000			03852nam a22004815i 4500
001			978-4-431-54294-0
003			DE-He213
005			20140220082927.0
007			cr nn 008mamaa
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 theory.
650		0	_aMagnetism.
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
999			_c99070 _d99070