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Low-temperature phase diagram of Fe_{1+y}Te studied using x-ray diffraction (2013)

Cevriye Koz, Sahana Rößler, Alexander A. Tsirlin, Steffen Wirth, and Ulrich Schwarz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-19

Description: Author(s): Cevriye Koz, Sahana Rößler, Alexander A. Tsirlin, Steffen Wirth, and Ulrich Schwarz We used low-temperature synchrotron x-ray diffraction to investigate the structural phase transitions of Fe 1+ y Te in the vicinity of a tricitical point in the phase diagram. A detailed analysis of the powder diffraction patterns and temperature dependence of the peak widths in Fe 1+ y Te showed that two... [Phys. Rev. B 88, 094509] Published Wed Sep 18, 2013

Keywords: Superfluidity and superconductivity

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

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Josephson current through a quantum dot coupled to a molecular magnet (2013)

P. Stadler, C. Holmqvist, and W. Belzig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-20

Description: Author(s): P. Stadler, C. Holmqvist, and W. Belzig Josephson currents are carried by sharp Andreev states within the superconducting energy gap. We theoretically study the electronic transport of a magnetically tunable nanoscale junction consisting of a quantum dot connected to two superconducting leads and coupled to the spin of a molecular magnet.... [Phys. Rev. B 88, 104512] Published Thu Sep 19, 2013

Keywords: Superfluidity and superconductivity

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Structural, magnetic, and superconducting properties of Ba_{1−x}Na_{x}Fe_{2}As_{2} (2013)

S. Avci, J. M. Allred, O. Chmaissem, D. Y. Chung, S. Rosenkranz, J. A. Schlueter, H. Claus, A. Daoud-Aladine, D. D. Khalyavin, P. Manuel, A. Llobet, M. R. Suchomel, M. G. Kanatzidis, and R. Osborn

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-21

Description: Author(s): S. Avci, J. M. Allred, O. Chmaissem, D. Y. Chung, S. Rosenkranz, J. A. Schlueter, H. Claus, A. Daoud-Aladine, D. D. Khalyavin, P. Manuel, A. Llobet, M. R. Suchomel, M. G. Kanatzidis, and R. Osborn We report the results of a systematic investigation of the phase diagram of the iron-based superconductor system, Ba 1− x Na x Fe 2 As 2 , from x =0.1 to x =1.0 using high-resolution neutron and x-ray diffraction and magnetization measurements. We find that the coincident structural and magnetic phase transiti... [Phys. Rev. B 88, 094510] Published Fri Sep 20, 2013

Keywords: Superfluidity and superconductivity

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Tradeoff between leakage and dephasing errors in the fluxonium qubit (2013)

David A. Herrera-Martí, Ahsan Nazir, and Sean D. Barrett

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-21

Description: Author(s): David A. Herrera-Martí, Ahsan Nazir, and Sean D. Barrett We present a tradeoff between anharmonicity (related to leakage) and pure dephasing errors for the fluxonium circuit. We show that in the insulating regime, i.e., when the persistent current flowing across the circuit is suppressed, the pure dephasing rate induced by a Markovian environment decrease... [Phys. Rev. B 88, 094512] Published Fri Sep 20, 2013

Keywords: Superfluidity and superconductivity

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Fermiology, orbital order, orbital fluctuations, and Cooper pairing in iron-based superconductors (2013)

Fan Yang, Fa Wang, and Dung-Hai Lee

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-27

Description: Author(s): Fan Yang, Fa Wang, and Dung-Hai Lee We address two important issues that arise in recent studies of iron-based superconductivity. (1) Why are the T c of A x Fe 2− y Se 2 ( A =K, Rb, Cs) and the single unit cell FeSe on SrTiO 3 so high despite both only having electron pockets? (2) What (if any) are the effects of orbital order and orbital fluct... [Phys. Rev. B 88, 100504] Published Thu Sep 26, 2013

Keywords: Superfluidity and superconductivity

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μSR and NMR study of the superconducting Heusler compound YPd_{2}Sn (2013)

