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UID:DSC-21845
DTSTART;TZID=Europe/Berlin:20250416T110000
SEQUENCE:1744781997
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20250416T120000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/21845
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Ardakani: Interplay of Competing Quantum Phases in Layered Supercon
 ductors: A Multi-Technique Study
CLASS:PUBLIC
DESCRIPTION:Speaker: Vahid Sazgari Ardakani\nInstitute of Speaker: Paul Sch
 errer Institut Villigen\nTopics:\n\n Location:\n  Name: IFW (Zoom\, IFW Dr
 esden)\n  Street: Helmholtzstraße 20\n  City: 01069 Dresden\n  Phone: \n 
  Fax: \nDescription: Understanding the tunability and interplay between va
 rious quantum states such as superconductivity\, charge order\, magnetic o
 rder\, and anomalous transport phenomena in complex quantum materials is c
 entral to condensed matter physics. These intertwined phases not only chal
 lenge our fundamental understanding of electron correlations but also offe
 r pathways for engineering novel quantum functionalities [1\, 2\, 3]. In t
 his seminar\, I will present a multi-technique investigation employing muo
 n spin rotation (µSR) and transport measurements\, combined with uniaxial
  strain and hydrostatic pressure\, to explore competing electronic orders 
 in two distinct layered superconductors. Our study on 6R-TaS2 reveals a co
 mpetition among charge density wave (CDW)\, superconductivity\, and a hidd
 en order phase associated with an anomalous Hall effect and large magnetor
 esistance [4]. Under hydrostatic pressure\, the CDW order is progressively
  suppressed\, with its onset temperature reduced by 50% at 2 GPa\, while s
 uperconductivity is enhanced—transitioning from a nodal to a nodeless pai
 ring state with increasing superfluid density. Notably\, the hidden order 
 phase is highly sensitive to external perturbations indicating its fragile
  nature compared to the CDW state. The suppression of both CDW and hidden 
 order frees electronic states\, reinforcing superconductivity. Similarly\,
  uniaxial strain experiments on La2&amp\;amp\;#8722\;xBaxCuO4 [5] reveal a
 n anisotropic response: c-axis compression suppresses 3D superconductivity
  while preserving spin-stripe order\, whereas in-plane stress enhances sup
 erconductivity and destabilizes stripe order [5\, 6]. This underscores the
  critical role of crystallographic anisotropy in governing quantum phase c
 ompetition in cuprates. These findings highlight the intricate balance bet
 ween superconductivity\, charge order\, and emergent electronic phases in 
 strongly correlated materials. Moreover\, they demonstrate how external tu
 ning parameters—pressure and strain—can be leveraged to manipulate compe
 ting orders\, offering new insights into unconventional superconductivity 
 and the broader design principles for quantum materials. References [1] Z.
  Guguchia et al. Designing the stripe-ordered cuprate phase diagram throug
 h uniaxial-stress. Proceedings of the National Academy of Sciences\, 121(1
 ):e2303423120\, 2024. [2] R. Khasanov\, et.al.\, V. Sazgari\, et al.\, and
  Z. Guguchia. Pressure-enhanced splitting of density wave transitions in L
 a3Ni2O7&amp\;amp\;#8722\;&amp\;amp\;#948\;. Nature Physics\, pages 1–7\, 
 2025. [3] V. Sazgari\, et.al.\, and Z. Guguchia. Pressure-induced enhancem
 ent of superfluid density in transition metal dichalcogenides with and wit
 hout charge density wave. Phys Rev. Res. In Press\, 2025. [4] V. Sazgari\,
  et.al.\, and Z. Guguchia. Competing quantum orders in 6R-TaS2: Unconventi
 onal superconductivity\, charge order\, and an anomalous hall effect phase
 . arXiv:2503.13944\, 2025. [5] SS. Islam\, V. Sazgari\, et al.\, and Z. Gu
 guchia. Contrasting c-axis and in-plane uniaxial stress effects on superco
 nductivity and stripe order in La1.885Ba0.115CuO4. arXiv preprint arXiv:25
 03.09236\, 2025. [6] V. Sazgari\, et al.\, and Z. Guguchia. The effect of 
 in-plane uniaxial stress on superconductivity\, structural transition\, an
 d stripe order in La2&amp\;amp\;#8722\;xBaxCuO4. Under Preparation\, 2025.
DTSTAMP:20261010T080533Z
CREATED:20250327T063705Z
LAST-MODIFIED:20250416T053957Z
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