Search NASA⌕ Search
Home/Archive/DOE OSTI

DOE OSTI · 3022657

Photoinduced frustration modulation in 𝜅-type quantum spin liquid candidates

Tepie, M. [Harvard University, Cambridge, MA (United States)] (ORCID:0009000832522328)·Glerean, F. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000324996386)·Ovčar, J. [Ruđer Bošković Institute, Zagreb (Croatia)] (ORCID:0009000904258395)·Priya, S. [Universität Stuttgart (Germany)]·Miyagawa, K. [University of Tokyo (Japan)] (ORCID:0000000348417713)·Taniguchi, H. [Saitama University (Japan)] (ORCID:0000000295293672)·Kanoda, K. [Universität Stuttgart (Germany); University of Tokyo, Kashiwa (Japan); Max Planck Institute for Solid State Research, Stuttgart (Germany)] (ORCID:0000000159920125)·Lončarić, I. [Ruđer Bošković Institute, Zagreb (Croatia)] (ORCID:0000000255544641)·Dressel, M. [Universität Stuttgart (Germany)] (ORCID:000000031907052X)·Mitrano, M. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000201020391)
View original source ↗Read source document ↗Export metadata ↓

Abstract

Geometric frustration is a key parameter controlling electronic and magnetic properties of quantum spin liquid systems, yet remains challenging to tune. Here, we coherently drive molecular vibrations with midinfrared pulses in two organic quantum spin liquid candidates, the insulating 𝜅−(BEDT−TTF) 2⁢ Cu 2 ⁢(CN) 3 and the metallic 𝜅−(BEDT−TTF) 4 ⁢Hg 2.89 ⁢Br 8 , and probe their electronic response through ultrafast reflectivity measurements. We observe a nonlinear coupling between local molecular vibrations and nonlocal phonons, which is expected to directly modulate the geometric frustration of their triangular lattice. Furthermore, our findings establish a promising route to dynamically control frustration in nonbipartite quantum materials.

Explore related subjects

Frustrated magnetismOrganic superconductorsQuantum spin liquidUltrafast phenomenaUltrafast pump-probe spectroscopy

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Tepie, M. [Harvard University, Cambridge, MA (United States)] (ORCID:0009000832522328), Glerean, F. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000324996386), Ovčar, J. [Ruđer Bošković Institute, Zagreb (Croatia)] (ORCID:0009000904258395), Priya, S. [Universität Stuttgart (Germany)], Miyagawa, K. [University of Tokyo (Japan)] (ORCID:0000000348417713), Taniguchi, H. [Saitama University (Japan)] (ORCID:0000000295293672), Kanoda, K. [Universität Stuttgart (Germany); University of Tokyo, Kashiwa (Japan); Max Planck Institute for Solid State Research, Stuttgart (Germany)] (ORCID:0000000159920125), Lončarić, I. [Ruđer Bošković Institute, Zagreb (Croatia)] (ORCID:0000000255544641), Dressel, M. [Universität Stuttgart (Germany)] (ORCID:000000031907052X), Mitrano, M. [Harvard University, Cambridge, MA (United States)] (ORCID:0000000201020391). 2025-10-08. Photoinduced frustration modulation in 𝜅-type quantum spin liquid candidates. https://doi.org/10.1103/clxp-z2g5

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2026

Magnetism of single crystalline breathing pyrochlore spinel AgInCr 4 ⁢S 8

Single crystals of Ag⁢In⁢Cr 4⁢ S 8 are grown by chemical vapor transport and crystallographic ordering of Ag/In that results in a breathing pyrochlore motif of Cr 3+ is verified by x-ray and neutron diffraction. Long-range antiferromagnetic order is observed below a Néel temperature of 𝑇 N ≈ 9.6 K. The magnetic properties are characterized using ac and dc magnetization, specific heat capacity, and single crystal neutron diffraction measurements. The specific heat data are characterized by a small lambda anomaly near 9.5 K and the estimated magnetic entropy reaches ≈ $\frac{1}{3}$ of the expected value by 3⁢𝑇 N , suggesting significant short-range order in the paramagnetic phase. Single crystal neutron diffraction evidences an incommensurate spin structure with propagation vector 𝒌 = (0,0,𝛿) and 𝛿 = 0.343 at 5 K. The minimal model that accounts for the data consists of ferromagnetic layers of Cr atoms, with magnetic moments lying in the plane of the layers and modulating in the perpendicular direction to form a helical structure propagating along 𝒌. Furthermore, this study represents a rare investigation of single crystals within the family of breathing pyrochlore materials.

Frustrated magnetism↗
DOE OSTI2025

Collapse of the effective response time near the spin glass transition temperature

Kenning et al. discovered the collapse of the effective response time, 𝑡$^{eff}_{𝐻}$⁡(𝑡 w ;𝑇), independent of aging time, 𝑡 w , as one approached the spin glass transition temperature 𝑇 g from below. Nordblad and Lundgren observed the same effect by reducing the temperature from 𝑇 g ⁡(𝐻). We analyze the behavior of ln⁡ 𝑡$^{eff}_{𝐻}$⁡(𝑡 w ;𝑇) in the temperature range near and below 𝑇 g using a scaling law that takes into account both the magnetic field 𝐻 and the time-dependent spin-glass coherence length 𝜉⁡(𝑡,𝑡 w ;𝑇). As a result, an overdetermined predictive fit to the experimental data accounts for a quasioscillatory structure of ln ⁡𝑡$^{eff}_{𝐻}$⁡ (𝑡 w ;𝑇) as a function of magnetic field 𝐻 2 for reduced temperatures as large as 𝑇/𝑇 g = 0.98.

Frustrated magnetism↗
DOE OSTI2025

Hidden frustration in the triangular-lattice antiferromagnet NdCd 3 ⁢P 3

We report a study of the magnetic ground state and crystal electric field (CEF) scheme in the triangular-lattice antiferromagnet NdCd 3 ⁢P 3 . Combined neutron scattering, magnetization, and heat capacity measurements demonstrate that the Nd 3+ moments occupying the triangular lattice in this material harbor hidden signs of frustration not detected in typical Curie-Weiss-based parametrization of the frustration index (𝑓 = Θ 𝐶⁢𝑊 /𝑇 𝑁 ). This is evidenced by a zero-field splitting of the Kramers' ground state and first excited state doublets at temperatures far in excess of 𝑇 𝑁 as well as signatures of low-energy fluctuations for 𝑇 ≫ 𝑇 𝑁 . As a result, a suppression of the zero-field ordered moment relative to its field saturation value is observed, and the impacts of this magnetic frustration as well as the coexisting bond frustration in the CdP honeycomb network on the physical properties of NdCd 3 ⁢P3 are discussed.

Frustrated magnetism↗