Cameron A S, Tymoshenko Y V, Portnichenko P Y, Gavilano J, Tsurkan V, Felea V, Loidl A, Zherlitsyn S, Wosnitza J, Inosov D S
Institut für Festkörperphysik, TU Dresden, D-01069 Dresden, Germany.
J Phys Condens Matter. 2016 Apr 13;28(14):146001. doi: 10.1088/0953-8984/28/14/146001. Epub 2016 Mar 11.
We performed small-angle neutron scattering (SANS) measurements on the helimagnetic spinel compound ZnCr2Se4. The ground state of this material is a multi-domain spin-spiral phase, which undergoes domain selection in a magnetic field and reportedly exhibits a transition to a proposed spin-nematic phase at higher fields. We observed a continuous change in the magnetic structure as a function of field and temperature, as well as a weak discontinuous jump in the spiral pitch across the domain-selection transition upon increasing field. From our SANS results we have established the absence of any long-range magnetic order in the high-field (spin-nematic) phase. We also found that all the observed phase transitions are surprisingly isotropic with respect to the field direction.
我们对螺旋磁性尖晶石化合物ZnCr2Se4进行了小角中子散射（SANS）测量。这种材料的基态是多畴自旋螺旋相，在磁场中会发生畴选择，据报道在更高磁场下会转变为一种推测的自旋向列相。我们观察到磁结构随磁场和温度的连续变化，以及在增加磁场时跨畴选择转变的螺旋间距的微弱不连续跳跃。从我们的小角中子散射结果来看，我们确定在高场（自旋向列）相中不存在任何长程磁有序。我们还发现，所有观察到的相变相对于磁场方向都出奇地各向同性。
