Effect of Mn substitution on superconductivity in iron selenide (Li, Fe)OHFeSe single crystals

Mao, Yixin; Li, Zi‐An; Zhou, Huan‐Qiang; Ma, Ming; Chai, Ke; Liu, Shaobo; Tian, Jinpeng; Huang, Yulong; Yuan, Jie; Zhou, Fang; Li, Jianqi; Jin, Kui; Dong, Xianlin; Zhao, Zhongxian

doi:10.1088/1674-1056/27/7/077405

Cited by 6 publications

(7 citation statements)

References 74 publications

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“…Moreover, one typical EELS pattern of Mn doped films is shown in Figure 1(c). The presence of L3.2 edges for Mn and Fe indicates that Mn ions are incorporated into the lattice of FeSe-11111 films, not left as impurities, which is consistent with the case of Mn-doped FeSe-11111 single crystals [21]. Because of the small difference in ionic sizes for Mn and Fe, it is expected that the incorporated Mn ions substitute for Fe ions at the crystallographic tetrahedral sites.…”

Section: Characterization Of Crystal Structure and Elemental Mnsupporting

confidence: 75%

Giant enhancement of critical current density at high field in superconducting (Li,Fe)OHFeSe films by Mn doping

Liu¹,

Yuan²,

Shen³

et al. 2019

Supercond. Sci. Technol.

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Critical current density (Jc) is one of the major limiting factors for high field applications of iron-based superconductors.Here, we report that Mn-ions are successfully incorporated into nontoxic superconducting (Li,Fe)OHFeSe films.Remarkably, the Jc is significantly enhanced from 0.03 to 0.32 MA/cm 2 under 33 T, and the vortex pinning force density monotonically increases up to 106 GN/m 3 , which is the highest record so far among all iron-based superconductors. Our results demonstrate that Mn incorporation is an effective method to optimize the performance of (Li,Fe)OHFeSe films, offering a promising candidate for high-field applications.Recently, elemental Mn has been incorporated into FeSe-11111 single crystals without obvious detriment to its Tc [20], which may provide an effective candidate. Moreover, iron-based superconductors in the form of films usually present a higher Jc than that of bulk samples [6,8].Therefore, it is worthy introducing transition metal ions into FeSe-11111 crystalline superconducting film for further optimization of their high-field performance.In this letter, we successfully introduced Mn-ions into a superconducting FeSe-11111 film synthesized through the so-called 2 matrix-assisted hydrothermal epitaxy (MHE) method [12]. A significant enhancement of Jc was observed in FeSe-11111 films by Mn-doping, increasing it tenfold from 0.03 to 0.32 MA/cm 2 under 33 T at 5 K. Remarkably, the vortex pinning force density (Fp) of Mndoped films monotonically increases to 106 GN/m 3 . To the best of our knowledge, this is the highest record so far among all iron-based superconducting systems. By analyzing Fp versus magnetic fields, we find the apparent enhancement of Jc in the Mn-doped FeSe-11111 film stems from the extra pinning centers induced by Mn doping. ExperimentsThe pure and Mn-doped FeSe-11111 films were synthesized via the MHE method that we developed [12]. The x-ray diffraction (XRD) experiments were carried out on a 9 kW Rigaku SmartLab X-ray diffractometer. The scanning electron microscope (SEM) and energy dispersive X-ray (EDX) spectroscopy measurements were performed on a Hitachi SU5000. The electron energy loss spectroscopy (EELS) data were acquired using a transmission electron microscope (ARM200F, JEOL Inc.) equipped with a Gatan Quantum ER 965 Imaging Filter. Electrical transport measurements within 9T were collected with the standard four-probe method on a Quantum Design PPMS-9 system. The values of Jc were obtained using the criteria of 1 μV on I-V curves and the parameters of bridge were characterized by SEM. The high-field experiments up to 33 T were performed on the Steady High Magnetic Field Facilities, High Magnetic Field Laboratory, CAS.

