Synthesis, anisotropy, and superconducting properties of LiFeAs single crystal

Song, Young-Joon; Ghim, Jin Soo; Min, Baehyun; Kwon, Yong Seung; Jung, Myung Hun; Rhyee, Jong‐Soo

doi:10.1063/1.3435472

Cited by 74 publications

(104 citation statements)

References 26 publications

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“…2 (a), the superconducting onset transition was estimated as T onset = 18.2 K. And, the zero resistivity was found to be realized at 17.1 K, resulting in the transition width of 1.1 K. This transition width is smaller than the values reported so far, which ranged from 2 to 4 K [5,6,17,20].…”

Section: Resultsmentioning

confidence: 41%

“…Our experimental γ ~ 2.3 is obviously getting closer to but is still larger than this prediction. It is interesting to note that γ ~ 1.2 was observed in the sample grown by the Bridgeman technique [17], indicating γ can be also sensitive to the crystal growth method.…”

Section: Resultsmentioning

confidence: 99%

“…Even though FeAs self-flux has been reported to work for growing LiFeAs single crystals, a high melting temperature of the FeAs flux ~ 1030 °C, demands an additional technique such as a welding of a metal crucible under high Ar pressure to reduce Li evaporation [16]. A recent report using the Bridgeman technique also employed the welding of a metal crucible to keep Li from evaporation during reaction [17].…”

Section: Introductionmentioning

confidence: 99%

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Single-crystal growth and superconducting properties of LiFeAs

Lee¹,

Khim²,

Kim³

et al. 2010

EPL

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Section: Resultsmentioning

confidence: 41%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single-crystal growth and superconducting properties of LiFeAs

Lee¹,

Khim²,

Kim³

et al. 2010

EPL

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“…19,20) Therefore, LiFeAs provides a unique opportunity to probe the intrinsic properties of Fe-based high-T c superconductivity.…”

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confidence: 99%

Determination of the Upper Critical Field of a Single Crystal LiFeAs: The Magnetic Torque Study up to 35 Tesla

et al. 2011

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We report on the upper critical field B c2 of a superconducting LiFeAs single crystal with T c $ 16 K, determined from magnetic torque measurements in dc-magnetic fields up to 35 T and at temperatures down to 0.3 K. B c2 at 0.3 K is obtained to be 26.4 and 15.5 T for the applied field B a k ab and B a k c, respectively. The anisotropy parameter À ¼ B ab c2 =B c c2 is $3 at T c and decreases to 1.7 as T ! 0, showing rather isotropic superconductivity. While B c2 is orbitally-limited for B a k c, the spin-paramagnetic effect is evident in the temperature dependence of B c2 for B a k ab. KEYWORDS: iron-based superconductor, LiFeAs, upper critical field, anisotropySince the discovery of superconductivity in LaFeAs(O,F) with T c ¼ 26 K, 1) a variety of related compounds containing FeAs-layers has been found to exhibit superconductivity.2)The parent compounds RFeAsO (R = rare earth, ''1111'' system) and AFe 2 As 2 (A = alkaline earth or Eu, ''122'' system) with the ZrCuSiAs-and ThCr 2 Si 2 -type structures, respectively, undergo antiferromagnetic and structural transitions. The transitions can be suppressed by several kinds of doping effects 1,[3][4][5][6] or application of pressure, [7][8][9] and T c reaches $56 K in some compounds. [10][11][12] The magnetic long range order usually competes with superconductivity, but the fluctuation likely plays a crucial role in the pairing mechanism of the Fe-based high-T c systems. It is also of interest that, around the optimal condition where T c shows its maximum, deviation from conventional Fermi-liquid behavior has been observed such as $ T , 13,14) anomalous Hall angle, 13) an enhancement of effective masses, 15) etc. These superconducting and normal-state features bear resemblance with those widely reported for strongly-correlated electron systems including cuprates and heavy fermion compounds.The title compound LiFeAs, categorized as the ''111'' system with the CeFeSi-type structure, has distinctive characteristics: (i) the stoichiometric superconductivity with T c as high as $17 K, 16) (ii) no experimental evidence for the magnetic/structural transitions, 17,18) and (iii) single crystals with high quality (residual resistivity ratio up to 50). 19,20) Therefore, LiFeAs provides a unique opportunity to probe the intrinsic properties of Fe-based high-T c superconductivity.Up to now, there are few reports on systematic measurements of the upper critical field B c2 of Fe-based superconductors to address the issue of the pair-breaking mechanism. This is mainly due to the fact that high-T c superconductors including Fe-based systems generally have extremely high B c2 . In many cases, accordingly, the lowtemperature behavior is extrapolated from the high temperature data around T c , which may lead to misleading conclusions. A precise determination of B c2 over the whole temperature range could provide important clues to the pairbreaking mechanism of high-T c superconductivity.Here, we present the first report on the whole temperature dependence of B c2 and its angular variatio...

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“…The ratio of ρ c /ρ ab (γ ρ ) is~140 and~430 for Na 2 Ti 2 Sb 2 O and Na 2 Ti 2 As 2 O, whereas an anisotropy of less than a factor of 2 for Na 2 Ti 2 Sb 2 O is theoretically suggested [24]. These values of γ ρ are much larger than that of iron arsenide LiFeAs (γ ρ~1 .3-3.3) [29], which has an alikali double layer like Na 2 Ti 2 Pn 2 O. Note that γ ρ -values for iron arsenides with a different blocking layer have also been reported such as γ ρ~1 -6 for AEFe 2 As 2 [30] and γ ρ~2 0-200 for LaFeAsO [31].…”

Section: Physicalmentioning

confidence: 90%

Titanium Pnictide Oxide Superconductors

Yajima

2017

Condensed Matter

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Abstract:In 2012, a novel superconductor BaTi 2 Sb 2 O was found in the layered titanium pnictide oxides ATi 2 Pn 2 O. A related superconductor BaTi 2 Bi 2 O was subsequently discovered in 2013. The structure of these materials consists of alternate stacking of superconducting Ti 2 Pn 2 O layers and Ba blocking layers, which is somewhat similar to high-T c cuprates since the Ti 2 Pn 2 O layer contains an anti-CuO 2 -type Ti 2 O square lattice. In addition to the structural similarity to the well-known high-T c superconductors, BaTi 2 Pn 2 O shows unique physical properties: two superconducting domes appear in the electronic phase diagram for solid solutions of BaTi 2 (Sb 1-x Bi x ) 2 O and a unique density-wave instability which coexists with superconductivity. In this short review, the early studies of titanium pnictide oxides, the discovery of novel superconductors BaTi 2 Pn 2 O, and recent progress are summarized.

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Synthesis, anisotropy, and superconducting properties of LiFeAs single crystal

Cited by 74 publications

References 26 publications

Single-crystal growth and superconducting properties of LiFeAs

Single-crystal growth and superconducting properties of LiFeAs

Determination of the Upper Critical Field of a Single Crystal LiFeAs: The Magnetic Torque Study up to 35 Tesla

Titanium Pnictide Oxide Superconductors

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