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首页> 外文期刊>Physical Review X >Antiferromagnetic and Orbital Ordering on a Diamond Lattice Near Quantum Criticality
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Antiferromagnetic and Orbital Ordering on a Diamond Lattice Near Quantum Criticality

机译：接近量子临界的金刚石晶格上的反铁磁和轨道有序

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We present neutron scattering measurements on powder samples of the spinel FeSc 2 S 4 that reveal a previously unobserved magnetic ordering transition occurring at 11.8(2)?K. Magnetic ordering occurs subsequent to a subtle cubic-to-tetragonal structural transition that distorts Fe coordinating sulfur tetrahedra and lifts the orbital degeneracy. The orbital ordering is not truly long ranged, but occurs over finite-sized domains that limit magnetic correlation lengths. The application of 1?GPa hydrostatic pressure appears to destabilize this Néel state, reducing the transition temperature to 8.6(8)?K and redistributing magnetic spectral weight to higher energies. The relative magnitudes of ordered ? m ? 2 = 3.1 ( 2 ) μ B 2 and fluctuating moments ? δ m ? = 13 ( 1 ) μ B 2 show that the magnetically ordered state of FeSc 2 S 4 is drastically renormalized and close to criticality.
机译：我们对尖晶石FeSc 2 S 4的粉末样品进行中子散射测量，揭示了以前未观察到的发生在11.8（2）？K的磁有序转变。磁有序发生在微妙的立方到四方结构转变之后，该结构转变使铁配位的硫四面体扭曲并提升了轨道的简并性。轨道排序并不是真正的远距离，而是发生在限制磁相关长度的有限尺寸域上。 1？GPa静水压力的施加似乎使这种Néel态不稳定，将转变温度降低到8.6（8）？K，并将磁谱权重重新分配给更高的能量。有序相对幅度米2 = 3.1（2）μB 2和波动力矩？ δm？ = 13（1）μB 2表明，FeSc 2 S 4的磁有序态被彻底地归一化并且接近临界。

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