Magnetic phase transitions and bulk spin-valve effect tuned by in-plane field orientation in Ca3Ru2O7

被引：10
作者：
Fobes, D. [1 ]
Peng, J. [1 ]
Qu, Z. [1 ]
Liu, T. J. [1 ]
Mao, Z. Q. [1 ]
机构：
[1] Tulane Univ, Dept Phys, New Orleans, LA 70118 USA
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 01期
关键词：
INSULATOR-TRANSITION; QUANTUM CRITICALITY; SUPERCONDUCTIVITY; SR2RUO4; CA2-XSRXRUO4; SR3RU2O7; CHARGE; METAL;
D O I：
10.1103/PhysRevB.84.014406
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have performed systematic in-plane angle-dependent c-axis transverse magnetotransport measurements on the double-layered ruthenate Ca3Ru2O7 throughout a broad field and temperature range. Our results reveal that the magnetic states unusually evolve with in-plane rotation of magnetic field. When magnetic field is applied along the b axis, we probe crossover magnetic states in close proximity to phase boundaries of long-range ordered antiferromagnetic states. These crossover magnetic states are characterized by short-range antiferromagnetic order and switch to polarized paramagnetic states at critical angles as the in-plane field is rotated from the b to the a axis. Additionally, we observe bulk spin-valve behavior resulting from spin-flop transitions tuned by in-plane rotation of magnetic field. Our results highlight the complex nature of the spin-charge coupling in Ca3Ru2O7 and posts a challenging question: why does the change of magnetic-field orientation result in magnetic phase transitions.
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页数：8
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