A.T. Savici
Columbia University
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Featured researches published by A.T. Savici.
Physical Review Letters | 2005
A.T. Savici; A. Fukaya; I. M. Gat-Malureanu; T. Ito; P. L. Russo; Y. J. Uemura; C. R. Wiebe; P. P. Kyriakou; Gregory John MacDougall; M. T. Rovers; G. M. Luke; K. M. Kojima; M. Goto; S. Uchida; Ryosuke Kadono; K. Yamada; S. Tajima; T. Masui; H. Eisaki; N. Kaneko; M. Greven; G. D. Gu
Muon spin relaxation measurements in high transverse magnetic fields [FORMULA: SEE TEXT] revealed strong field-induced quasistatic magnetism in the underdoped and Eu-doped (La,Sr)2CuO4 and La1.875Ba0.125CuO4, existing well above Tc and TN. The susceptibility counterpart of Cu spin polarization, derived from the muon spin relaxation rate, exhibits a divergent behavior towards T approximately 25 K. No field-induced magnetism was detected in overdoped La1.81Sr0.19CuO4, optimally doped Bi2212, and Zn-doped YBa2Cu3O7.
Physical Review Letters | 2003
A. Fukaya; Y. Fudamoto; I.M. Gat; Toshimitsu Ito; M. Larkin; A.T. Savici; Y. J. Uemura; P. P. Kyriakou; G. M. Luke; M. T. Rovers; K. M. Kojima; Amit Keren; M. Hanawa; Zenji Hiroi
Muon spin relaxation and magnetic susceptibility measurements have been performed on the pure and diluted spin 1/2 kagomé system (CuxZn(1-x))3V2O7(OH)2 2H2O. In the pure x=1 system we found a slowing down of Cu spin fluctuations with decreasing temperature towards T approximately 1 K, followed by slow and nearly temperature-independent spin fluctuations persisting down to T=50 mK, indicative of quantum fluctuations. No indication of static spin freezing was detected in either of the pure (x=1.0) or diluted samples. The observed magnitude of fluctuating fields indicates that the slow spin fluctuations represent an intrinsic property of kagomé network rather than impurity spins.
Nature Materials | 2012
J. P. Carlo; Tatsuo Goko; I. M. Gat-Malureanu; P. L. Russo; A.T. Savici; A. A. Aczel; G.J. MacDougall; Jose Rodriguez; T. J. Williams; G. M. Luke; C. R. Wiebe; Yoshiyuki Yoshida; Satoru Nakatsuji; Yoshiteru Maeno; T. Taniguchi; Y. J. Uemura
High-T(c) cuprates, iron pnictides, organic BEDT and TMTSF, alkali-doped C(60), and heavy-fermion systems have superconducting states adjacent to competing states exhibiting static antiferromagnetic or spin density wave order. This feature has promoted pictures for their superconducting pairing mediated by spin fluctuations. Sr(2)RuO(4) is another unconventional superconductor which almost certainly has a p-wave pairing. The absence of known signatures of static magnetism in the Sr-rich side of the (Ca, Sr) substitution space, however, has led to a prevailing view that the superconducting state in Sr(2)RuO(4) emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca)(2)RuO(4) has a ground state with static magnetic order over nearly the entire range of (Ca, Sr) substitution, with spin-glass behaviour in Sr(1.5)Ca(0.5)RuO(4) and Ca(1.5)Sr(0.5)RuO(4). The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr(2)RuO(4) to competing static magnetic order.
Physical Review B | 2004
Ryosuke Kadono; Wataru Higemoto; Akihiro Koda; M. Larkin; G. M. Luke; A.T. Savici; Y. J. Uemura; K. M. Kojima; Tohru Okamoto; T. Kakeshita; S. Uchida; Toshimitsu Ito; Kunihiko Oka; Mitsuaki Takigawa; Masanori Ichioka; Kazushige Machida
The vortex core radius
Physica B-condensed Matter | 2000
A.T. Savici; Y. Fudamoto; I.M. Gat; M. Larkin; Y. J. Uemura; G. M. Luke; Kenji M. Kojima; Young S. Lee; M. A. Kastner; R.J Birgenau
{\ensuremath{\rho}}_{v},
Journal of Physics: Condensed Matter | 2005
C. R. Wiebe; P. L. Russo; A.T. Savici; Y. J. Uemura; G.J. MacDougall; G. M. Luke; S Kuchta; J.E. Greedan
defined as the peak position of the supercurrent around the vortex, has been determined by muon spin rotation measurements in the mixed state of
Physica B-condensed Matter | 2003
G. M. Luke; M. T. Rovers; A. Fukaya; I.M. Gat; M. Larkin; A.T. Savici; Y. J. Uemura; K. M. Kojima; Paul M. Chaikin; I.J. Lee; Michael J. Naughton
{\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}
Physical Review B | 2010
Gregory John MacDougall; A.T. Savici; A. A. Aczel; R. J. Birgeneau; H. S. Kim; S.-J. Kim; T. Ito; Jose Rodriguez; P. L. Russo; Y. J. Uemura; S. Wakimoto; C. R. Wiebe; G. M. Luke
for
Physical Review Letters | 2010
Jose Rodriguez; A. A. Aczel; J. P. Carlo; S. R. Dunsiger; Gregory John MacDougall; P. L. Russo; A.T. Savici; Y. J. Uemura; C. R. Wiebe; G. M. Luke
x=0.13,
Chaos Solitons & Fractals | 2001
Steliana Codreanu; A.T. Savici
0.15, and 0.19. At lower doping