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PreprintCC BY 4.0arXiv

Raman signatures of a non-reciprocal magnetic phase transition in Ca2RuO4

  • Giacomo Jarc
  • Giovanni Tartaglia
  • Francesco Gabriele
  • Filomena Forte
  • Anita Guarino
  • Angela Montanaro
  • Enrico Maria Rigoni
  • Nitesh Khatiwada
  • Costanza Lincetto
  • Gabriele Bartolini
  • Antonio Mastropasqua
  • Shahla Yasmin Mathengattil
8 more authors
  • Marco Malvestuto
  • Muhammad Waqee Ur Rehman
  • Rosalba Fittipaldi
  • Joachim Deisenhofer
  • Alexander A. Tsirlin
  • Antonio Vecchione
  • Mario Cuoco
  • Daniele Fausti
Open at sourcePDFDOICite

Abstract

The magnetic behavior of Ca2RuO4 represents a unique puzzle due to the interplay of strong electronic correlations, magneto-elastic interactions, and large spin-orbit coupling. At low temperatures, an anomalous Mott insulating state emerges, characterized by a complex antiferromagnetic order with a collective amplitude excitation of the magnetic moment which has been discussed in analogy with the Higgs mode. We report here evidence of a magnetic first-order phase transition driven by an out-of-plane magnetic field along the crystallographic c-axis of Ca2RuO4. Raman measurements in magnetic field reveal the emergence of mode of magnetic origin and a concomitant modification of the coupling between a phonon and the Higgs amplitude mode. Both the Raman features are characterized by a non-reciprocal hysteresis in magnetic field. Surprisingly, the observed phase transition does not affect the Raman scattering from the in-plane magnons, indicating that the dipolar antiferromagnetic order is preserved. This is consistent with the onset of a new quadrupolar field-controlled state, whose fluctuations structure can trigger an hybridization between the lattice and the magnetic Higgs mode resulting in the observed Raman features.

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Cite

BibTeXRIS
BibTeX
@misc{jarc2026raman,
  title = {{Raman signatures of a non-reciprocal magnetic phase transition in Ca$_2$RuO$_4$}},
  author = {Giacomo Jarc and Giovanni Tartaglia and Francesco Gabriele and Filomena Forte and Anita Guarino and Angela Montanaro and Enrico Maria Rigoni and Nitesh Khatiwada and Costanza Lincetto and Gabriele Bartolini and Antonio Mastropasqua and Shahla Yasmin Mathengattil and Marco Malvestuto and Muhammad Waqee Ur Rehman and Rosalba Fittipaldi and Joachim Deisenhofer and Alexander A. Tsirlin and Antonio Vecchione and Mario Cuoco and Daniele Fausti},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.07565},
  eprint = {2609.07565},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.07565},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Raman signatures of a non-reciprocal magnetic phase transition in Ca_2RuO_4
AU  - Giacomo Jarc
AU  - Giovanni Tartaglia
AU  - Francesco Gabriele
AU  - Filomena Forte
AU  - Anita Guarino
AU  - Angela Montanaro
AU  - Enrico Maria Rigoni
AU  - Nitesh Khatiwada
AU  - Costanza Lincetto
AU  - Gabriele Bartolini
AU  - Antonio Mastropasqua
AU  - Shahla Yasmin Mathengattil
AU  - Marco Malvestuto
AU  - Muhammad Waqee Ur Rehman
AU  - Rosalba Fittipaldi
AU  - Joachim Deisenhofer
AU  - Alexander A. Tsirlin
AU  - Antonio Vecchione
AU  - Mario Cuoco
AU  - Daniele Fausti
PY  - 2026
DA  - 2026/09/07
PB  - arXiv
DO  - 10.48550/arxiv.2609.07565
UR  - https://arxiv.org/abs/2609.07565
AB  - The magnetic behavior of Ca_2RuO_4 represents a unique puzzle due to the interplay of strong electronic correlations, magneto-elastic interactions, and large spin-orbit coupling. At low temperatures, an anomalous Mott insulating state emerges, characterized by a complex antiferromagnetic order with a collective amplitude excitation of the magnetic moment which has been discussed in analogy with the Higgs mode. We report here evidence of a magnetic first-order phase transition driven by an out-of-plane magnetic field along the crystallographic c-axis of Ca_2RuO_4. Raman measurements in magnetic field reveal the emergence of mode of magnetic origin and a concomitant modification of the coupling between a phonon and the Higgs amplitude mode. Both the Raman features are characterized by a non-reciprocal hysteresis in magnetic field. Surprisingly, the observed phase transition does not affect the Raman scattering from the in-plane magnons, indicating that the dipolar antiferromagnetic order is preserved. This is consistent with the onset of a new quadrupolar field-controlled state, whose fluctuations structure can trigger an hybridization between the lattice and the magnetic Higgs mode resulting in the observed Raman features.
ER  -