Order–disorder phase transition and elastic-to-plastic vortex creep crossover in a triclinic iron pnictide superconductor (Ca0.85 La0.15 )10 (Pt3 As8 )(Fe2As2 )5

Shyam Sundar; P. V. Lopes; S. Salem-Sugui; Z.-Z. Li; W.-S. Hong; H.-Q. Luo; S.-L. Li; L. Ghivelder

doi:10.1038/s41598-023-43424-z

Order–disorder phase transition and elastic-to-plastic vortex creep crossover in a triclinic iron pnictide superconductor (Ca_0.85La_0.15 )₁₀ (Pt₃ As₈ )(Fe₂As₂ )₅

Shyam Sundar^*, P. V. Lopes, S. Salem-Sugui, Z.-Z. Li, W.-S. Hong, H.-Q. Luo, S.-L. Li, L. Ghivelder

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Vortex matter in layered high-T_c superconductors, including iron-pnictides, undergo several thermodynamic phase transitions due to the complex interplay of pinning energy, thermal energy and elastic energy. Moreover, the presence of anisotropy makes their vortex physics even more intriguing. Here, we report a detailed vortex dynamics study, using dc magnetization measurements, in a triclinic iron-pnictide superconductor (Ca_0.85La_0.15)₁₀(Pt₃As₈)(Fe₂As₂)₅, with a superconducting transition temperature, T_c∼ 31 K. A second magnetization peak (SMP) feature is observed for magnetic field perpendicular (H‖c) and parallel (H‖ab) to the crystal plane. However, its fundamental origin is quite different in both directions. For H‖c, the SMP can be well explained using an elastic-to-plastic vortex creep crossover, using collective creep theory. In addition, a possible rhombic-to-square vortex lattice phase transition is also observed for fields in between the onset-field and peak-field related to the SMP. On the other hand, for H‖ab, a clear signature of an order-disorder vortex phase transition is observed in the isothermal M(H) measurements at T≥ 6 K. The disordered phase exhibits the characteristics of entangled pinned vortex-liquid. We construct a comprehensive vortex phase diagram by displaying characteristic temperatures and magnetic fields for both crystal geometries in this unique superconducting compound. Our study sheds light on the intricate vortex dynamics and pinning in an iron-pnictide superconductor with triclinic symmetry.

Original language	English
Article number	16273
Number of pages	13
Journal	Scientific Reports
Volume	13
DOIs	https://doi.org/10.1038/s41598-023-43424-z
Publication status	Published - 28 Sept 2023

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@article{85b264cc4d9040d1a77272f00319804c,

title = "Order–disorder phase transition and elastic-to-plastic vortex creep crossover in a triclinic iron pnictide superconductor (Ca0.85 La0.15 )10 (Pt3 As8 )(Fe2As2 )5",

abstract = "Vortex matter in layered high-Tc superconductors, including iron-pnictides, undergo several thermodynamic phase transitions due to the complex interplay of pinning energy, thermal energy and elastic energy. Moreover, the presence of anisotropy makes their vortex physics even more intriguing. Here, we report a detailed vortex dynamics study, using dc magnetization measurements, in a triclinic iron-pnictide superconductor (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5, with a superconducting transition temperature, Tc∼ 31 K. A second magnetization peak (SMP) feature is observed for magnetic field perpendicular (H‖c) and parallel (H‖ab) to the crystal plane. However, its fundamental origin is quite different in both directions. For H‖c, the SMP can be well explained using an elastic-to-plastic vortex creep crossover, using collective creep theory. In addition, a possible rhombic-to-square vortex lattice phase transition is also observed for fields in between the onset-field and peak-field related to the SMP. On the other hand, for H‖ab, a clear signature of an order-disorder vortex phase transition is observed in the isothermal M(H) measurements at T≥ 6 K. The disordered phase exhibits the characteristics of entangled pinned vortex-liquid. We construct a comprehensive vortex phase diagram by displaying characteristic temperatures and magnetic fields for both crystal geometries in this unique superconducting compound. Our study sheds light on the intricate vortex dynamics and pinning in an iron-pnictide superconductor with triclinic symmetry.",

author = "Shyam Sundar and Lopes, {P. V.} and S. Salem-Sugui and Z.-Z. Li and W.-S. Hong and H.-Q. Luo and S.-L. Li and L. Ghivelder",

note = "Funding: PVL is supported by an M.Sc. grant from Conselho Nacional de Desenvolvimento Cient{\'i}fco e Tecnol{\'o}gico (CNPq). LG was supported by Funda{\c c}{\~a}o Carlos Chagas Filho de Amparo {\`a} Pesquisa do Estado do Rio de Janeiro (FAPERJ), Projects E-26/010.001497/2019, E-26/211.270/2021, and E-26/200.964/2022, and CNPq, project 308899/2021-0. This work is also supported by the National Key Research and Development Program of China (Grant No. 2018YFA0704200), the Strategic Priority Research Program (B) of the CAS (Grants Nos. XDB25000000), the National Natural Science Foundation of China (Grant Nos. 11822411 and 11961160699), and the Youth Innovation Promotion Association of CAS (Grant No. Y202001). W.S.H. was supported by the Postdoctoral Innovative Talent program (Grant No. BX2021018), and the China Postdoctoral Science Foundation (Grant No. 2021M700250).",

year = "2023",

month = sep,

day = "28",

doi = "10.1038/s41598-023-43424-z",

language = "English",

volume = "13",

journal = "Scientific Reports",

issn = "2045-2322",

publisher = "Nature publishing group",

}

TY - JOUR

T1 - Order–disorder phase transition and elastic-to-plastic vortex creep crossover in a triclinic iron pnictide superconductor (Ca0.85 La0.15 )10 (Pt3 As8 )(Fe2As2 )5

AU - Sundar, Shyam

AU - Lopes, P. V.

