Magnetization hysteresis and time decay measurements in FeSe<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mrow></mrow><mrow><mn>0.50</mn></mrow></msub></math></span>Te<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mrow></mrow><mrow><mn>0.50</mn></mrow></msub></math></span>: Evidence for fluctuation in mean free path induced pinning

P. Das; Ajay D. Thakur; Anil K. Yadav; C. V. Tomy; M. R. Lees; G. Balakrishnan; S. Ramakrishnan; A. K. Grover

doi:10.1103/PhysRevB.84.214526

Magnetization hysteresis and time decay measurements in FeSe $_{0.50}$ Te $_{0.50}$ : Evidence for fluctuation in mean free path induced pinning

P. Das^1,2,3, Ajay D. Thakur^1,*, Anil K. Yadav¹, C. V. Tomy¹, M. R. Lees⁴, G. Balakrishnan⁴, S. Ramakrishnan², and A. K. Grover²

¹Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, India
²DCMP&MS, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
³Institute of Materials Science, The University of Tsukuba, 1-1-1, Tennodai, Ibaraki 305-8573, Japan
⁴Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom

^*Corresponding author: ajay.thakur@iitp.ac.in, adthakur@gmail.com; present address: Assistant Professor, School of Basic Sciences, Indian Institute of Technology Patna, Patliputra, Patna 800013, India.

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Phys. Rev. B 84, 214526 – Published 29 December, 2011

DOI: https://doi.org/10.1103/PhysRevB.84.214526

Abstract

We present results of magnetic measurements relating to vortex phase diagram in a single crystal of FeSe $_{0.5}$ Te $_{0.5}$ which displays a second magnetization peak anomaly for $H ∥ c$ . The possible role of the crystalline anisotropy on vortex pinning is explored via magnetic torque magnetometry. We present evidence in favor of pinning related to spatial variations of the charge carrier mean free path leading to small bundle vortex pinning by randomly distributed (weak) pinning centers for both $H ∥ c$ and $H ⊥ c$ . This is further corroborated using magnetization data for $H ∥ c$ in a single crystal of FeSe $_{0.35}$ Te $_{0.65}$ . Dynamical response across the second magnetization peak (SMP) anomaly in FeSe $_{0.5}$ Te $_{0.5}$ has been compared with that across the well-researched phenomenon of peak effect (PE) in a single crystal of CeRu $_{2}$ .

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Magnetization hysteresis and time decay measurements in FeSe $_{0.50}$ Te $_{0.50}$ : Evidence for fluctuation in mean free path induced pinning

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Magnetization hysteresis and time decay measurements in FeSe0.50Te0.50: Evidence for fluctuation in mean free path induced pinning

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Magnetization hysteresis and time decay measurements in FeSe $_{0.50}$ Te $_{0.50}$ : Evidence for fluctuation in mean free path induced pinning