Details

Autor(en) / Beteiligte

• Grinenko, V.
• Sarkar, R.
• Materne, P.
• Kamusella, S.
• Yamamshita, A.
• Takano, Y.
• Sun, Y.
• Tamegai, T.
• Efremov, D. V.
• Drechsler, S.-L.
• Orain, J.-C.
• Goko, T.
• Scheuermann, R.
• Luetkens, H.
• Klauss, H.-H.

Titel

Low-temperature breakdown of antiferromagnetic quantum critical behavior in FeSe

Ist Teil von

• Physical review. B, 2018-05, Vol.97 (20), Article 201102

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2018

Quelle

American Physical Society

Beschreibungen/Notizen

• A nematic transition preceding a long-range spin density wave antiferromagnetic phase is a common feature of many parent compounds of Fe-based superconductors. However, in the FeSe system with a nematic transition at Ts≈90 K, no evidence for long-range static magnetism is found down to very low temperatures. The lack of magnetism is a challenge for the theoretical description of FeSe. We investigated high-quality single crystals of FeSe using high-field (up to 9.5 T) muon spin rotation (μSR) measurements. The μSR Knight shift and the bulk susceptibility linearly scale at high temperatures but deviate from this behavior around T*∼10–20 K, where the Knight shift exhibits a kink. In the temperature range Ts≳T≳T*, the muon spin depolarization rate shows a quantum critical behavior Λ∝T−0.4. The observed critical scaling indicates that FeSe is in the vicinity of an itinerant antiferromagnetic quantum critical point. Below T* the quantum critical behavior breaks down. We argue that this breakdown is caused by a temperature-induced Lifschitz transition.