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MAGNETIC PHASE DIAGRAM OF YNI2B2C

机译:YNI2B2C的磁性相图

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Structurally, YNi2B2C is a layered material. However, measurements on a single crystal show no anisotropy in the magnetic response. Accordingly, we have determined the values of H-c1(T), H-r(T) and H-c2(T) (T-c=15.45 K) through detailed magnetisation and resistivity measurements using a polycrystalline sample. The values of the intrinsic parameters H-c1(O), H-c2(O), H-c(O), lambda(GL)(O), xi(GL)(0) and K-0 are estimated to be 220 Oe, 52 kOe, 1.8 kOe, 1630 Angstrom, 80 Angstrom and 20.4, respectively. The H-c1(T) data is found to conform to the quadratic relation H-c1(O)[1-(T/T-c)(2)] for T<14.4 K and above this temperature the fall is faster. The H-r(T) data fit to a power-law response, [1-(T/T-c)(1.6), and the H-c2(T) curve shows an unusual curvature, namely, a concave upward feature. Our sample is brittle and electron microscopy reveals that it could comprise weakly coupled grains. As a result, our sample exhibits intergranularity effects near T-c via the negative peak effect in field-cooled warm up data and asymmetry in the hysteresis loop recorded after trapping of flux. The deviation of H-c1(T) values from the quadratic behaviour near T-c and the concave upward feature in the H-c2 curve are viewed as the consequence of the presence of ''weak links'' as the temperature approaches T-c. [References: 63]
机译:在结构上,YNi2B2C是层状材料。但是,在单晶上进行的测量表明磁响应没有各向异性。因此,我们通过使用多晶样品进行详细的磁化和电阻率测量,确定了H-c1(T),H-r(T)和H-c2(T)(T-c = 15.45 K)的值。固有参数H-c1(O),H-c2(O),Hc(O),λ(GL)(O),xi(GL)(0)和K-0的值估计为220 Oe分别为52 kOe,1.8 kOe,1630埃,80埃和20.4。对于T <14.4 K,发现H-c1(T)数据符合二次关系H-c1(O)[1-(T / T-c)(2)],在此温度以上,下降速度更快。 H-r(T)数据适合幂律响应,[1-(T / T-c)(1.6),H-c2(T)曲线显示出异常的曲率,即向上凹的特征。我们的样品很脆,电子显微镜显示它可能包含弱耦合晶粒。结果,我们的样品通过场冷预热数据中的负峰值效应和在捕获通量后记录的磁滞回线中的不对称性,在T-c附近表现出晶间效应。 H-c1(T)值与T-c附近的二次行为和H-c2曲线中的凹向上特征的偏差被视为温度接近T-c时存在“弱连接”的结果。 [参考:63]

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