Gasparov V A, Sheikin I, Levy F, Teyssier J, Santi G
Institute of Solid State Physics RAS, Chernogolovka, 142432, Russian Federation.
Phys Rev Lett. 2008 Aug 29;101(9):097006. doi: 10.1103/PhysRevLett.101.097006. Epub 2008 Aug 28.
The de Haas-van Alphen (dHvA) effect in the cluster superconductor ZrB12 was studied by magnetic torque measurements in magnetic fields up to 28 T at temperatures down to 0.07 K. The dHvA oscillations due to orbits from the neck sections and "cubic box" of the Fermi surface were detected. The dHvA frequencies as well as the cyclotron effective masses were calculated using the full-potential linear muffin-tin orbitals method within the generalized gradient approximation. A comparison of the experimental and calculated cyclotron mass shows unusually large electron-phonon interaction on the neck (lambdaep=0.95) and box (lambdaep=1.07) sections of the Fermi surface on the Brillouin zone boundaries.
通过在高达28 T的磁场中、低至0.07 K的温度下进行磁转矩测量，研究了团簇超导体ZrB12中的德哈斯 - 范阿尔芬（dHvA）效应。检测到了来自费米面颈部区域和“立方盒”轨道的dHvA振荡。使用广义梯度近似下的全势线性 muffin-tin轨道方法计算了dHvA频率以及回旋有效质量。实验和计算得到的回旋质量的比较表明，在布里渊区边界处费米面的颈部（λep = 0.95）和盒部（λep = 1.07）存在异常大的电子 - 声子相互作用。
