Angular Dependent Torque Measurements on CeCoIn${}_5$ Single Crystals

Abstract

Angular dependent torque measurements were performed on single crystals of CeCoIn${}_5$, a heavy fermion superconductor ($T_{c0}$ = 2.3 K), in the temperature, $T$, range 1.9 K $\le T\le$ 20 K and magnetic fields $H$ up to 14 T. A large paramagnetic effect is found in the normal state. Torque measurements in the mixed state were also performed. The torque curves show sharp hysteresis peaks at $\theta =90^o$ ($\theta$ is the angle between $H$ and the $c-$axis of the crystal), a result of intrinsic pinning of vortices. The anisotropy $\gamma \equiv \sqrt{m_c/m_a}$ in the mixed state was determined from the reversible part of the vortex contribution to the torque signal using Kogan's model [Phys. Rev. B \textbf{38}, 7049 (1988)]. The anisotropy $\gamma$ decreases with increasing magnetic field and temperature. The fact that $\gamma$ is not a constant points towards a multiband scenario in this heavy fermion material.

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Cited by in corpus (8)

• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• Spin-flop transition and magnetic phase diagram in CaCo${}_2$As${}_2$ revealed by torque measurements
• Pairing Symmetry of CeCoIn${}_5$ Detected by In-plane Torque Measurements
• Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdoped SmBa2Cu3Ox
• Anomalous Paramagnetic Magnetization in Mixed State of CeCoIn${}_5$ single crystals
• Magnetic anisotropy in uranium monosulfide, probed by the magnetic torque measurements
• Vortex lock-in transition and evidence for transitions among commensurate kinked vortex configurations in single-layered Fe arsenides
• Nonlinear paramagnetic magnetization in the mixed state of CeCoIn_5