Abstract
Sr4(Ru0.99Fe0.01)3O10 shows a ferromagnetic (FM) transition at TC ∼ 105 K with the magnetic easy axis in the ab plane, followed by a metamagnetic transition (MMT) at low temperatures when the magnetic field H is applied along the c axis, which is in sharp contrast to that of the pure Sr4Ru3O10, where the easy axis is along the c axis and the MMT is in the ab plane. Here, we studied the MMT in the Sr4(Ru0.99Fe0.01)3O10 nanosheet by the Hall effect. It was found that the ordinary Hall coefficient of Sr4(Ru0.99Fe0.01)3O10 is almost the same as that of the pure Sr4Ru3O10, while a sudden increase in the Hall resistance Rxy is observed below ∼50 K, above which the Rxy presents the conventional anomalous Hall effect up to TC. Analysis of the results indicates that the MMT has no direct correlation to the electronic structure but closely relates to the magnetic moment locking, where the magnetic-field-induced breakdown of the locked moments is responsible for the MMT.
Highlights
IntroductionThe n = 3 member Sr4Ru3O10 is an exotic ferromagnetic (FM) metal (Crawford et al, 2002)
The 4d-electron-based perovskite ruthenium oxides Srn+1RunO3n+1 (n = 1, 2, ∞) with a strong inherent spin orbital coupling present rich and fascinating phenomena, such as unconventional superconductivity (Sr2RuO4, n = 1) (Mackenzie and Maeno, 2003), magnetic-field-tuned metamagnetic quantum criticality (Sr3Ru2O7, n = 2) (Grigera et al, 2001), and itinerant ferromagnetism (SrRuO3, n = ∞) (Koster et al, 2012)
An anomaly of the resistance near TC ~ 105 K can be identified due to the FM transition, but no second anomaly at TM is seen, which is in sharp contrast to that observed in the pure Sr4Ru3O10 bulk or nanosheets, where two resistive anomalies at TC and TM can be found (Liu et al, 2018; Liu et al, 2017)
Summary
The n = 3 member Sr4Ru3O10 is an exotic ferromagnetic (FM) metal (Crawford et al, 2002). It possesses an orthorhombic unit cell composed of triple layers of corner-shared RuO6 octahedra separated by double rock-salt Sr-O layers. Sr4Ru3O10 undergoes an FM transition at a Curie temperature TC ~ 105 K with the easy axis along the c axis, followed by a second transition at a critical temperature TM ~ 50 K (Crawford et al, 2002; Cao et al, 2003). TM, a superlinear increase of magnetization, i.e., a metamagnetic transition (MMT), is observed when the magnetic field is applied in the ab plane (Cao et al, 2003)
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