title: Pressure-induced valence crossover and novel metamagnetic behavior near the antiferromagnetic quantum phase transition of YbNi_{3}Ga_{9}.
abstract: We report electrical resistivity, ac magnetic susceptibility, and x-ray absorption spectroscopy measurements of intermediate valence YbNi_{3}Ga_{9} under pressure and magnetic field. We have revealed a characteristic pressure-induced Yb valence crossover within the temperature-pressure phase diagram, and a first-order metamagnetic transition is found below P_{c}∼9  GPa where the system undergoes a pressure-induced antiferromagnetic transition. As a possible origin of the metamagnetic behavior, a critical valence fluctuation emerging near the critical point of the first-order valence transition is discussed on the basis of the temperature-field-pressure phase diagram.
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Matsubayashi
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hirayama
authors.affiliation: Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamashita
authors.affiliation: Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ohara
authors.affiliation: Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kawamura
authors.affiliation: Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Mizumaki
authors.affiliation: Department of Physical Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Ishimatsu
authors.affiliation: Quantum Physics Section, Kyushu Institute of Technology, Fukuoka 804-8550, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Watanabe
authors.affiliation: Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kitagawa
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Uwatoko