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Section: Characterization Of Crystal Structure and Elemental Mnsupporting

confidence: 75%

Giant enhancement of critical current density at high field in superconducting (Li,Fe)OHFeSe films by Mn doping

Liu¹,

Yuan²,

Shen³

et al. 2019

Supercond. Sci. Technol.

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“…After synthesis, we needed to determine the precise composition and crystallographic occupancy of all dopants. There has been multiple works to date on similar transition metal doping in the (LiOH)FeSe system, but none have been able to quantify the crystallographic location of the transition metal dopant [50][51][52][53] . The location of the transition metal dopant is incredibly important in the realization of different physical properties as superconductivity in the iron chalcogenide sys-tems is very sensitive to doping 4,49,54 .…”

Section: Hydrothermal Synthesis and Crystallographic Resultsmentioning

confidence: 99%

Long-range magnetic order in hydroxide-layer-doped (Li1−x−yFexMnyOD)FeSe

Wilfong

Zhou

Zheng

et al. 2020

Phys. Rev. Materials

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The (Li1−xFexOH)FeSe superconductor has been suspected to exhibit long-range magnetic ordering due to Fe substitution in the LiOH layer. However, no direct observation such as magnetic reflection from neutron diffraction has be reported. Here, we use a chemical design strategy to manipulate the doping level of transition metals in the LiOH layer to tune the magnetic properties of the (Li1−x−yFexMnyOD)FeSe system. We find Mn doping exclusively replaces Li in the hydroxide layer resulting in enhanced magnetization in the (Li0.876Fe0.062Mn0.062OD)FeSe superconductor without significantly altering the superconducting behavior as resolved by magnetic susceptibility and electrical/thermal transport measurements. As a result, long-range magnetic ordering was observed below 12 K with neutron diffraction measurements. This work has implications for the design of magnetic superconductors for the fundamental understanding of superconductivity and magnetism in the iron chalcogenide system as well as exploitation as functional materials for next generation devices. arXiv:1912.09329v1 [cond-mat.supr-con]

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“…It is worth mentioning that the present results of the films are different from the previous observations of TMdoped (Li,Fe)OHFeSe single crystals obtained by a hydrothermal ion-exchange method, [5] in which the TM doping into the FeSe layers has been reported. [26,27,36] A possible reason for that is the more limited lattice tolerance of the epitaxial films than the single crystals, due to the presence of substrate in the film growth.…”

Section: Methodsmentioning

confidence: 99%

“…Previous results have shown that the Mn doping can affect the superconducting critical temperature (T c ) to certain extent in the (Li,Fe)OHFeSe single crystals. [26][27][28] It is desirable to further study the interplay between the interlayer doping of various TMs and the superconductivity in the (Li,Fe)OHFeSe system.…”

Section: Introductionmentioning

confidence: 99%

Doping effects of transition metals on the superconductivity of (Li,Fe)OHFeSe films*

Dong

Shen

et al. 2021

Chinese Phys. B

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The doping effects of transition metals (TMs = Mn, Co, Ni, and Cu) on the superconducting critical parameters are investigated in the films of iron selenide (Li,Fe)OHFeSe. The samples are grown via a matrix-assisted hydrothermal epitaxy method. Among the TMs, the elements of Mn and Co adjacent to Fe are observed to be incorporated into the crystal lattice more easily. It is suggested that the doped TMs mainly occupy the iron sites of the intercalated (Li,Fe)OH layers rather than those of the superconducting FeSe layers. We find that the critical current density J c can be enhanced much more strongly by the Mn dopant than the other TMs, while the critical temperature T c is weakly affected by the TM doping.

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Effect of Mn substitution on superconductivity in iron selenide (Li, Fe)OHFeSe single crystals

Cited by 6 publications

References 74 publications

Giant enhancement of critical current density at high field in superconducting (Li,Fe)OHFeSe films by Mn doping

Giant enhancement of critical current density at high field in superconducting (Li,Fe)OHFeSe films by Mn doping

Long-range magnetic order in hydroxide-layer-doped (Li1−x−yFexMnyOD)FeSe

Doping effects of transition metals on the superconductivity of (Li,Fe)OHFeSe films*

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