title: High magnetic field phase diagram in electron-doped manganites La(0.4)Ca(0.6)Mn(1-y)Cr(y)O3.
abstract: We report the charge-order to ferromagnetic phase transition induced by pulsed high magnetic field and impurity doping effects in manganites La(0.4)Ca(0.6)(Mn(1-y)Cr(y))O3 (0 ≤ y ≤ 0.2). Significant charge-order suppression and ferromagnetic tendency upon the Cr(3+)-doping are evidenced, and three different ground states are identified, namely the charge-order state, the phase separated state, and the spin-glass like state. Phase diagram in the H-y plane at 4.2 K is determined by the high magnetic field study, in which the charge-order and ferromagnetic phase boundary is clearly figured out. The critical magnetic field for melting the charge-order phase of La(0.4)Ca(0.6)MnO3 is revealed to reach up to 46 T at 4.2 K. Interestingly, distinct responses of the three states to the high magnetic field are observed, indicating the special physics regarding the charge order melting process in each state. The mechanism of the doping induced charge-order suppression and ferromagnetism promotion can be understood by the competition between the antiferromagnetic interaction of Cr-Mn and local enhancement of electron hopping by Cr(3+).
authors.affiliation: Department of Physics & Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Chengliang
authors.initials: C
authors.lastname: Lu
authors.affiliation: Department of Physics, Hubei University of Technology, Wuhan 430068, China.
authors.forename: Ni
authors.initials: N
authors.lastname: Hu
authors.affiliation: Department of Physics & Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.affiliation: Department of Physics & Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Shuangcheng
authors.initials: S
authors.lastname: Xia
authors.affiliation: Department of Physics & Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Haowen
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Physics & Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Physics & Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Zhengcai
authors.initials: Z
authors.lastname: Xia
authors.affiliation: Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China and Institute for Quantum Materials, Hubei Polytechnic University, Huangshi 435000, China.
authors.forename: Jun-Ming
authors.initials: JM
authors.lastname: Liu