Fermi surface changes across the Néel phase boundary of NdB6.
Fermi surface changes across the Néel phase boundary of NdB6.
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费米面在 NdB6 的尼尔相界上发生变化。
DOI：
10.1103/physrevlett.97.146404
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发表时间：
2006
影响因子：
8.6
通讯作者：
Z. Fisk
中科院分区：
文献类型：
--
作者：
R. Goodrich;N. Harrison;Z. Fisk
我们报道了在NDB6的反铁磁区和顺磁区的De Haas-van Alphen测量，当磁场平行于[001]时，这两个区被一个二阶上临界场分开，H_(C)的反铁磁序约为30T。费米面在相变过程中的变化为系统提供了一个理想的例子，在该系统中，一维磁周期势对单位晶胞加倍的影响(如斯莱特最初预测的那样)。Rev.82,538(1951)])可以只通过改变磁场来调谐。顺磁相内的费米面类似于LaB6等其他六硼化物的费米面，但具有额外的交换分裂效应和弱关联。
We report de Haas-van Alphen measurements in both the antiferromagetic and paramagnetic regimes of NdB6, which are shown to be separated by a second order upper critical field for antiferromagnetic ordering of H_{c} approximately 30 T when the magnetic field is parallel to [001]. The Fermi surface changes across the transition provide an ideal example of a system in which the effect of a one-dimensional magnetic periodic potential on doubling the unit cell (as originally predicted by Slater [Phys. Rev. 82, 538 (1951)]) can be tuned by varying only the magnetic field. The Fermi surface within the paramagnetic phase resembles that observed in other hexaborides such as LaB6 but with additional exchange splitting effects and weak correlations.