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001 sulb-eb0025933
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008 130217s2013 ja | s |||| 0|eng d
020 _a9784431542940
_9978-4-431-54294-0
024 7 _a10.1007/978-4-431-54294-0
_2doi
050 4 _aQC611.9-611.98
072 7 _aTJFD5
_2bicssc
072 7 _aTEC039000
_2bisacsh
072 7 _aSCI021000
_2bisacsh
082 0 4 _a530.41
_223
100 1 _aHashimoto, Kenichiro.
_eauthor.
245 1 0 _aNon-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements
_h[electronic resource] /
_cby Kenichiro Hashimoto.
264 1 _aTokyo :
_bSpringer Japan :
_bImprint: Springer,
_c2013.
300 _aXIII, 125 p. 74 illus., 45 illus. in color.
_bonline resource.
336 _atext
_btxt
_2rdacontent
337 _acomputer
_bc
_2rdamedia
338 _aonline resource
_bcr
_2rdacarrier
347 _atext file
_bPDF
_2rda
490 1 _aSpringer Theses, Recognizing Outstanding Ph.D. Research,
_x2190-5053
505 0 _aIntroduction -- Superconducting Gap Structure and Magnetic Penetration Depth -- Iron-based Superconductors -- Experimental Method -- Superconducting Gap Structure and Quantum Critical Point in BaFe2(As1-xPx)2 -- Superconducting Gap Nodes in the Zone-centered Hole Bands of KFe2As2 -- Nodeless vs. Nodal Order Parameter in LiFeAs and LiFeP -- Conclusions.
520 _aIn this book the author presents two important findings revealed by high-precision magnetic penetration depth measurements in iron-based superconductors which exhibit high-transition temperature superconductivity up to 55 K: one is the fact that the superconducting gap structure in iron-based superconductors depends on a detailed electronic structure of individual materials, and the other is the first strong evidence for the presence of a quantum critical point (QCP) beneath the superconducting dome of iron-based superconductors. The magnetic penetration depth is a powerful probe to elucidate the superconducting gap structure which is intimately related to the pairing mechanism of superconductivity. The author discusses the possible gap structure of individual iron-based superconductors by comparing the gap structure obtained from the penetration depth measurements with theoretical predictions, indicating that the non-universal superconducting gap structure in iron-pnictides can be interpreted in the framework of A1g symmetry. This result imposes a strong constraint on the pairing mechanism of iron-based superconductors. The author also shows clear evidence for the quantum criticality inside the superconducting dome from the absolute zero-temperature penetration depth measurements as a function of chemical composition. A sharp peak of the penetration depth at a certain composition demonstrates pronounced quantum fluctuations associated with the QCP, which separates two distinct superconducting phases. This gives the first convincing signature of a second-order quantum phase transition deep inside the superconducting dome, which may address a key question on the general phase diagram of unconventional superconductivity in the vicinity of a QCP.
650 0 _aPhysics.
650 0 _aQuantum physics.
650 0 _aSuperconductivity.
650 0 _aSuperconductors.
650 0 _aMagnetism.
650 0 _aMagnetic materials.
650 1 4 _aPhysics.
650 2 4 _aStrongly Correlated Systems, Superconductivity.
650 2 4 _aQuantum Physics.
650 2 4 _aMagnetism, Magnetic Materials.
710 2 _aSpringerLink (Online service)
773 0 _tSpringer eBooks
776 0 8 _iPrinted edition:
_z9784431542933
830 0 _aSpringer Theses, Recognizing Outstanding Ph.D. Research,
_x2190-5053
856 4 0 _uhttp://dx.doi.org/10.1007/978-4-431-54294-0
912 _aZDB-2-PHA
942 _2Dewey Decimal Classification
_ceBooks
999 _c48025
_d48025