H. Saadaoui, T. Shiroka, A. Amato, C. Baines, H. Luetkens, E. Pomjakushina, V. Pomjakushin, J. Mesot, M. Pikulski, and E. Morenzoni

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-27

Description: Author(s): H. Saadaoui, T. Shiroka, A. Amato, C. Baines, H. Luetkens, E. Pomjakushina, V. Pomjakushin, J. Mesot, M. Pikulski, and E. Morenzoni We report on muon-spin rotation and relaxation ( μ SR) and 119 Sn nuclear magnetic resonance (NMR) measurements to study the microscopic superconducting and magnetic properties of the Heusler compound with the highest superconducting transition temperature, YPd 2 Sn ( T c =5.4 K). Measurements in the vortex... [Phys. Rev. B 88, 094518] Published Thu Sep 26, 2013

Keywords: Superfluidity and superconductivity

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Odd-frequency superconducting pairing in multiband superconductors (2013)

Annica M. Black-Schaffer and Alexander V. Balatsky

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-28

Description: Author(s): Annica M. Black-Schaffer and Alexander V. Balatsky We point out that essentially all multiband superconductors have an odd-frequency pairing component, as follows from a general symmetry analysis of even- and odd-frequency pairing states. We show that odd-frequency superconducting pairing requires only a finite band hybridization, or scattering, and... [Phys. Rev. B 88, 104514] Published Fri Sep 27, 2013

Keywords: Superfluidity and superconductivity

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Nodeless versus nodal scenarios of possible triplet superconductivity in the quasi-one-dimensional layered conductor Li_{0.9}Mo_{6}O_{17} (2013)

O. Sepper and A. G. Lebed

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): O. Sepper and A. G. Lebed We consider the problem of the orbital upper critical magnetic field, parallel to the most conducting axis of a quasi-one-dimensional layered superconductor. It is shown that superconductivity can be destroyed through orbital effects at fields much higher than the so-called Clogston-Chandrasekhar pa... [Phys. Rev. B 88, 094520] Published Mon Sep 30, 2013

Keywords: Superfluidity and superconductivity

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Triplet pairing and possible weak topological superconductivity in BiS_{2}-based superconductors (2013)

Yang Yang, Wan-Sheng Wang, Yuan-Yuan Xiang, Zheng-Zao Li, and Qiang-Hua Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): Yang Yang, Wan-Sheng Wang, Yuan-Yuan Xiang, Zheng-Zao Li, and Qiang-Hua Wang We show that the newly discovered BiS 2 -based superconductors may have a dominant triplet pairing component in addition to a subdominant singlet component arising from the spin-orbital coupling. The pairing respects time-reversal symmetry. The dominant triplet gap causes gap sign changes between the ... [Phys. Rev. B 88, 094519] Published Mon Sep 30, 2013

Keywords: Superfluidity and superconductivity

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Superconductivity in (NH_{3})_{y}Cs_{0.4}FeSe (2013)

Lu Zheng, Masanari Izumi, Yusuke Sakai, Ritsuko Eguchi, Hidenori Goto, Yasuhiro Takabayashi, Takashi Kambe, Taiki Onji, Shingo Araki, Tatsuo C. Kobayashi, Jungeun Kim, Akihiko Fujiwara, and Yoshihiro Kubozono

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): Lu Zheng, Masanari Izumi, Yusuke Sakai, Ritsuko Eguchi, Hidenori Goto, Yasuhiro Takabayashi, Takashi Kambe, Taiki Onji, Shingo Araki, Tatsuo C. Kobayashi, Jungeun Kim, Akihiko Fujiwara, and Yoshihiro Kubozono Alkali-metal-intercalated FeSe materials, (NH 3 ) y M 0.4 FeSe ( M : K, Rb, and Cs), have been synthesized using the liquid NH 3 technique. (NH 3 ) y Cs 0.4 FeSe shows a superconducting transition temperature ( T c ) as high as 31.2 K, which is higher by 3.8 K than the T c of nonammoniated Cs 0.4 FeSe. The T c s of (NH 3 ) y ... [Phys. Rev. B 88, 094521] Published Mon Sep 30, 2013

Keywords: Superfluidity and superconductivity

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