Spin Relaxation studies of itinerant electron heli/ferro- magnets, and demonstrated spontaneous phase separation and suppression of critical behavior at quantum phase transitions. Attached figures show the pressure-temperature phase diagram of MnSi and the mSR results near the helical-paramagnet phase boundary. Nature Physics 3 (2007) 29-35. MnSi MnSi helical para

  2. Yasutomo J. Uemura, Columbia Univ. Inter-American Materials Collaboration DMR 0502706 (MWN-CIAM) International Collaboration, Human Resource Development, Educational Contribution, Out-reach The mSR experiments have been performed at the Canadian National Accelerator Laboratory TRIUMF. Graduate Students from Columbia (US), McMaster (Canada), CBPF (Brazil), and Kyoto (Japan), have participated in the data-taking collaboration at TRIUMF, together with two undergrad students from Columbia and a high-school student from New York. Two Workshops of the CIAM collaborators and relevant local scientists were held: first in Rio, Brazil in May 2006, attended by 35 Brazilian scientists and students and several North American visitors; and then at TRIUMF, Vancouver, Canada, in June 2007, attended by several Latin American visitors and about 30 scientists from Canada, US and Japan. A graduate student Peter Russo of Columbia, supported by this project, completed his PhD with mSR studies in Bi2201 high Tc superconductors in the end of 2005, and has been employed as a post-doc at TRIUMF since January 2006. A graduate student Jeremy Carlo is currently working on the project of quantum phase transitions. As a part of general contributions to education activities, Internet-based lectures using power point files recorded with voice and animation actions have been developed by Uemura, who is teaching a solid state physics course for undergraduate students at Columbia. The lectures will be used by a Brazilian university as a supplemental teaching material available for students. A sample lecture can be seen at http://www.columbia.edu/~yu2 Internet-based seminars using the same technology will be started soon, connecting Argentine, Brazil, Canada, and the US. A mSR spectrometer at TRIUMF used in the studies of quantum phase transitions A Brazilian graduate student giving a talk at the CIAM group meeting held in Rio, Brazil in 2006.

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