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Pairing symmetry of CeCoIn_5 detected by in-plane torque measurements

机译:通过面内扭矩测量检测到CeCoIn_5的配对对称性

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摘要

In-plane torque measurements were performed on heavy fermion CeCoIn_5 single crystals in the temperature T range 1.8 K ≤ T ≤ 10 K and applied magnetic field H up to 14 T. The normal-state torque is given by τ_n ∝H~4(1+T/T_k)~(-1) sin 4φ. The reversible part of the mixed-state torque, obtained after subtracting the corresponding normal-state torque, shows also a fourfold symmetry. In addition, sharp peaks are present in the irreversible torque at angles of π/4, 3π/4, 5π/4, tπ/4, etc. Both the fourfold symmetry in the reversible torque and the sharp peaks in the irreversible torque of the mixed state imply d_(xy) symmetry of the superconducting order parameter. The field and temperature dependences of the reversible mixed-state torque provide further evidence for d_(xy) wave symmetry. The fourfold symmetry in the normal state has a different origin since it has different field and temperature dependences than the one in the mixed state. The possible reasons of the normal-state fourfold symmetry are discussed.
机译:在温度T范围为1.8 K≤T≤10 K且施加磁场H高达14 T的重型费米子CeCoIn_5单晶上进行了面内扭矩测量。正常状态扭矩由τ_n∝H〜4(1 + T / T_k)〜(-1)sin4φ。减去相应的正常状态扭矩后获得的混合状态扭矩的可逆部分也显示了四重对称性。此外,在不可逆扭矩中,在π/ 4、3π / 4、5π / 4,tπ/ 4等角度处存在尖峰。可逆扭矩中的四重对称性和不可逆扭矩中的尖峰都存在。混合状态意味着超导阶参数的d_(xy)对称。可逆混合状态转矩的场和温度相关性为d_(xy)波对称性提供了进一步的证据。正常状态下的四重对称性具有不同的起源,因为它与混合状态下的对称性具有不同的场和温度依赖性。讨论了正常态四重对称的可能原因。

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