AU - Salem-Sugui, S.

AU - Li, Z.-Z.

AU - Hong, W.-S.

AU - Luo, H.-Q.

AU - Li, S.-L.

AU - Ghivelder, L.

N1 - Funding: PVL is supported by an M.Sc. grant from Conselho Nacional de Desenvolvimento Científco e Tecnológico (CNPq). LG was supported by Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Projects E-26/010.001497/2019, E-26/211.270/2021, and E-26/200.964/2022, and CNPq, project 308899/2021-0. This work is also supported by the National Key Research and Development Program of China (Grant No. 2018YFA0704200), the Strategic Priority Research Program (B) of the CAS (Grants Nos. XDB25000000), the National Natural Science Foundation of China (Grant Nos. 11822411 and 11961160699), and the Youth Innovation Promotion Association of CAS (Grant No. Y202001). W.S.H. was supported by the Postdoctoral Innovative Talent program (Grant No. BX2021018), and the China Postdoctoral Science Foundation (Grant No. 2021M700250).

PY - 2023/9/28

Y1 - 2023/9/28

N2 - Vortex matter in layered high-Tc superconductors, including iron-pnictides, undergo several thermodynamic phase transitions due to the complex interplay of pinning energy, thermal energy and elastic energy. Moreover, the presence of anisotropy makes their vortex physics even more intriguing. Here, we report a detailed vortex dynamics study, using dc magnetization measurements, in a triclinic iron-pnictide superconductor (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5, with a superconducting transition temperature, Tc∼ 31 K. A second magnetization peak (SMP) feature is observed for magnetic field perpendicular (H‖c) and parallel (H‖ab) to the crystal plane. However, its fundamental origin is quite different in both directions. For H‖c, the SMP can be well explained using an elastic-to-plastic vortex creep crossover, using collective creep theory. In addition, a possible rhombic-to-square vortex lattice phase transition is also observed for fields in between the onset-field and peak-field related to the SMP. On the other hand, for H‖ab, a clear signature of an order-disorder vortex phase transition is observed in the isothermal M(H) measurements at T≥ 6 K. The disordered phase exhibits the characteristics of entangled pinned vortex-liquid. We construct a comprehensive vortex phase diagram by displaying characteristic temperatures and magnetic fields for both crystal geometries in this unique superconducting compound. Our study sheds light on the intricate vortex dynamics and pinning in an iron-pnictide superconductor with triclinic symmetry.

AB - Vortex matter in layered high-Tc superconductors, including iron-pnictides, undergo several thermodynamic phase transitions due to the complex interplay of pinning energy, thermal energy and elastic energy. Moreover, the presence of anisotropy makes their vortex physics even more intriguing. Here, we report a detailed vortex dynamics study, using dc magnetization measurements, in a triclinic iron-pnictide superconductor (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5, with a superconducting transition temperature, Tc∼ 31 K. A second magnetization peak (SMP) feature is observed for magnetic field perpendicular (H‖c) and parallel (H‖ab) to the crystal plane. However, its fundamental origin is quite different in both directions. For H‖c, the SMP can be well explained using an elastic-to-plastic vortex creep crossover, using collective creep theory. In addition, a possible rhombic-to-square vortex lattice phase transition is also observed for fields in between the onset-field and peak-field related to the SMP. On the other hand, for H‖ab, a clear signature of an order-disorder vortex phase transition is observed in the isothermal M(H) measurements at T≥ 6 K. The disordered phase exhibits the characteristics of entangled pinned vortex-liquid. We construct a comprehensive vortex phase diagram by displaying characteristic temperatures and magnetic fields for both crystal geometries in this unique superconducting compound. Our study sheds light on the intricate vortex dynamics and pinning in an iron-pnictide superconductor with triclinic symmetry.

U2 - 10.1038/s41598-023-43424-z

DO - 10.1038/s41598-023-43424-z

M3 - Article

SN - 2045-2322

VL - 13

JO - Scientific Reports

JF - Scientific Reports

M1 - 16273

ER -

Order–disorder phase transition and elastic-to-plastic vortex creep crossover in a triclinic iron pnictide superconductor (Ca0.85 La0.15 )10 (Pt3 As8 )(Fe2As2 )5

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Order–disorder phase transition and elastic-to-plastic vortex creep crossover in a triclinic iron pnictide superconductor (Ca_0.85La_0.15 )₁₀ (Pt₃ As₈ )(Fe₂As₂ )₅