Uniaxial-pressure control of magnetic phase transitions in a frustrated magnet CuFeGaO ( = 0, 0.018)

フラストレート磁性体CuFeGaO (=0, 0.018)での一軸圧による磁気相転移の制御

中島 多朗*; 満田 節生*; 高橋 慶一郎*; 吉冨 啓祐*; 増田 一也*; 金子 周史*; 本間 勇紀*; 小林 悟*; 北澤 英明*; 小坂 昌史*; 阿曽 尚文*; 上床 美也*; 寺田 典樹*; 脇本 秀一  ; 武田 全康  ; 加倉井 和久

Nakajima, Taro*; Mitsuda, Setsuo*; Takahashi, Keiichiro*; Yoshitomi, Keisuke*; Masuda, Kazuya*; Kaneko, Chikafumi*; Homma, Yuki*; Kobayashi, Satoru*; Kitazawa, Hideaki*; Kosaka, Masashi*; Aso, Naofumi*; Uwatoko, Yoshiya*; Terada, Noriki*; Wakimoto, Shuichi; Takeda, Masayasu; Kakurai, Kazuhisa

We have investigated effects of applied uniaxial pressure () on magnetic phase transitions in a triangular lattice antiferromagnet CuFeO (CFO) and a slightly Ga-substituted compound CuFeGaO (CFGO) with = 0.018 by spherical neutron polarimetry. In both of CFO and CFGO ( = 0.018), the application of significantly increases the transition temperature from the paramagnetic phase to a collinear incommensurate antiferromagnetic phase. This suggests that the application of breaks equilateral symmetry of the triangular lattice and partially relieves geometrical spin frustration, which generally suppresses long-range magnetic orderings. Thus we demonstrated that uniaxial pressure can be an effective tool to control magnetic phase transitions in frustrated magnets.